[pim/ktimetracker] /: Make KTimeTracker REUSE compliant

Thiago Sueto null at kde.org
Fri Mar 1 05:44:06 GMT 2024


Git commit 876d4557d88ab32d3c67d9fdcfcf53275d400692 by Thiago Sueto.
Committed on 01/03/2024 at 05:44.
Pushed by thiagosueto into branch 'master'.

Make KTimeTracker REUSE compliant

M  +9    -0    .gitignore
M  +1    -0    .gitlab-ci.yml
M  +4    -0    .kateconfig
A  +16   -0    .reuse/dep5
M  +10   -0    CMakeLists.txt
M  +5    -0    CONTRIBUTING.md
M  +5    -0    ChangeLog.md
A  +26   -0    LICENSES/BSD-3-Clause.txt
A  +311  -0    LICENSES/GPL-2.0-or-later.txt
A  +604  -0    LICENSES/GPL-3.0-only.txt
A  +12   -0    LICENSES/LicenseRef-KDE-Accepted-GPL.txt
M  +5    -0    README.md
M  +3    -0    doc/CMakeLists.txt
M  +7    -1    doc/index.docbook
M  +3    -0    icons/CMakeLists.txt
M  +7    -0    icons/icons.qrc
M  +6    -0    org.kde.ktimetracker.appdata.xml
M  +3    -0    pics/CMakeLists.txt
M  +5    -0    pics/pics.qrc
M  +4    -0    src/CMakeLists.txt
M  +4    -0    src/Messages.sh
M  +5    -20   src/desktoplist.h
M  +5    -20   src/desktoptracker.cpp
M  +5    -20   src/desktoptracker.h
M  +4    -18   src/dialogs/edittimedialog.cpp
M  +4    -18   src/dialogs/edittimedialog.h
M  +5    -20   src/dialogs/exportdialog.cpp
M  +5    -20   src/dialogs/exportdialog.h
M  +7    -0    src/dialogs/exportdialog.ui
M  +5    -20   src/dialogs/historydialog.cpp
M  +5    -20   src/dialogs/historydialog.h
M  +7    -0    src/dialogs/historydialog.ui
M  +4    -18   src/dialogs/taskpropertiesdialog.cpp
M  +4    -18   src/dialogs/taskpropertiesdialog.h
M  +4    -19   src/export/csveventlog.cpp
M  +4    -19   src/export/csveventlog.h
M  +5    -20   src/export/csvhistory.cpp
M  +5    -20   src/export/csvhistory.h
M  +5    -20   src/export/csvtotals.cpp
M  +5    -20   src/export/csvtotals.h
M  +4    -18   src/export/export.cpp
M  +4    -18   src/export/export.h
M  +5    -20   src/export/totalsastext.cpp
M  +5    -20   src/export/totalsastext.h
M  +5    -20   src/file/filecalendar.cpp
M  +5    -20   src/file/filecalendar.h
M  +4    -18   src/file/icalformatkio.cpp
M  +4    -18   src/file/icalformatkio.h
M  +5    -20   src/focusdetector.cpp
M  +5    -20   src/focusdetector.h
M  +5    -20   src/idletimedetector.cpp
M  +5    -20   src/idletimedetector.h
M  +5    -20   src/import/plannerparser.cpp
M  +5    -20   src/import/plannerparser.h
M  +5    -0    src/ktimetracker.qrc
M  +4    -0    src/ktimetrackerui.rc
M  +5    -20   src/ktimetrackerutility.cpp
M  +5    -20   src/ktimetrackerutility.h
M  +5    -20   src/main.cpp
M  +5    -20   src/mainwindow.cpp
M  +5    -20   src/mainwindow.h
M  +4    -18   src/model/event.cpp
M  +4    -18   src/model/event.h
M  +4    -18   src/model/eventsmodel.cpp
M  +4    -18   src/model/eventsmodel.h
M  +4    -18   src/model/projectmodel.cpp
M  +4    -18   src/model/projectmodel.h
M  +5    -20   src/model/task.cpp
M  +5    -20   src/model/task.h
M  +4    -18   src/model/tasksmodel.cpp
M  +4    -18   src/model/tasksmodel.h
M  +4    -18   src/model/tasksmodelitem.cpp
M  +4    -18   src/model/tasksmodelitem.h
M  +6    -0    src/org.kde.ktimetracker.desktop
M  +5    -0    src/org.kde.ktimetracker.ktimetracker.xml
M  +5    -20   src/reportcriteria.h
M  +4    -0    src/settings/cfgbehavior.ui
M  +6    -1    src/settings/cfgdisplay.ui
M  +5    -1    src/settings/cfgstorage.ui
M  +5    -0    src/settings/ktimetracker.kcfg
M  +4    -0    src/settings/ktimetracker.kcfgc
M  +5    -20   src/settings/ktimetrackerconfigdialog.cpp
M  +5    -20   src/settings/ktimetrackerconfigdialog.h
M  +5    -20   src/taskview.cpp
M  +5    -20   src/taskview.h
M  +3    -0    src/tests/CMakeLists.txt
M  +4    -18   src/tests/exportcsvtest.cpp
M  +4    -18   src/tests/formattimetest.cpp
M  +4    -18   src/tests/helpers.cpp
M  +4    -18   src/tests/helpers.h
M  +4    -18   src/tests/plannerparsertest.cpp
M  +4    -18   src/tests/storagetest.cpp
M  +4    -18   src/tests/tasktest.cpp
M  +5    -20   src/timetrackerstorage.cpp
M  +5    -20   src/timetrackerstorage.h
M  +5    -20   src/timetrackerwidget.cpp
M  +5    -20   src/timetrackerwidget.h
M  +5    -20   src/tray.cpp
M  +5    -20   src/tray.h
M  +5    -20   src/treeviewheadercontextmenu.cpp
M  +5    -20   src/treeviewheadercontextmenu.h
M  +4    -18   src/widgets/searchline.cpp
M  +4    -18   src/widgets/searchline.h
M  +4    -18   src/widgets/taskswidget.cpp
M  +4    -18   src/widgets/taskswidget.h
M  +2    -16   test/conftest.py
M  +2    -16   test/fixture/app.py
M  +3    -0    test/requirements.txt
M  +2    -16   test/test_active_tasks.py
M  +2    -16   test/test_benchmark.py
M  +2    -16   test/test_booktime.py
M  +2    -16   test/test_changetime.py
M  +2    -16   test/test_delete.py
M  +2    -16   test/test_import_export.py
M  +2    -16   test/test_refresh_on_change.py
M  +2    -16   test/test_relative_path.py
M  +2    -16   test/test_samename_tasks.py
M  +2    -16   test/test_version.py
M  +2    -16   test/test_webdav.py

https://invent.kde.org/pim/ktimetracker/-/commit/876d4557d88ab32d3c67d9fdcfcf53275d400692

diff --git a/.gitignore b/.gitignore
index ffceebc0..6e3cd270 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,12 @@
+# SPDX-FileCopyrightText: 2010, 2011 Christophe Giboudeaux <cgiboudeaux at gmail.com>
+# SPDX-FileCopyrightText: 2010 Torgny Nyblom <kde at nyblom.org>
+# SPDX-FileCopyrightText: 2011 Allen Winter <allen.winter at kdab.com>
+# SPDX-FileCopyrightText: 2011 Torgny Nyblom <kde at nyblom.org>
+# SPDX-FileCopyrightText: 2013 Montel Laurent <montel at kde.org>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2023 Thiago Sueto <herzenschein at gmail.com>
+# SPDX-License-Identifier: CC0-1.0
+
 *~
 
 *.orig
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e4bd02dc..cb465fb7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,5 +6,6 @@ include:
     file:
       - /gitlab-templates/flatpak.yml
       - /gitlab-templates/linux-qt6.yml
+      - /gitlab-templates/reuse-lint.yml
       #- /gitlab-templates/freebsd-qt6.yml
       #- /gitlab-templates/windows-qt6.yml
diff --git a/.kateconfig b/.kateconfig
index 0d4badbb..97b3da8d 100644
--- a/.kateconfig
+++ b/.kateconfig
@@ -1 +1,5 @@
+// SPDX-FileCopyrightText: 2008 Volker Krause <vkrause at kde.org>
+// SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+// SPDX-License-Identifier: CC0-1.0
+
 // kate: space-indent on; indent-width 4; remove-trailing-space on; remove-trailing-space-save on;
diff --git a/.reuse/dep5 b/.reuse/dep5
new file mode 100644
index 00000000..1790e934
--- /dev/null
+++ b/.reuse/dep5
@@ -0,0 +1,16 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: ktimetracker
+Upstream-Contact: Thiago Masato Costa Sueto <thiago.sueto at kde.org>
+Source: https://invent.kde.org/pim/ktimetracker
+
+Files: .flatpak-manifest.json
+Copyright: 2023 Thiago Masato Costa Sueto <thiago.sueto at kde.org>
+License: CC0-1.0
+
+Files: icons/*.png icons/*.svg
+Copyright: 2014 Uri Herrera <uri_herrera at nitrux.in> and others
+License: LGPL-3.0-only
+
+Files: test/*.ics test/README src/tests/*.ics src/tests/*.planner pics/*.xpm pics/*.gif doc/*.png
+Copyright: 2019 Alexander Potashev <aspotashev at gmail.com>
+License: CC0-1.0
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9784337c..bddaf3c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,13 @@
+# SPDX-FileCopyrightText: 2019, 2022, 2023 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Andreas Sturmlechner <asturm at gentoo.org>
+# SPDX-FileCopyrightText: 2019 Friedrich W. H. Kossebau <kossebau at kde.org>
+# SPDX-FileCopyrightText: 2019 Pino Toscano <pino at kde.org>
+# SPDX-FileCopyrightText: 2022 Christophe Giboudeaux <christophe at krop.fr>
+# SPDX-FileCopyrightText: 2023 Thiago Masato Costa Sueto <thiago.sueto at kde.org>
+# SPDX-FileCopyrightText: 2024 Konstantin Avadov <konstantin.avadov at yahoo.com>
+
+# SPDX-License-Identifier: BSD-3-Clause
+
 cmake_minimum_required(VERSION 3.20)
 set(APP_VERSION_NUMBER "6.0.0")
 project(ktimetracker VERSION ${APP_VERSION_NUMBER})
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4686c384..1b957867 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,3 +1,8 @@
+<!--
+# SPDX-FileCopyrightText: 2024 Thiago Masato Costa Sueto <thiago.sueto at kde.org>
+# SPDX-License-Identifier: CC0-1.0
+-->
+
 # Contributing to KTimeTracker
 
 The source code for KTimeTracker can be found at https://invent.kde.org/pim/ktimetracker
diff --git a/ChangeLog.md b/ChangeLog.md
index d6f713a2..20dc76fe 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: CC0-1.0
+-->
+
 KTimeTracker 5.0 (release date: ?)
 --------
 - Ported to KDE Frameworks 5
diff --git a/LICENSES/BSD-3-Clause.txt b/LICENSES/BSD-3-Clause.txt
new file mode 100644
index 00000000..0741db78
--- /dev/null
+++ b/LICENSES/BSD-3-Clause.txt
@@ -0,0 +1,26 @@
+Copyright (c) <year> <owner>. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
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+1. Redistributions of source code must retain the above copyright notice,
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diff --git a/LICENSES/GPL-2.0-or-later.txt b/LICENSES/GPL-2.0-or-later.txt
new file mode 100644
index 00000000..3b6070fc
--- /dev/null
+++ b/LICENSES/GPL-2.0-or-later.txt
@@ -0,0 +1,311 @@
+GNU GENERAL PUBLIC LICENSE
+Version 2, June 1991
+
+Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+Everyone is permitted to copy and distribute verbatim copies of this license
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+is covered by the GNU Lesser General Public License instead.) You can apply
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+OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
+OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
+OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH
+HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible
+use to the public, the best way to achieve this is to make it free software
+which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach
+them to the start of each source file to most effectively convey the exclusion
+of warranty; and each file should have at least the "copyright" line and a
+pointer to where the full notice is found.
+
+one line to give the program's name and an idea of what it does. Copyright
+(C) yyyy name of author
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
+Street, Fifth Floor, Boston, MA 02110-1301, USA. Also add information on how
+to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this when
+it starts in an interactive mode:
+
+Gnomovision version 69, Copyright (C) year name of author Gnomovision comes
+with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software,
+and you are welcome to redistribute it under certain conditions; type `show
+c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may be
+called something other than `show w' and `show c'; they could even be mouse-clicks
+or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your school,
+if any, to sign a "copyright disclaimer" for the program, if necessary. Here
+is a sample; alter the names:
+
+Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision'
+(which makes passes at compilers) written by James Hacker.
+
+signature of Ty Coon, 1 April 1989 Ty Coon, President of Vice
diff --git a/LICENSES/GPL-3.0-only.txt b/LICENSES/GPL-3.0-only.txt
new file mode 100644
index 00000000..59907711
--- /dev/null
+++ b/LICENSES/GPL-3.0-only.txt
@@ -0,0 +1,604 @@
+GNU GENERAL PUBLIC LICENSE
+Version 3, 29 June 2007
+
+Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this license
+document, but changing it is not allowed.
+
+Preamble
+
+The GNU General Public License is a free, copyleft license for software and
+other kinds of works.
+
+The licenses for most software and other practical works are designed to take
+away your freedom to share and change the works. By contrast, the GNU General
+Public License is intended to guarantee your freedom to share and change all
+versions of a program--to make sure it remains free software for all its users.
+We, the Free Software Foundation, use the GNU General Public License for most
+of our software; it applies also to any other work released this way by its
+authors. You can apply it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not price. Our
+General Public Licenses are designed to make sure that you have the freedom
+to distribute copies of free software (and charge for them if you wish), that
+you receive source code or can get it if you want it, that you can change
+the software or use pieces of it in new free programs, and that you know you
+can do these things.
+
+To protect your rights, we need to prevent others from denying you these rights
+or asking you to surrender the rights. Therefore, you have certain responsibilities
+if you distribute copies of the software, or if you modify it: responsibilities
+to respect the freedom of others.
+
+For example, if you distribute copies of such a program, whether gratis or
+for a fee, you must pass on to the recipients the same freedoms that you received.
+You must make sure that they, too, receive or can get the source code. And
+you must show them these terms so they know their rights.
+
+Developers that use the GNU GPL protect your rights with two steps: (1) assert
+copyright on the software, and (2) offer you this License giving you legal
+permission to copy, distribute and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains that
+there is no warranty for this free software. For both users' and authors'
+sake, the GPL requires that modified versions be marked as changed, so that
+their problems will not be attributed erroneously to authors of previous versions.
+
+Some devices are designed to deny users access to install or run modified
+versions of the software inside them, although the manufacturer can do so.
+This is fundamentally incompatible with the aim of protecting users' freedom
+to change the software. The systematic pattern of such abuse occurs in the
+area of products for individuals to use, which is precisely where it is most
+unacceptable. Therefore, we have designed this version of the GPL to prohibit
+the practice for those products. If such problems arise substantially in other
+domains, we stand ready to extend this provision to those domains in future
+versions of the GPL, as needed to protect the freedom of users.
+
+Finally, every program is threatened constantly by software patents. States
+should not allow patents to restrict development and use of software on general-purpose
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+patents applied to a free program could make it effectively proprietary. To
+prevent this, the GPL assures that patents cannot be used to render the program
+non-free.
+
+The precise terms and conditions for copying, distribution and modification
+follow.
+
+TERMS AND CONDITIONS
+
+0. Definitions.
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+“This License” refers to version 3 of the GNU General Public License.
+
+“Copyright” also means copyright-like laws that apply to other kinds of works,
+such as semiconductor masks.
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+“The Program” refers to any copyrightable work licensed under this License.
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+To “propagate” a work means to do anything with it that, without permission,
+would make you directly or secondarily liable for infringement under applicable
+copyright law, except executing it on a computer or modifying a private copy.
+Propagation includes copying, distribution (with or without modification),
+making available to the public, and in some countries other activities as
+well.
+
+To “convey” a work means any kind of propagation that enables other parties
+to make or receive copies. Mere interaction with a user through a computer
+network, with no transfer of a copy, is not conveying.
+
+An interactive user interface displays “Appropriate Legal Notices” to the
+extent that it includes a convenient and prominently visible feature that
+(1) displays an appropriate copyright notice, and (2) tells the user that
+there is no warranty for the work (except to the extent that warranties are
+provided), that licensees may convey the work under this License, and how
+to view a copy of this License. If the interface presents a list of user commands
+or options, such as a menu, a prominent item in the list meets this criterion.
+
+1. Source Code.
+The “source code” for a work means the preferred form of the work for making
+modifications to it. “Object code” means any non-source form of a work.
+
+A “Standard Interface” means an interface that either is an official standard
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+The “System Libraries” of an executable work include anything, other than
+the work as a whole, that (a) is included in the normal form of packaging
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+the work, or an object code interpreter used to run it.
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+The “Corresponding Source” for a work in object code form means all the source
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+those activities but which are not part of the work. For example, Corresponding
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+subprograms that the work is specifically designed to require, such as by
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+
+The Corresponding Source need not include anything that users can regenerate
+automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same work.
+
+2. Basic Permissions.
+All rights granted under this License are granted for the term of copyright
+on the Program, and are irrevocable provided the stated conditions are met.
+This License explicitly affirms your unlimited permission to run the unmodified
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+
+You may make, run and propagate covered works that you do not convey, without
+conditions so long as your license otherwise remains in force. You may convey
+covered works to others for the sole purpose of having them make modifications
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+provided that you comply with the terms of this License in conveying all material
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+works for you must do so exclusively on your behalf, under your direction
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+Conveying under any other circumstances is permitted solely under the conditions
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+3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+No covered work shall be deemed part of an effective technological measure
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+copyright treaty adopted on 20 December 1996, or similar laws prohibiting
+or restricting circumvention of such measures.
+
+When you convey a covered work, you waive any legal power to forbid circumvention
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+you disclaim any intention to limit operation or modification of the work
+as a means of enforcing, against the work's users, your or third parties'
+legal rights to forbid circumvention of technological measures.
+
+4. Conveying Verbatim Copies.
+You may convey verbatim copies of the Program's source code as you receive
+it, in any medium, provided that you conspicuously and appropriately publish
+on each copy an appropriate copyright notice; keep intact all notices stating
+that this License and any non-permissive terms added in accord with section
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+and give all recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey, and you
+may offer support or warranty protection for a fee.
+
+5. Conveying Modified Source Versions.
+You may convey a work based on the Program, or the modifications to produce
+it from the Program, in the form of source code under the terms of section
+4, provided that you also meet all of these conditions:
+
+a) The work must carry prominent notices stating that you modified it, and
+giving a relevant date.
+
+b) The work must carry prominent notices stating that it is released under
+this License and any conditions added under section 7. This requirement modifies
+the requirement in section 4 to “keep intact all notices”.
+
+c) You must license the entire work, as a whole, under this License to anyone
+who comes into possession of a copy. This License will therefore apply, along
+with any applicable section 7 additional terms, to the whole of the work,
+and all its parts, regardless of how they are packaged. This License gives
+no permission to license the work in any other way, but it does not invalidate
+such permission if you have separately received it.
+
+d) If the work has interactive user interfaces, each must display Appropriate
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+not display Appropriate Legal Notices, your work need not make them do so.
+
+A compilation of a covered work with other separate and independent works,
+which are not by their nature extensions of the covered work, and which are
+not combined with it such as to form a larger program, in or on a volume of
+a storage or distribution medium, is called an “aggregate” if the compilation
+and its resulting copyright are not used to limit the access or legal rights
+of the compilation's users beyond what the individual works permit. Inclusion
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+the other parts of the aggregate.
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+6. Conveying Non-Source Forms.
+You may convey a covered work in object code form under the terms of sections
+4 and 5, provided that you also convey the machine-readable Corresponding
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+a) Convey the object code in, or embodied in, a physical product (including
+a physical distribution medium), accompanied by the Corresponding Source fixed
+on a durable physical medium customarily used for software interchange.
+
+b) Convey the object code in, or embodied in, a physical product (including
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+either (1) a copy of the Corresponding Source for all the software in the
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+used for software interchange, for a price no more than your reasonable cost
+of physically performing this conveying of source, or (2) access to copy the
+Corresponding Source from a network server at no charge.
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+c) Convey individual copies of the object code with a copy of the written
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+with such an offer, in accord with subsection 6b.
+
+d) Convey the object code by offering access from a designated place (gratis
+or for a charge), and offer equivalent access to the Corresponding Source
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+require recipients to copy the Corresponding Source along with the object
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+Source may be on a different server (operated by you or a third party) that
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+e) Convey the object code using peer-to-peer transmission, provided you inform
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+
+A separable portion of the object code, whose source code is excluded from
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+
+A “User Product” is either (1) a “consumer product”, which means any tangible
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+“Installation Information” for a User Product means any methods, procedures,
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+If you convey an object code work under this section in, or with, or specifically
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+an implementation available to the public in source code form), and must require
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+
+7. Additional Terms.
+“Additional permissions” are terms that supplement the terms of this License
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+that are applicable to the entire Program shall be treated as though they
+were included in this License, to the extent that they are valid under applicable
+law. If additional permissions apply only to part of the Program, that part
+may be used separately under those permissions, but the entire Program remains
+governed by this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option remove any
+additional permissions from that copy, or from any part of it. (Additional
+permissions may be written to require their own removal in certain cases when
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+material) supplement the terms of this License with terms:
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+a) Disclaiming warranty or limiting liability differently from the terms of
+sections 15 and 16 of this License; or
+
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+and will automatically terminate your rights under this License (including
+any patent licenses granted under the third paragraph of section 11).
+
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+not qualify to receive new licenses for the same material under section 10.
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+
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+Each time you convey a covered work, the recipient automatically receives
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+this License, and you may not initiate litigation (including a cross-claim
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+by making, using, selling, offering for sale, or importing the Program or
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+
+11. Patents.
+A “contributor” is a copyright holder who authorizes use under this License
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+
+A contributor's “essential patent claims” are all patent claims owned or controlled
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+of charge and under the terms of this License, through a publicly available
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+cause the Corresponding Source to be so available, or (2) arrange to deprive
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+the covered work in a country, or your recipient's use of the covered work
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+
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+to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting any implied
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+to you under applicable patent law.
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+12. No Surrender of Others' Freedom.
+If conditions are imposed on you (whether by court order, agreement or otherwise)
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+
+13. Use with the GNU Affero General Public License.
+Notwithstanding any other provision of this License, you have permission to
+link or combine any covered work with a work licensed under version 3 of the
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+14. Revised Versions of this License.
+The Free Software Foundation may publish revised and/or new versions of the
+GNU General Public License from time to time. Such new versions will be similar
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+Each version is given a distinguishing version number. If the Program specifies
+that a certain numbered version of the GNU General Public License “or any
+later version” applies to it, you have the option of following the terms and
+conditions either of that numbered version or of any later version published
+by the Free Software Foundation. If the Program does not specify a version
+number of the GNU General Public License, you may choose any version ever
+published by the Free Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions of
+the GNU General Public License can be used, that proxy's public statement
+of acceptance of a version permanently authorizes you to choose that version
+for the Program.
+
+Later license versions may give you additional or different permissions. However,
+no additional obligations are imposed on any author or copyright holder as
+a result of your choosing to follow a later version.
+
+15. Disclaimer of Warranty.
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
+LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
+OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER
+EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM
+PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+16. Limitation of Liability.
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL
+ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM
+AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
+INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO
+USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
+INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
+PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+17. Interpretation of Sections 15 and 16.
+If the disclaimer of warranty and limitation of liability provided above cannot
+be given local legal effect according to their terms, reviewing courts shall
+apply local law that most closely approximates an absolute waiver of all civil
+liability in connection with the Program, unless a warranty or assumption
+of liability accompanies a copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest possible
+use to the public, the best way to achieve this is to make it free software
+which everyone can redistribute and change under these terms.
+
+To do so, attach the following notices to the program. It is safest to attach
+them to the start of each source file to most effectively state the exclusion
+of warranty; and each file should have at least the “copyright” line and a
+pointer to where the full notice is found.
+
+     <one line to give the program's name and a brief idea of what it does.>
+     Copyright (C) <year>  <name of author>
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program does terminal interaction, make it output a short notice like
+this when it starts in an interactive mode:
+
+     <program>  Copyright (C) <year>  <name of author>
+     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+This is free software, and you are welcome to redistribute it under certain
+conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands might
+be different; for a GUI interface, you would use an “about box”.
+
+You should also get your employer (if you work as a programmer) or school,
+if any, to sign a “copyright disclaimer” for the program, if necessary. For
+more information on this, and how to apply and follow the GNU GPL, see <http://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General Public
+License instead of this License. But first, please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/LICENSES/LicenseRef-KDE-Accepted-GPL.txt b/LICENSES/LicenseRef-KDE-Accepted-GPL.txt
new file mode 100644
index 00000000..60a2dffc
--- /dev/null
+++ b/LICENSES/LicenseRef-KDE-Accepted-GPL.txt
@@ -0,0 +1,12 @@
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 3 of
+the license or (at your option) at any later version that is
+accepted by the membership of KDE e.V. (or its successor
+approved by the membership of KDE e.V.), which shall act as a
+proxy as defined in Section 14 of version 3 of the license.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
diff --git a/README.md b/README.md
index 9ba2ae96..5509b406 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
+<!--
+# SPDX-FileCopyrightText: 2021 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2024 Thiago Masato Costa Sueto <thiago.sueto at kde.org>
+# SPDX-License-Identifier: CC0-1.0
+-->
 
 # KTimeTracker
 
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 5911e06f..c51a6d82 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -1,2 +1,5 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Pino Toscano <pino at kde.org>
+# SPDX-License-Identifier: BSD-3-Clause
 kdoctools_create_handbook(index.docbook INSTALL_DESTINATION ${KDE_INSTALL_DOCBUNDLEDIR}/en SUBDIR ktimetracker)
 ########### install files ###############
diff --git a/doc/index.docbook b/doc/index.docbook
index 7950428b..1f1e9fd2 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -5,7 +5,13 @@
   <!ENTITY % English "INCLUDE" > <!-- change language only here -->
   <!ENTITY % addindex "IGNORE">
 ]>
-
+<!--
+SPDX-FileCopyrightText: 2000-2004 Jonathan Singer
+SPDX-FileCopyrightText: 2004-2005 Mark Bucciarelli <mark at hubcapconsulting.com>
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2019 Pino Toscano <pino at kde.org>
+SPDX-License-Identifier: GFDL-1.2-only
+-->
 <book id="ktimetracker" lang="&language;">
 
 <bookinfo id="ktimetrackerinfo">
diff --git a/icons/CMakeLists.txt b/icons/CMakeLists.txt
index 03ead738..53a88cfe 100644
--- a/icons/CMakeLists.txt
+++ b/icons/CMakeLists.txt
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: BSD-3-Clause
+
 qt_add_resources(icons_SRCS icons.qrc)
 add_library(icons OBJECT ${icons_SRCS})
 
diff --git a/icons/icons.qrc b/icons/icons.qrc
index 32c10cb9..4a571b9a 100644
--- a/icons/icons.qrc
+++ b/icons/icons.qrc
@@ -1,3 +1,10 @@
+<!--
+SPDX-FileCopyrightText: 2019, 2021 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2022 Jens Küspert <jens.kuespert at gmx.de>
+
+SPDX-License-Identifier: CC0-1.0
+-->
+
 <!DOCTYPE RCC><RCC version="1.0">
     <qresource prefix="/icons/breeze">
         <file alias="22x22/apps/ktimetracker.svg">breeze/22-apps-ktimetracker.svg</file>
diff --git a/org.kde.ktimetracker.appdata.xml b/org.kde.ktimetracker.appdata.xml
index 8fcc8cc0..742fceb9 100644
--- a/org.kde.ktimetracker.appdata.xml
+++ b/org.kde.ktimetracker.appdata.xml
@@ -1,4 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+SPDX-FileCopyrightText: 2019, 2021 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2022 Matthias Mailänder <matthias at mailaender.name>
+
+SPDX-License-Identifier: CC0-1.0
+-->
 <component type="desktop">
   <id>org.kde.ktimetracker.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
diff --git a/pics/CMakeLists.txt b/pics/CMakeLists.txt
index 2af5b58a..0032a782 100644
--- a/pics/CMakeLists.txt
+++ b/pics/CMakeLists.txt
@@ -1,2 +1,5 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: BSD-3-Clause
+
 qt_add_resources(pics_SRCS pics.qrc)
 add_library(pics OBJECT ${pics_SRCS})
diff --git a/pics/pics.qrc b/pics/pics.qrc
index 42db1d94..45caa66c 100644
--- a/pics/pics.qrc
+++ b/pics/pics.qrc
@@ -1,3 +1,8 @@
+<!--
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
 <!DOCTYPE RCC><RCC version="1.0">
     <qresource prefix="/pics">
         <file>watch.gif</file>
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a77f45c2..2746c253 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+# SPDX-License-Identifier: BSD-3-Clause
+
 set(ktimetracker_SRCS
     dialogs/edittimedialog.cpp
     dialogs/taskpropertiesdialog.cpp
diff --git a/src/Messages.sh b/src/Messages.sh
index cca7431d..c97ff15d 100644
--- a/src/Messages.sh
+++ b/src/Messages.sh
@@ -1,5 +1,9 @@
 #!/bin/sh
 
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Pino Toscano <pino at kde.org>
+# SPDX-License-Identifier: CC0-1.0
+
 $EXTRACTRC `find . -name \*.ui` >> rc.cpp
 $EXTRACTRC `find . -name \*.rc` >> rc.cpp
 $EXTRACTRC `find . -name \*.kcfg` >> rc.cpp
diff --git a/src/desktoplist.h b/src/desktoplist.h
index 97386dbc..19b4ba33 100644
--- a/src/desktoplist.h
+++ b/src/desktoplist.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Tomas Pospisek <tpo at sourcepole.ch>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Tomas Pospisek <tpo at sourcepole.ch>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_DESKTOP_LIST_H
 #define KTIMETRACKER_DESKTOP_LIST_H
diff --git a/src/desktoptracker.cpp b/src/desktoptracker.cpp
index b8c1afaa..431e4767 100644
--- a/src/desktoptracker.cpp
+++ b/src/desktoptracker.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Tomas Pospisek <tpo at sourcepole.ch>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Tomas Pospisek <tpo at sourcepole.ch>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "desktoptracker.h"
 
diff --git a/src/desktoptracker.h b/src/desktoptracker.h
index 69427810..51819ed9 100644
--- a/src/desktoptracker.h
+++ b/src/desktoptracker.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Tomas Pospisek <tpo at sourcepole.ch>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Tomas Pospisek <tpo at sourcepole.ch>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_DESKTOP_TRACKER_H
 #define KTIMETRACKER_DESKTOP_TRACKER_H
diff --git a/src/dialogs/edittimedialog.cpp b/src/dialogs/edittimedialog.cpp
index 836670eb..72fedbe2 100644
--- a/src/dialogs/edittimedialog.cpp
+++ b/src/dialogs/edittimedialog.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "edittimedialog.h"
 
diff --git a/src/dialogs/edittimedialog.h b/src/dialogs/edittimedialog.h
index 2af07634..7d122faa 100644
--- a/src/dialogs/edittimedialog.h
+++ b/src/dialogs/edittimedialog.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_EDITTIMEDIALOG_H
 #define KTIMETRACKER_EDITTIMEDIALOG_H
diff --git a/src/dialogs/exportdialog.cpp b/src/dialogs/exportdialog.cpp
index 2afeb7f2..dffef882 100644
--- a/src/dialogs/exportdialog.cpp
+++ b/src/dialogs/exportdialog.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2004 by Mark Bucciarelli <mark at hubcapconsulting.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2004 Mark Bucciarelli <mark at hubcapconsulting.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "exportdialog.h"
 
diff --git a/src/dialogs/exportdialog.h b/src/dialogs/exportdialog.h
index 614f8f28..e7737455 100644
--- a/src/dialogs/exportdialog.h
+++ b/src/dialogs/exportdialog.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2004 by Mark Bucciarelli <mark at hubcapconsulting.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2004 Mark Bucciarelli <mark at hubcapconsulting.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXPORTDIALOG_H
 #define EXPORTDIALOG_H
diff --git a/src/dialogs/exportdialog.ui b/src/dialogs/exportdialog.ui
index dbfac794..f7bd066b 100644
--- a/src/dialogs/exportdialog.ui
+++ b/src/dialogs/exportdialog.ui
@@ -1,4 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+SPDX-FileCopyrightText: 2004 Mark Bucciarelli <mark at hubcapconsulting.com>
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
 <ui version="4.0">
  <class>ExportDialog</class>
  <widget class="QDialog" name="ExportDialog">
diff --git a/src/dialogs/historydialog.cpp b/src/dialogs/historydialog.cpp
index 4b64332d..9c509347 100644
--- a/src/dialogs/historydialog.cpp
+++ b/src/dialogs/historydialog.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Thorsten Staerk and Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Thorsten Staerk and Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "historydialog.h"
 
diff --git a/src/dialogs/historydialog.h b/src/dialogs/historydialog.h
index cfcf4328..4af4a663 100644
--- a/src/dialogs/historydialog.h
+++ b/src/dialogs/historydialog.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2009 by Thorsten Staerk and Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2009 Thorsten Staerk and Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef HISTORYDIALOG_H
 #define HISTORYDIALOG_H
diff --git a/src/dialogs/historydialog.ui b/src/dialogs/historydialog.ui
index 1e1912a1..146cd8e0 100644
--- a/src/dialogs/historydialog.ui
+++ b/src/dialogs/historydialog.ui
@@ -1,4 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+SPDX-FileCopyrightText: 2009 Thorsten Staerk and Mathias Soeken <msoeken at tzi.de>
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
 <ui version="4.0">
  <class>HistoryDialog</class>
  <widget class="QDialog" name="HistoryDialog">
diff --git a/src/dialogs/taskpropertiesdialog.cpp b/src/dialogs/taskpropertiesdialog.cpp
index 4e1b0830..3f83cf50 100644
--- a/src/dialogs/taskpropertiesdialog.cpp
+++ b/src/dialogs/taskpropertiesdialog.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "taskpropertiesdialog.h"
 
diff --git a/src/dialogs/taskpropertiesdialog.h b/src/dialogs/taskpropertiesdialog.h
index d6b6333c..65ccc627 100644
--- a/src/dialogs/taskpropertiesdialog.h
+++ b/src/dialogs/taskpropertiesdialog.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_TASKPROPERTIESDIALOG_H
 #define KTIMETRACKER_TASKPROPERTIESDIALOG_H
diff --git a/src/export/csveventlog.cpp b/src/export/csveventlog.cpp
index 42ede8ee..8368d842 100644
--- a/src/export/csveventlog.cpp
+++ b/src/export/csveventlog.cpp
@@ -1,23 +1,8 @@
 /*
- * Copyright (C) 2021 David Stächele <david at daiwai.de>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "csveventlog.h"
 
diff --git a/src/export/csveventlog.h b/src/export/csveventlog.h
index 655bd3ba..9c4484e8 100644
--- a/src/export/csveventlog.h
+++ b/src/export/csveventlog.h
@@ -1,23 +1,8 @@
 /*
- * Copyright (C) 2021 David Stächele <david at daiwai.de>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_CSVEVENTLOG_H
 #define KTIMETRACKER_CSVEVENTLOG_H
diff --git a/src/export/csvhistory.cpp b/src/export/csvhistory.cpp
index de15068a..5bdedf3b 100644
--- a/src/export/csvhistory.cpp
+++ b/src/export/csvhistory.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003, 2004 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003, 2004 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "csvhistory.h"
 
diff --git a/src/export/csvhistory.h b/src/export/csvhistory.h
index 7ea95b0d..0e6b9570 100644
--- a/src/export/csvhistory.h
+++ b/src/export/csvhistory.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003, 2004 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003, 2004 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_CSVHISTORY_H
 #define KTIMETRACKER_CSVHISTORY_H
diff --git a/src/export/csvtotals.cpp b/src/export/csvtotals.cpp
index 6dd14a77..84c41768 100644
--- a/src/export/csvtotals.cpp
+++ b/src/export/csvtotals.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "csvtotals.h"
 
diff --git a/src/export/csvtotals.h b/src/export/csvtotals.h
index 80f17316..3d41df57 100644
--- a/src/export/csvtotals.h
+++ b/src/export/csvtotals.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_CSVTOTALS_H
 #define KTIMETRACKER_CSVTOTALS_H
diff --git a/src/export/export.cpp b/src/export/export.cpp
index c401ea07..f8fd6421 100644
--- a/src/export/export.cpp
+++ b/src/export/export.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "export.h"
 
diff --git a/src/export/export.h b/src/export/export.h
index e7862b2c..fc56808f 100644
--- a/src/export/export.h
+++ b/src/export/export.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_EXPORT_H
 #define KTIMETRACKER_EXPORT_H
diff --git a/src/export/totalsastext.cpp b/src/export/totalsastext.cpp
index c0e08dad..e4972ae8 100644
--- a/src/export/totalsastext.cpp
+++ b/src/export/totalsastext.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "totalsastext.h"
 
diff --git a/src/export/totalsastext.h b/src/export/totalsastext.h
index ac968e58..18b0f86c 100644
--- a/src/export/totalsastext.h
+++ b/src/export/totalsastext.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_TOTALSASTEXT_H
 #define KTIMETRACKER_TOTALSASTEXT_H
diff --git a/src/file/filecalendar.cpp b/src/file/filecalendar.cpp
index 267d2c8f..b7c95f3a 100644
--- a/src/file/filecalendar.cpp
+++ b/src/file/filecalendar.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2012 by Sérgio Martins <iamsergio at gmail.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2012 Sérgio Martins <iamsergio at gmail.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "filecalendar.h"
 
diff --git a/src/file/filecalendar.h b/src/file/filecalendar.h
index 14a7e3d7..8f2a4759 100644
--- a/src/file/filecalendar.h
+++ b/src/file/filecalendar.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2012 by Sérgio Martins <iamsergio at gmail.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2012 Sérgio Martins <iamsergio at gmail.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_FILECALENDAR_H
 #define KTIMETRACKER_FILECALENDAR_H
diff --git a/src/file/icalformatkio.cpp b/src/file/icalformatkio.cpp
index ceba3d0d..147af9cf 100644
--- a/src/file/icalformatkio.cpp
+++ b/src/file/icalformatkio.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "icalformatkio.h"
 
diff --git a/src/file/icalformatkio.h b/src/file/icalformatkio.h
index 1396b41c..b54e1ce5 100644
--- a/src/file/icalformatkio.h
+++ b/src/file/icalformatkio.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_ICALFORMATKIO_H
 #define KTIMETRACKER_ICALFORMATKIO_H
diff --git a/src/focusdetector.cpp b/src/focusdetector.cpp
index 5bd9c07f..8e5fe8b4 100644
--- a/src/focusdetector.cpp
+++ b/src/focusdetector.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by René Mérou <ochominutosdearco at gmail.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 René Mérou <ochominutosdearco at gmail.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "focusdetector.h"
 
diff --git a/src/focusdetector.h b/src/focusdetector.h
index 141a80cd..06e05df1 100644
--- a/src/focusdetector.h
+++ b/src/focusdetector.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by René Mérou <ochominutosdearco at gmail.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 René Mérou <ochominutosdearco at gmail.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_FOCUS_DETECTOR_H
 #define KTIMETRACKER_FOCUS_DETECTOR_H
diff --git a/src/idletimedetector.cpp b/src/idletimedetector.cpp
index 14821d1c..a5703037 100644
--- a/src/idletimedetector.cpp
+++ b/src/idletimedetector.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "idletimedetector.h"
 
diff --git a/src/idletimedetector.h b/src/idletimedetector.h
index 1b337983..8f53e130 100644
--- a/src/idletimedetector.h
+++ b/src/idletimedetector.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_IDLE_TIME_DETECTOR_H
 #define KTIMETRACKER_IDLE_TIME_DETECTOR_H
diff --git a/src/import/plannerparser.cpp b/src/import/plannerparser.cpp
index d7ab81bb..66167b6c 100644
--- a/src/import/plannerparser.cpp
+++ b/src/import/plannerparser.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2004 by Thorsten Staerk <dev at staerk.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2004 Thorsten Staerk <dev at staerk.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 /*
 
diff --git a/src/import/plannerparser.h b/src/import/plannerparser.h
index 74d1d0b8..a3f9e4d3 100644
--- a/src/import/plannerparser.h
+++ b/src/import/plannerparser.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2004 by Thorsten Staerk <dev at staerk.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2004 Thorsten Staerk <dev at staerk.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef PLANNERPARSER_H
 #define PLANNERPARSER_H
diff --git a/src/ktimetracker.qrc b/src/ktimetracker.qrc
index 8914c45c..b7d04a2a 100644
--- a/src/ktimetracker.qrc
+++ b/src/ktimetracker.qrc
@@ -1,3 +1,8 @@
+<!--
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: GPL-2.0-or-later
+-->
+
 <RCC>
     <qresource prefix="/kxmlgui5/ktimetracker">
         <file>ktimetrackerui.rc</file>
diff --git a/src/ktimetrackerui.rc b/src/ktimetrackerui.rc
index 7dc7b404..dd770dd2 100644
--- a/src/ktimetrackerui.rc
+++ b/src/ktimetrackerui.rc
@@ -1,4 +1,8 @@
 <!DOCTYPE kpartgui SYSTEM "kpartgui.dtd">
+<!--
+SPDX-FileCopyrightText: 2019, 2022 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
 <gui name="ktimetracker" version="393">
     <MenuBar>
         <Menu name="file">
diff --git a/src/ktimetrackerutility.cpp b/src/ktimetrackerutility.cpp
index 9d26cc06..6faa9364 100644
--- a/src/ktimetrackerutility.cpp
+++ b/src/ktimetrackerutility.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Thorsten Staerk <dev at staerk.de>
- * Copyright (C) 2019, 2021  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Thorsten Staerk <dev at staerk.de>
+    SPDX-FileCopyrightText: 2019, 2021 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ktimetrackerutility.h"
 
diff --git a/src/ktimetrackerutility.h b/src/ktimetrackerutility.h
index de051912..d35a5ba8 100644
--- a/src/ktimetrackerutility.h
+++ b/src/ktimetrackerutility.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Thorsten Staerk <dev at staerk.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Thorsten Staerk <dev at staerk.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKERUTILITY_H
 #define KTIMETRACKERUTILITY_H
diff --git a/src/main.cpp b/src/main.cpp
index 516c3423..cf1ae931 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 1997 by Stephan Kulow <coolo at kde.org>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 1997 Stephan Kulow <coolo at kde.org>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include <QApplication>
 #include <QCommandLineOption>
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index f16bbf39..f21ef4cc 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "mainwindow.h"
 
diff --git a/src/mainwindow.h b/src/mainwindow.h
index 079dab56..1236e4e8 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_MAIN_WINDOW_H
 #define KTIMETRACKER_MAIN_WINDOW_H
diff --git a/src/model/event.cpp b/src/model/event.cpp
index ce515553..3301e9bf 100644
--- a/src/model/event.cpp
+++ b/src/model/event.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "event.h"
 
diff --git a/src/model/event.h b/src/model/event.h
index a3928831..1595f702 100644
--- a/src/model/event.h
+++ b/src/model/event.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_EVENT_H
 #define KTIMETRACKER_EVENT_H
diff --git a/src/model/eventsmodel.cpp b/src/model/eventsmodel.cpp
index e26171ba..882e2382 100644
--- a/src/model/eventsmodel.cpp
+++ b/src/model/eventsmodel.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "eventsmodel.h"
 
diff --git a/src/model/eventsmodel.h b/src/model/eventsmodel.h
index b1f680bc..27c348db 100644
--- a/src/model/eventsmodel.h
+++ b/src/model/eventsmodel.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_EVENTSMODEL_H
 #define KTIMETRACKER_EVENTSMODEL_H
diff --git a/src/model/projectmodel.cpp b/src/model/projectmodel.cpp
index b386a6f9..13a3bbbb 100644
--- a/src/model/projectmodel.cpp
+++ b/src/model/projectmodel.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "projectmodel.h"
 
diff --git a/src/model/projectmodel.h b/src/model/projectmodel.h
index 341456d4..5dd07994 100644
--- a/src/model/projectmodel.h
+++ b/src/model/projectmodel.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_PROJECTMODEL_H
 #define KTIMETRACKER_PROJECTMODEL_H
diff --git a/src/model/task.cpp b/src/model/task.cpp
index d3059a6a..15c77078 100644
--- a/src/model/task.cpp
+++ b/src/model/task.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 1997 by Stephan Kulow <coolo at kde.org>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 1997 Stephan Kulow <coolo at kde.org>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "task.h"
 
diff --git a/src/model/task.h b/src/model/task.h
index 9a403295..9c61a0b8 100644
--- a/src/model/task.h
+++ b/src/model/task.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 1997 by Stephan Kulow <coolo at kde.org>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 1997 Stephan Kulow <coolo at kde.org>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_TASK_H
 #define KTIMETRACKER_TASK_H
diff --git a/src/model/tasksmodel.cpp b/src/model/tasksmodel.cpp
index bd5bbc1d..3f2f571e 100644
--- a/src/model/tasksmodel.cpp
+++ b/src/model/tasksmodel.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "tasksmodel.h"
 
diff --git a/src/model/tasksmodel.h b/src/model/tasksmodel.h
index c4e4092b..02f9ba9e 100644
--- a/src/model/tasksmodel.h
+++ b/src/model/tasksmodel.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_TASKSMODEL_H
 #define KTIMETRACKER_TASKSMODEL_H
diff --git a/src/model/tasksmodelitem.cpp b/src/model/tasksmodelitem.cpp
index 96d0e1fc..acf0e2c4 100644
--- a/src/model/tasksmodelitem.cpp
+++ b/src/model/tasksmodelitem.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "tasksmodelitem.h"
 
diff --git a/src/model/tasksmodelitem.h b/src/model/tasksmodelitem.h
index 21e1b095..eaeb7e26 100644
--- a/src/model/tasksmodelitem.h
+++ b/src/model/tasksmodelitem.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_TASKSMODELITEM_H
 #define KTIMETRACKER_TASKSMODELITEM_H
diff --git a/src/org.kde.ktimetracker.desktop b/src/org.kde.ktimetracker.desktop
index 4c4cc179..282242d3 100644
--- a/src/org.kde.ktimetracker.desktop
+++ b/src/org.kde.ktimetracker.desktop
@@ -1,3 +1,9 @@
+# SPDX-FileCopyrightText: 2019 Friedrich W. H. Kossebau <kossebau at kde.org>
+# SPDX-FileCopyrightText: 2022 Toni Asensi Esteve <toni.asensi at kdemail.net>
+# SPDX-FileCopyrightText: 2024 Laurent Montel <montel at kde.org>
+
+# SPDX-License-Identifier: CC0-1.0
+
 [Desktop Entry]
 Name=KTimeTracker
 Name[ca]=KTimeTracker
diff --git a/src/org.kde.ktimetracker.ktimetracker.xml b/src/org.kde.ktimetracker.ktimetracker.xml
index eabb2c52..ea3b31a9 100644
--- a/src/org.kde.ktimetracker.ktimetracker.xml
+++ b/src/org.kde.ktimetracker.ktimetracker.xml
@@ -1,5 +1,10 @@
 <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
 <node>
   <interface name="org.kde.ktimetracker.ktimetracker">
     <method name="version">
diff --git a/src/reportcriteria.h b/src/reportcriteria.h
index d7b543a9..75753238 100644
--- a/src/reportcriteria.h
+++ b/src/reportcriteria.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2004 by Mark Bucciarelli <mark at hubcapconsulting.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2004 Mark Bucciarelli <mark at hubcapconsulting.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef REPORTCRITERIA_H
 #define REPORTCRITERIA_H
diff --git a/src/settings/cfgbehavior.ui b/src/settings/cfgbehavior.ui
index fcd59cac..b47a00de 100644
--- a/src/settings/cfgbehavior.ui
+++ b/src/settings/cfgbehavior.ui
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
  <class>BehaviorPage</class>
  <widget class="QWidget" name="BehaviorPage">
   <property name="geometry">
diff --git a/src/settings/cfgdisplay.ui b/src/settings/cfgdisplay.ui
index 283ca67a..7f3724b7 100644
--- a/src/settings/cfgdisplay.ui
+++ b/src/settings/cfgdisplay.ui
@@ -1,6 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>DisplayPage</class>
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+<class>DisplayPage</class>
  <widget class="QWidget" name="DisplayPage">
   <property name="geometry">
    <rect>
diff --git a/src/settings/cfgstorage.ui b/src/settings/cfgstorage.ui
index 3c60ddaf..31ea57e2 100644
--- a/src/settings/cfgstorage.ui
+++ b/src/settings/cfgstorage.ui
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <class>StoragePage</class>
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
+<class>StoragePage</class>
  <widget class="QWidget" name="StoragePage">
   <property name="geometry">
    <rect>
diff --git a/src/settings/ktimetracker.kcfg b/src/settings/ktimetracker.kcfg
index 31ddda43..b86cecfd 100644
--- a/src/settings/ktimetracker.kcfg
+++ b/src/settings/ktimetracker.kcfg
@@ -1,4 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+SPDX-License-Identifier: GPL-2.0-or-later
+-->
 <kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
diff --git a/src/settings/ktimetracker.kcfgc b/src/settings/ktimetracker.kcfgc
index b8122879..f0edd836 100644
--- a/src/settings/ktimetracker.kcfgc
+++ b/src/settings/ktimetracker.kcfgc
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2021 David Stächele <david at daiwai.de>
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 File=ktimetracker.kcfg
 ClassName=KTimeTrackerSettings
 Singleton=true
diff --git a/src/settings/ktimetrackerconfigdialog.cpp b/src/settings/ktimetrackerconfigdialog.cpp
index 7667d819..f84320ad 100644
--- a/src/settings/ktimetrackerconfigdialog.cpp
+++ b/src/settings/ktimetrackerconfigdialog.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2009 by Laurent Montel <montel at kde.org>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2009 Laurent Montel <montel at kde.org>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ktimetrackerconfigdialog.h"
 
diff --git a/src/settings/ktimetrackerconfigdialog.h b/src/settings/ktimetrackerconfigdialog.h
index 17d8b30f..46cc1efe 100644
--- a/src/settings/ktimetrackerconfigdialog.h
+++ b/src/settings/ktimetrackerconfigdialog.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2009 by Laurent Montel <montel at kde.org>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2009 Laurent Montel <montel at kde.org>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKERCONFIGDIALOG_H
 #define KTIMETRACKERCONFIGDIALOG_H
diff --git a/src/taskview.cpp b/src/taskview.cpp
index 81118232..148a189e 100644
--- a/src/taskview.cpp
+++ b/src/taskview.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "taskview.h"
 
diff --git a/src/taskview.h b/src/taskview.h
index a35de65d..ec1ade94 100644
--- a/src/taskview.h
+++ b/src/taskview.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_TASK_VIEW
 #define KTIMETRACKER_TASK_VIEW
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index dd5794a7..2c4da8e4 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: BSD-3-Clause
+
 find_package(Qt6Test CONFIG REQUIRED)
 include(ECMAddTests)
 
diff --git a/src/tests/exportcsvtest.cpp b/src/tests/exportcsvtest.cpp
index 4ec18b6c..7d190ba0 100644
--- a/src/tests/exportcsvtest.cpp
+++ b/src/tests/exportcsvtest.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include <QTest>
 
diff --git a/src/tests/formattimetest.cpp b/src/tests/formattimetest.cpp
index 81bce263..210e7fbe 100644
--- a/src/tests/formattimetest.cpp
+++ b/src/tests/formattimetest.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include <QTest>
 
diff --git a/src/tests/helpers.cpp b/src/tests/helpers.cpp
index 794395c9..57d14b62 100644
--- a/src/tests/helpers.cpp
+++ b/src/tests/helpers.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "helpers.h"
 
diff --git a/src/tests/helpers.h b/src/tests/helpers.h
index e00491d8..5a4a11fa 100644
--- a/src/tests/helpers.h
+++ b/src/tests/helpers.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_HELPERS_H
 #define KTIMETRACKER_HELPERS_H
diff --git a/src/tests/plannerparsertest.cpp b/src/tests/plannerparsertest.cpp
index ade3c80f..9f021a4d 100644
--- a/src/tests/plannerparsertest.cpp
+++ b/src/tests/plannerparsertest.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include <QTest>
 
diff --git a/src/tests/storagetest.cpp b/src/tests/storagetest.cpp
index 1a7e890f..64f5474c 100644
--- a/src/tests/storagetest.cpp
+++ b/src/tests/storagetest.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include <QTest>
 
diff --git a/src/tests/tasktest.cpp b/src/tests/tasktest.cpp
index 79c74879..6fdb8533 100644
--- a/src/tests/tasktest.cpp
+++ b/src/tests/tasktest.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include <QTest>
 
diff --git a/src/timetrackerstorage.cpp b/src/timetrackerstorage.cpp
index 0c95e726..2c47a39e 100644
--- a/src/timetrackerstorage.cpp
+++ b/src/timetrackerstorage.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003, 2004 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003, 2004 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 /** TimeTrackerStorage
   * This class cares for the storage of ktimetracker's data.
diff --git a/src/timetrackerstorage.h b/src/timetrackerstorage.h
index 52079872..d90c9318 100644
--- a/src/timetrackerstorage.h
+++ b/src/timetrackerstorage.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Mark Bucciarelli <mark at hubcapconsutling.com>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Mark Bucciarelli <mark at hubcapconsutling.com>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef KTIMETRACKER_STORAGE_H
 #define KTIMETRACKER_STORAGE_H
diff --git a/src/timetrackerwidget.cpp b/src/timetrackerwidget.cpp
index e424ee78..c7341f68 100644
--- a/src/timetrackerwidget.cpp
+++ b/src/timetrackerwidget.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "timetrackerwidget.h"
 
diff --git a/src/timetrackerwidget.h b/src/timetrackerwidget.h
index a8876a53..e7f841d3 100644
--- a/src/timetrackerwidget.h
+++ b/src/timetrackerwidget.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TIMETRACKER_WIDGET_H
 #define TIMETRACKER_WIDGET_H
diff --git a/src/tray.cpp b/src/tray.cpp
index 8be49049..cb4c24ce 100644
--- a/src/tray.cpp
+++ b/src/tray.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 /*
  * TrayIcon.
diff --git a/src/tray.h b/src/tray.h
index 49850b92..38fc08cc 100644
--- a/src/tray.h
+++ b/src/tray.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2003 by Scott Monachello <smonach at cox.net>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2003 Scott Monachello <smonach at cox.net>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TRAY_ICON_H
 #define TRAY_ICON_H
diff --git a/src/treeviewheadercontextmenu.cpp b/src/treeviewheadercontextmenu.cpp
index ff510ac5..5c8abc2c 100644
--- a/src/treeviewheadercontextmenu.cpp
+++ b/src/treeviewheadercontextmenu.cpp
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "treeviewheadercontextmenu.h"
 
diff --git a/src/treeviewheadercontextmenu.h b/src/treeviewheadercontextmenu.h
index 70ce5083..460c71eb 100644
--- a/src/treeviewheadercontextmenu.h
+++ b/src/treeviewheadercontextmenu.h
@@ -1,24 +1,9 @@
 /*
- * Copyright (C) 2007 by Mathias Soeken <msoeken at tzi.de>
- * Copyright (C) 2019  Alexander Potashev <aspotashev at gmail.com>
- *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *   GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License along
- *   with this program; if not, write to the
- *      Free Software Foundation, Inc.
- *      51 Franklin Street, Fifth Floor
- *      Boston, MA  02110-1301  USA.
- *
- */
+    SPDX-FileCopyrightText: 2007 Mathias Soeken <msoeken at tzi.de>
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TREEVIEWHEADERCONTEXTMENU_H
 #define TREEVIEWHEADERCONTEXTMENU_H
diff --git a/src/widgets/searchline.cpp b/src/widgets/searchline.cpp
index 875e1519..bfcf3af5 100644
--- a/src/widgets/searchline.cpp
+++ b/src/widgets/searchline.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "searchline.h"
 
diff --git a/src/widgets/searchline.h b/src/widgets/searchline.h
index 4483f224..ae14e929 100644
--- a/src/widgets/searchline.h
+++ b/src/widgets/searchline.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_SEARCHLINE_H
 #define KTIMETRACKER_SEARCHLINE_H
diff --git a/src/widgets/taskswidget.cpp b/src/widgets/taskswidget.cpp
index fea9f03a..2f43316a 100644
--- a/src/widgets/taskswidget.cpp
+++ b/src/widgets/taskswidget.cpp
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #include "taskswidget.h"
 
diff --git a/src/widgets/taskswidget.h b/src/widgets/taskswidget.h
index b8a1d0bd..a9c1722f 100644
--- a/src/widgets/taskswidget.h
+++ b/src/widgets/taskswidget.h
@@ -1,22 +1,8 @@
 /*
- * Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License or (at your option) version 3 or any later version
- * accepted by the membership of KDE e.V. (or its successor approved
- * by the membership of KDE e.V.), which shall act as a proxy
- * defined in Section 14 of version 3 of the license.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
+    SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+
+    SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
 
 #ifndef KTIMETRACKER_TASKSWIDGET_H
 #define KTIMETRACKER_TASKSWIDGET_H
diff --git a/test/conftest.py b/test/conftest.py
index 8d8410eb..7528a629 100644
--- a/test/conftest.py
+++ b/test/conftest.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import pytest
 
diff --git a/test/fixture/app.py b/test/fixture/app.py
index d1b76bb3..5a3d7f9a 100644
--- a/test/fixture/app.py
+++ b/test/fixture/app.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import time
 import os
diff --git a/test/requirements.txt b/test/requirements.txt
index d46637c2..4e7d473f 100644
--- a/test/requirements.txt
+++ b/test/requirements.txt
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
 pycairo==1.20.1
 pydbus==0.6.0
 PyGObject==3.42.0
diff --git a/test/test_active_tasks.py b/test/test_active_tasks.py
index 94eed860..44d22ac5 100644
--- a/test/test_active_tasks.py
+++ b/test/test_active_tasks.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_active_tasks(app_testfile):
diff --git a/test/test_benchmark.py b/test/test_benchmark.py
index c883071e..bea498dd 100644
--- a/test/test_benchmark.py
+++ b/test/test_benchmark.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 # Old comments from Bash-based benchmark:
diff --git a/test/test_booktime.py b/test/test_booktime.py
index f988f916..118ac40f 100644
--- a/test/test_booktime.py
+++ b/test/test_booktime.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_bad_date(app_testfile):
diff --git a/test/test_changetime.py b/test/test_changetime.py
index 643e2356..61212bd3 100644
--- a/test/test_changetime.py
+++ b/test/test_changetime.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_change_time(app_testfile):
diff --git a/test/test_delete.py b/test/test_delete.py
index 2cb497dd..b4595661 100644
--- a/test/test_delete.py
+++ b/test/test_delete.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_delete(app_testfile):
diff --git a/test/test_import_export.py b/test/test_import_export.py
index baaba0a3..866ae514 100644
--- a/test/test_import_export.py
+++ b/test/test_import_export.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import os
 import tempfile
diff --git a/test/test_refresh_on_change.py b/test/test_refresh_on_change.py
index 95acfbfd..6fc8e1ac 100644
--- a/test/test_refresh_on_change.py
+++ b/test/test_refresh_on_change.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import time
 from datetime import datetime
diff --git a/test/test_relative_path.py b/test/test_relative_path.py
index c3f7876c..5b07eaaa 100644
--- a/test/test_relative_path.py
+++ b/test/test_relative_path.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import os
 
diff --git a/test/test_samename_tasks.py b/test/test_samename_tasks.py
index 685e1810..e0efc75f 100644
--- a/test/test_samename_tasks.py
+++ b/test/test_samename_tasks.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_same_name_tasks(app_testfile):
diff --git a/test/test_version.py b/test/test_version.py
index fb1e6d8f..6042ae40 100644
--- a/test/test_version.py
+++ b/test/test_version.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 
 def test_delete_parent(app_testfile):
diff --git a/test/test_webdav.py b/test/test_webdav.py
index da1c8dc3..4db99357 100644
--- a/test/test_webdav.py
+++ b/test/test_webdav.py
@@ -1,20 +1,6 @@
-# Copyright (c) 2019 Alexander Potashev <aspotashev at gmail.com>
+# SPDX-FileCopyrightText: 2019 Alexander Potashev <aspotashev at gmail.com>
 #
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation; either version 2 of
-# the License or (at your option) version 3 or any later version
-# accepted by the membership of KDE e.V. (or its successor approved
-# by the membership of KDE e.V.), which shall act as a proxy
-# defined in Section 14 of version 3 of the license.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 import threading
 import time


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