[education/kbruch] /: Convert license headers to SPDX expressions

Andreas Cord-Landwehr null at kde.org
Sun Jan 17 09:55:21 GMT 2021


Git commit a4ecd87e2307d290c395242cf48a44533b507af9 by Andreas Cord-Landwehr.
Committed on 10/01/2021 at 09:29.
Pushed by cordlandwehr into branch 'master'.

Convert license headers to SPDX expressions

D  +0    -339  COPYING
M  +6    -2    doc/index.docbook
M  +4    -0    doc/man-kbruch.1.docbook
M  +4    -0    org.kde.kbruch.appdata.xml
M  +9    -18   src/AppMenuWidget.cpp
M  +9    -18   src/AppMenuWidget.h
M  +4    -15   src/ExerciseBase.cpp
M  +5    -16   src/ExerciseBase.h
M  +7    -19   src/ExerciseCompare.cpp
M  +7    -19   src/ExerciseCompare.h
M  +7    -19   src/ExerciseConvert.cpp
M  +7    -19   src/ExerciseConvert.h
M  +7    -19   src/ExerciseFactorize.cpp
M  +7    -19   src/ExerciseFactorize.h
M  +2    -15   src/ExerciseMixedNumbers.cpp
M  +2    -15   src/ExerciseMixedNumbers.h
M  +5    -16   src/ExercisePercentage.cpp
M  +5    -16   src/ExercisePercentage.h
M  +9    -20   src/FractionBaseWidget.cpp
M  +9    -20   src/FractionBaseWidget.h
M  +8    -19   src/FractionPainter.cpp
M  +7    -19   src/FractionPainter.h
M  +8    -19   src/FractionRingWidget.cpp
M  +7    -19   src/FractionRingWidget.h
M  +9    -20   src/KBruch.cpp
M  +8    -20   src/KBruch.h
M  +10   -20   src/MainQtWidget.cpp
M  +10   -20   src/MainQtWidget.h
M  +2    -15   src/PrimeFactorsLineEdit.cpp
M  +2    -15   src/PrimeFactorsLineEdit.h
M  +6    -16   src/PrimeNumber.cpp
M  +6    -16   src/PrimeNumber.h
M  +8    -20   src/Ratio.cpp
M  +8    -19   src/Ratio.h
M  +8    -19   src/RatioWidget.cpp
M  +8    -19   src/RatioWidget.h
M  +9    -20   src/RationalWidget.cpp
M  +6    -16   src/RationalWidget.h
M  +8    -19   src/ResultWidget.cpp
M  +8    -19   src/ResultWidget.h
M  +6    -18   src/StatisticsBarWidget.cpp
M  +6    -18   src/StatisticsBarWidget.h
M  +10   -20   src/StatisticsView.cpp
M  +10   -20   src/StatisticsView.h
M  +9    -20   src/Task.cpp
M  +9    -20   src/Task.h
M  +6    -18   src/TaskColors.h
M  +8    -19   src/TaskView.cpp
M  +7    -19   src/TaskView.h
M  +8    -19   src/TaskWidget.cpp
M  +8    -19   src/TaskWidget.h

https://invent.kde.org/education/kbruch/commit/a4ecd87e2307d290c395242cf48a44533b507af9

diff --git a/COPYING b/COPYING
deleted file mode 100644
index d511905..0000000
--- a/COPYING
+++ /dev/null
@@ -1,339 +0,0 @@
-		    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 document, but changing it is not allowed.
-
-			    Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Lesser General Public License instead.)  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
-this service 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 make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must give the recipients all the rights that
-you have.  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.
-
-  We protect your rights with two steps: (1) copyright the software, and
-(2) offer you this license which gives you legal permission to copy,
-distribute and/or modify the software.
-
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-that everyone understands that there is no warranty for this free
-software.  If the software is modified by someone else and passed on, we
-want its recipients to know that what they have is not the original, so
-that any problems introduced by others will not reflect on the original
-authors' reputations.
-
-  Finally, any free program is threatened constantly by software
-patents.  We wish to avoid the danger that redistributors of a free
-program will individually obtain patent licenses, in effect making the
-program proprietary.  To prevent this, we have made it clear that any
-patent must be licensed for everyone's free use or not licensed at all.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.
-
-		    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. This License applies to any program or other work which contains
-a notice placed by the copyright holder saying it may be distributed
-under the terms of this General Public License.  The "Program", below,
-refers to any such program or work, and a "work based on the Program"
-means either the Program or any derivative work under copyright law:
-that is to say, a work containing the Program or a portion of it,
-either verbatim or with modifications and/or translated into another
-language.  (Hereinafter, translation is included without limitation in
-the term "modification".)  Each licensee is addressed as "you".
-
-Activities other than copying, distribution and modification are not
-covered by this License; they are outside its scope.  The act of
-running the Program is not restricted, and the output from the Program
-is covered only if its contents constitute a work based on the
-Program (independent of having been made by running the Program).
-Whether that is true depends on what the Program does.
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-source code as you receive it, in any medium, provided that you
-conspicuously and appropriately publish on each copy an appropriate
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-notices that refer to this License and to the absence of any warranty;
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-along with the Program.
-
-You may charge a fee for the physical act of transferring a copy, and
-you may at your option offer warranty protection in exchange for a fee.
-
-  2. You may modify your copy or copies of the Program or any portion
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-    when run, you must cause it, when started running for such
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-distribute the same sections as part of a whole which is a work based
-on the Program, the distribution of the whole must be on the terms of
-this License, whose permissions for other licensees extend to the
-entire whole, and thus to each and every part regardless of who wrote it.
-
-Thus, it is not the intent of this section to claim rights or contest
-your rights to work written entirely by you; rather, the intent is to
-exercise the right to control the distribution of derivative or
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-
-In addition, mere aggregation of another work not based on the Program
-with the Program (or with a work based on the Program) on a volume of
-a storage or distribution medium does not bring the other work under
-the scope of this License.
-
-  3. You may copy and distribute the Program (or a work based on it,
-under Section 2) in object code or executable form under the terms of
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-    to distribute corresponding source code.  (This alternative is
-    allowed only for noncommercial distribution and only if you
-    received the program in object code or executable form with such
-    an offer, in accord with Subsection b above.)
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-The source code for a work means the preferred form of the work for
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-compelled to copy the source along with the object code.
-
-  4. You may not copy, modify, sublicense, or distribute the Program
-except as expressly provided under this License.  Any attempt
-otherwise to copy, modify, sublicense or distribute the Program is
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-However, parties who have received copies, or rights, from you under
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-  5. You are not required to accept this License, since you have not
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-prohibited by law if you do not accept this License.  Therefore, by
-modifying or distributing the Program (or any work based on the
-Program), you indicate your acceptance of this License to do so, and
-all its terms and conditions for copying, distributing or modifying
-the Program or works based on it.
-
-  6. Each time you redistribute the Program (or any work based on the
-Program), the recipient automatically receives a license from the
-original licensor to copy, distribute or modify the Program subject to
-these terms and conditions.  You may not impose any further
-restrictions on the recipients' exercise of the rights granted herein.
-You are not responsible for enforcing compliance by third parties to
-this License.
-
-  7. If, as a consequence of a court judgment or allegation of patent
-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
-otherwise) that contradict the conditions of this License, they do not
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-distribute so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you
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-license would not permit royalty-free redistribution of the Program by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Program.
-
-If any portion of this section is held invalid or unenforceable under
-any particular circumstance, the balance of the section is intended to
-apply and the section as a whole is intended to apply in other
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-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
-through that system in reliance on consistent application of that
-system; it is up to the author/donor to decide if he or she is willing
-to distribute software through any other system and a licensee cannot
-impose that choice.
-
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
-
-  8. If the distribution and/or use of the Program is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Program under this License
-may add an explicit geographical distribution limitation excluding
-those countries, so that distribution is permitted only in or among
-countries not thus excluded.  In such case, this License incorporates
-the limitation as if written in the body of this License.
-
-  9. The Free Software Foundation may publish revised and/or new versions
-of the General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-Each version is given a distinguishing version number.  If the Program
-specifies a version number of this License which applies to it and "any
-later version", you have the option of following the terms and conditions
-either of that version or of any later version published by the Free
-Software Foundation.  If the Program does not specify a version number of
-this License, you may choose any version ever published by the Free Software
-Foundation.
-
-  10. If you wish to incorporate parts of the Program into other free
-programs whose distribution conditions are different, write to the author
-to ask for permission.  For software which is copyrighted by the Free
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-make exceptions for this.  Our decision will be guided by the two goals
-of preserving the free status of all derivatives of our free software and
-of promoting the sharing and reuse of software generally.
-
-			    NO WARRANTY
-
-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, 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
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-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.
-
-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
-REDISTRIBUTE 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.
-
-		     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 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 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
-
-This 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.
diff --git a/doc/index.docbook b/doc/index.docbook
index c06b766..79132fd 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -4,7 +4,11 @@
 <!ENTITY % addindex "IGNORE">
 <!ENTITY % English "INCLUDE"><!-- change language only here -->
 ]>
-
+<!--
+SPDX-FileCopyrightText: 2001-2005 Sebastian Stein <seb.kde at hpfsc.de>
+SPDX-FileCopyrightText: 2008 Anne-Marie Mahfouf
+SPDX-License-Identifier: GFDL-1.2-only
+-->
 <book id="kbruch" lang="&language;">
 
 <bookinfo>
@@ -684,7 +688,7 @@ clicking on the <guibutton>Next</guibutton> button.
 <title>Credits and License</title>
 <para>&kbruch;</para>
 <para>
-Program and documentation Copyright, 2001-2011 Sebastian Stein
+Program and documentation SPDX-FileCopyrightText: 2001-2011 Sebastian Stein
  <email>seb.kde at hpfsc.de</email>
 </para>
 
diff --git a/doc/man-kbruch.1.docbook b/doc/man-kbruch.1.docbook
index fdc027a..841cbae 100644
--- a/doc/man-kbruch.1.docbook
+++ b/doc/man-kbruch.1.docbook
@@ -2,6 +2,10 @@
 <!DOCTYPE refentry PUBLIC "-//KDE//DTD DocBook XML V4.5-Based Variant V1.1//EN" "dtd/kdedbx45.dtd" [
 <!ENTITY % English "INCLUDE">
 ]>
+<!--
+SPDX-FileCopyrightText: 2005 Lauri Watts
+SPDX-License-Identifier: GFDL-1.2-only
+-->
 
 <refentry lang="&language;">
 <refentryinfo>
diff --git a/org.kde.kbruch.appdata.xml b/org.kde.kbruch.appdata.xml
index 9ae1e8c..7367aa1 100644
--- a/org.kde.kbruch.appdata.xml
+++ b/org.kde.kbruch.appdata.xml
@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+SPDX-FileCopyrightText: 2013-2020 KDE Translators <kde-i18n-doc at kde.org>
+SPDX-License-Identifier: CC0-1.0
+-->
 <component type="desktop">
   <id>org.kde.kbruch.desktop</id>
   <metadata_license>CC0-1.0</metadata_license>
diff --git a/src/AppMenuWidget.cpp b/src/AppMenuWidget.cpp
index f86d0db..4b17c8d 100644
--- a/src/AppMenuWidget.cpp
+++ b/src/AppMenuWidget.cpp
@@ -1,21 +1,12 @@
-/***************************************************************************
-                 appmenuwidget.cpp  -  The main Qt/KDE window
-                             -------------------
-    begin                : Tue Sep 16 00:00:00 CET 2008
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    appmenuwidget.cpp  -  The main Qt/KDE window
+
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #include "AppMenuWidget.h"
 
 /* these includes are needed for KDE support */
diff --git a/src/AppMenuWidget.h b/src/AppMenuWidget.h
index d690934..1e6f063 100644
--- a/src/AppMenuWidget.h
+++ b/src/AppMenuWidget.h
@@ -1,21 +1,12 @@
-/***************************************************************************
-                          appmenuwidget.h  -  The main Qt/KDE window
-                             -------------------
-    begin                : Tue Sep 16 00:00:00 CET 2008
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    appmenuwidget.h  -  The main Qt/KDE window
+
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #ifndef APPMENUWIDGET_H
 #define APPMENUWIDGET_H
 
diff --git a/src/ExerciseBase.cpp b/src/ExerciseBase.cpp
index d500390..51a06b6 100644
--- a/src/ExerciseBase.cpp
+++ b/src/ExerciseBase.cpp
@@ -1,19 +1,8 @@
-/***************************************************************************
-                                ExerciseBase.cpp
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.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.                                   *
- *                                                                         *
- ***************************************************************************/
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ExerciseBase.h"
 
diff --git a/src/ExerciseBase.h b/src/ExerciseBase.h
index afe14be..c7cbf71 100644
--- a/src/ExerciseBase.h
+++ b/src/ExerciseBase.h
@@ -1,19 +1,8 @@
-/***************************************************************************
-                                ExerciseBase.h
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXERCISEBASE_H
 #define EXERCISEBASE_H
diff --git a/src/ExerciseCompare.cpp b/src/ExerciseCompare.cpp
index 8c01824..88ebbcb 100644
--- a/src/ExerciseCompare.cpp
+++ b/src/ExerciseCompare.cpp
@@ -1,22 +1,10 @@
-/***************************************************************************
-                             ExerciseCompare.cpp
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ExerciseCompare.h"
 
diff --git a/src/ExerciseCompare.h b/src/ExerciseCompare.h
index 2cf40c1..05d73c7 100644
--- a/src/ExerciseCompare.h
+++ b/src/ExerciseCompare.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              ExerciseCompare.h
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXERCISECOMPARE_H
 #define EXERCISECOMPARE_H
diff --git a/src/ExerciseConvert.cpp b/src/ExerciseConvert.cpp
index e8c38b8..308ea13 100644
--- a/src/ExerciseConvert.cpp
+++ b/src/ExerciseConvert.cpp
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              ExerciseConvert.cpp
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ExerciseConvert.h"
 
diff --git a/src/ExerciseConvert.h b/src/ExerciseConvert.h
index 05d95af..97aa9c0 100644
--- a/src/ExerciseConvert.h
+++ b/src/ExerciseConvert.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              ExerciseConvert.h
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXERCISECONVERT_H
 #define EXERCISECONVERT_H
diff --git a/src/ExerciseFactorize.cpp b/src/ExerciseFactorize.cpp
index 39ae15f..88eb897 100644
--- a/src/ExerciseFactorize.cpp
+++ b/src/ExerciseFactorize.cpp
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              ExerciseFactorize.cpp
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ExerciseFactorize.h"
 
diff --git a/src/ExerciseFactorize.h b/src/ExerciseFactorize.h
index 0e31f17..17d661a 100644
--- a/src/ExerciseFactorize.h
+++ b/src/ExerciseFactorize.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              ExerciseFactorize.h
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXERCISEFACTORIZE_H
 #define EXERCISEFACTORIZE_H
diff --git a/src/ExerciseMixedNumbers.cpp b/src/ExerciseMixedNumbers.cpp
index aa2a4c5..60c6219 100644
--- a/src/ExerciseMixedNumbers.cpp
+++ b/src/ExerciseMixedNumbers.cpp
@@ -1,21 +1,8 @@
 /*
     KBruch - exercise to convert mixed numbers in ratios and vice versa
-    Copyright 2011 - Sebastian Stein <seb.kde at hpfsc.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: 2011 Sebastian Stein <seb.kde at hpfsc.de>
 
+    SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "ExerciseMixedNumbers.h"
diff --git a/src/ExerciseMixedNumbers.h b/src/ExerciseMixedNumbers.h
index ed1b6fd..bcb086b 100644
--- a/src/ExerciseMixedNumbers.h
+++ b/src/ExerciseMixedNumbers.h
@@ -1,21 +1,8 @@
 /*
     KBruch - exercise to convert mixed numbers in ratios and vice versa
-    Copyright 2011 - Sebastian Stein <seb.kde at hpfsc.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: 2011 - Sebastian Stein <seb.kde at hpfsc.de>
 
+    SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifndef EXERCISEMIXEDNUMBERS_H
diff --git a/src/ExercisePercentage.cpp b/src/ExercisePercentage.cpp
index debb8ae..97144bf 100644
--- a/src/ExercisePercentage.cpp
+++ b/src/ExercisePercentage.cpp
@@ -1,19 +1,8 @@
-/***************************************************************************
-                              ExercisePercentage.cpp
-                             -------------------
-    begin                : 2008/10/10
-    copyright            : (C) 2008 by Tiago Porangaba
-    email                : tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ExercisePercentage.h"
 
diff --git a/src/ExercisePercentage.h b/src/ExercisePercentage.h
index 5ef7656..0e683b0 100644
--- a/src/ExercisePercentage.h
+++ b/src/ExercisePercentage.h
@@ -1,19 +1,8 @@
-/***************************************************************************
-                              ExercisePercentage.h
-                             -------------------
-    begin                : 2008/10/10
-    copyright            : (C) 2008 by Tiago Porangaba
-    email                : tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef EXERCISEPERCENTAGE_H
 #define EXERCISEPERCENTAGE_H
diff --git a/src/FractionBaseWidget.cpp b/src/FractionBaseWidget.cpp
index 890badb..30406b7 100644
--- a/src/FractionBaseWidget.cpp
+++ b/src/FractionBaseWidget.cpp
@@ -1,23 +1,12 @@
-/***************************************************************************
-                 FractionBaseWidget.cpp  -  base fraction painting
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    FractionBaseWidget.cpp  -  base fraction painting
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "FractionBaseWidget.h"
 
diff --git a/src/FractionBaseWidget.h b/src/FractionBaseWidget.h
index 8bfa8f8..6c487e7 100644
--- a/src/FractionBaseWidget.h
+++ b/src/FractionBaseWidget.h
@@ -1,23 +1,12 @@
-/***************************************************************************
-                  FractionBaseWidget.h  -  base fraction painting
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    FractionBaseWidget.cpp  -  base fraction painting
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef FRACTIONBASEWIDGET_H
 #define FRACTIONBASEWIDGET_H
diff --git a/src/FractionPainter.cpp b/src/FractionPainter.cpp
index 777d862..7b4aa3b 100644
--- a/src/FractionPainter.cpp
+++ b/src/FractionPainter.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                              FractionPainter.cpp
-                             -------------------
-    begin                : 2008/09/18
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #include "FractionPainter.h"
 
 /* these includes are needed for Qt support */
diff --git a/src/FractionPainter.h b/src/FractionPainter.h
index 9cba56c..1b93e0a 100644
--- a/src/FractionPainter.h
+++ b/src/FractionPainter.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              FractionPainter.h
-                             -------------------
-    begin                : 2008/09/18
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef FRACTIONPAINTER_H
 #define FRACTIONPAINTER_H
diff --git a/src/FractionRingWidget.cpp b/src/FractionRingWidget.cpp
index 554de9d..35d633e 100644
--- a/src/FractionRingWidget.cpp
+++ b/src/FractionRingWidget.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                              FractionRingWidget.cpp
-                             -------------------
-    begin                : 2008/09/16
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #include "FractionRingWidget.h"
 
 /* these includes are needed for KDE support */
diff --git a/src/FractionRingWidget.h b/src/FractionRingWidget.h
index b67cc45..437d0eb 100644
--- a/src/FractionRingWidget.h
+++ b/src/FractionRingWidget.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              FractionRingWidget.h
-                             -------------------
-    begin                : 2008/09/16
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef FRACTIONRINGWIDGET_H
 #define FRACTIONRINGWIDGET_H
diff --git a/src/KBruch.cpp b/src/KBruch.cpp
index 12b9688..5f3cdea 100644
--- a/src/KBruch.cpp
+++ b/src/KBruch.cpp
@@ -1,23 +1,12 @@
-/***************************************************************************
-                          KBruch.cpp  -  Main File of KBruch
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    KBruch.cpp  -  Main File of KBruch
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "KBruch.h"
 
diff --git a/src/KBruch.h b/src/KBruch.h
index 6e8382b..2e30e2d 100644
--- a/src/KBruch.h
+++ b/src/KBruch.h
@@ -1,24 +1,12 @@
-/***************************************************************************
-                          KBruch.h  -  Header File
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    KBruch.cpp  -  Main File of KBruch
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
 
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef BRUCH_H
 #define BRUCH_H
diff --git a/src/MainQtWidget.cpp b/src/MainQtWidget.cpp
index 733d8ca..e9a69bd 100644
--- a/src/MainQtWidget.cpp
+++ b/src/MainQtWidget.cpp
@@ -1,23 +1,13 @@
-/***************************************************************************
-                          MainQtWidget.cpp  -  The main Qt/KDE window
-                             -------------------
-    begin                : Tue Mar 16 00:00:00 CET 2003
-    copyright            : (C) 2003-2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    MainQtWidget.cpp  -  The main Qt/KDE window
+    SPDX-FileCopyrightText: 2003-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #include "MainQtWidget.h"
 
 /* these includes are needed for KDE support */
diff --git a/src/MainQtWidget.h b/src/MainQtWidget.h
index 7aa8ec2..fe4ee6e 100644
--- a/src/MainQtWidget.h
+++ b/src/MainQtWidget.h
@@ -1,23 +1,13 @@
-/***************************************************************************
-                          MainQtWidget.h  -  The main Qt/KDE window
-                             -------------------
-    begin                : Tue Mar 16 00:00:00 CET 2003
-    copyright            : (C) 2003-2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    MainQtWidget.cpp  -  The main Qt/KDE window
+    SPDX-FileCopyrightText: 2003-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
 #ifndef MAINQTWIDGET_H
 #define MAINQTWIDGET_H
 
diff --git a/src/PrimeFactorsLineEdit.cpp b/src/PrimeFactorsLineEdit.cpp
index d2df177..6281e2a 100644
--- a/src/PrimeFactorsLineEdit.cpp
+++ b/src/PrimeFactorsLineEdit.cpp
@@ -1,21 +1,8 @@
 /*
     KBruch - line edit used for entering prime factors
-    Copyright 2011 - Sebastian Stein <seb.kde at hpfsc.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: 2011 Sebastian Stein <seb.kde at hpfsc.de>
 
+    SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "PrimeFactorsLineEdit.h"
diff --git a/src/PrimeFactorsLineEdit.h b/src/PrimeFactorsLineEdit.h
index 464eb92..b5dd199 100644
--- a/src/PrimeFactorsLineEdit.h
+++ b/src/PrimeFactorsLineEdit.h
@@ -1,21 +1,8 @@
 /*
     KBruch - line edit used for entering prime factors
-    Copyright 2011 - Sebastian Stein <seb.kde at hpfsc.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: 2011 Sebastian Stein <seb.kde at hpfsc.de>
 
+    SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifndef PRIMEFACTORSLINEEDIT_H
diff --git a/src/PrimeNumber.cpp b/src/PrimeNumber.cpp
index 7aa8c46..4e3d05b 100644
--- a/src/PrimeNumber.cpp
+++ b/src/PrimeNumber.cpp
@@ -1,19 +1,9 @@
-/***************************************************************************
-                          PrimeNumber.cpp  -  source code of class PrimeNumber
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    PrimeNumber.cpp  -  source code of class PrimeNumber
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "PrimeNumber.h"
 
diff --git a/src/PrimeNumber.h b/src/PrimeNumber.h
index 82f7d3a..d70bce9 100644
--- a/src/PrimeNumber.h
+++ b/src/PrimeNumber.h
@@ -1,19 +1,9 @@
-/***************************************************************************
-                          PrimeNumber.h  -  class PrimeNumber
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    PrimeNumber.cpp  -  source code of class PrimeNumber
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef PRIMENUMBER_H
 #define PRIMENUMBER_H
diff --git a/src/Ratio.cpp b/src/Ratio.cpp
index 36674d1..104d130 100644
--- a/src/Ratio.cpp
+++ b/src/Ratio.cpp
@@ -1,25 +1,13 @@
-/***************************************************************************
-                          Ratio.cpp  -  source code of class Ratio
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001-2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    Ratio.cpp  -  source code of class Ratio
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
 
-#include "Ratio.h"
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
+#include "Ratio.h"
 
 #ifdef DEBUG
 #include <QDebug>
diff --git a/src/Ratio.h b/src/Ratio.h
index 8f9861f..cddefd8 100644
--- a/src/Ratio.h
+++ b/src/Ratio.h
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          Ratio.h  -  class Ratio
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001-2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    Ratio.h  -  source code of class Ratio
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef RATIO_H
 #define RATIO_H
diff --git a/src/RatioWidget.cpp b/src/RatioWidget.cpp
index b3c7ac9..a1e3f1c 100644
--- a/src/RatioWidget.cpp
+++ b/src/RatioWidget.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          RatioWidget.h  -  paint a ratio
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RatioWidget.h  -  paint a ratio
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "RatioWidget.h"
 
diff --git a/src/RatioWidget.h b/src/RatioWidget.h
index c900f81..cd1f882 100644
--- a/src/RatioWidget.h
+++ b/src/RatioWidget.h
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          RatioWidget.h  -  paint a ratio
-                             -------------------
-    begin                : 2004/06/03
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RatioWidget.h  -  paint a ratio
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef RATIOWIDGET_H
 #define RATIOWIDGET_H
diff --git a/src/RationalWidget.cpp b/src/RationalWidget.cpp
index 94c4175..8c7d8c0 100644
--- a/src/RationalWidget.cpp
+++ b/src/RationalWidget.cpp
@@ -1,23 +1,12 @@
-/***************************************************************************
-                          RationalWidget.h  -  paint a rational number
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RationalWidget.cpp  -  paint a rational number
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "RationalWidget.h"
 
diff --git a/src/RationalWidget.h b/src/RationalWidget.h
index ed01166..4ed7452 100644
--- a/src/RationalWidget.h
+++ b/src/RationalWidget.h
@@ -1,19 +1,9 @@
-/***************************************************************************
-                          RationalWidget.h  -  paint a rational number
-                             -------------------
-    begin                : 2004/06/04
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RationalWidget.h  -  paint a rational number
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef RATIONALWIDGET_H
 #define RATIONALWIDGET_H
diff --git a/src/ResultWidget.cpp b/src/ResultWidget.cpp
index 7003539..e9acad5 100644
--- a/src/ResultWidget.cpp
+++ b/src/ResultWidget.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          ResultWidget.h  -  paint the result
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RatioWidget.cpp  -  paint a ratio
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "ResultWidget.h"
 
diff --git a/src/ResultWidget.h b/src/ResultWidget.h
index a90322e..eda8139 100644
--- a/src/ResultWidget.h
+++ b/src/ResultWidget.h
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          ResultWidget.h  -  paint the result
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    RatioWidget.h  -  paint a ratio
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef RESULTWIDGET_H
 #define RESULTWIDGET_H
diff --git a/src/StatisticsBarWidget.cpp b/src/StatisticsBarWidget.cpp
index 486aab6..5934004 100644
--- a/src/StatisticsBarWidget.cpp
+++ b/src/StatisticsBarWidget.cpp
@@ -1,21 +1,9 @@
-/***************************************************************************
-                          StatisticsBarWidget.cpp
-                             -------------------
-    begin                : 2008/09/02
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at gmail.com
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "StatisticsBarWidget.h"
 
diff --git a/src/StatisticsBarWidget.h b/src/StatisticsBarWidget.h
index 39df67e..7aefdfc 100644
--- a/src/StatisticsBarWidget.h
+++ b/src/StatisticsBarWidget.h
@@ -1,21 +1,9 @@
-/***************************************************************************
-                              StatisticsBarWidget.h
-                             -------------------
-    begin                : 2008/09/02
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef STATISTICSBARWIDGET_H
 #define STATISTICSBARWIDGET_H
diff --git a/src/StatisticsView.cpp b/src/StatisticsView.cpp
index 5d3591b..ad2cadd 100644
--- a/src/StatisticsView.cpp
+++ b/src/StatisticsView.cpp
@@ -1,23 +1,13 @@
-/***************************************************************************
-                          StatisticsView.cpp  -  the statistic window
-                             -------------------
-    begin                : Tue Mar 08 17:20:00 CET 2002
-    copyright            : (C) 2001 - 2004 by Sebastian Stein, Eva Brucherseifer
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    StatisticsView.cpp  -  the statistic window
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2001-2004 Eva Brucherseifer
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "StatisticsView.h"
 
diff --git a/src/StatisticsView.h b/src/StatisticsView.h
index 4679f89..bdb2ad6 100644
--- a/src/StatisticsView.h
+++ b/src/StatisticsView.h
@@ -1,23 +1,13 @@
-/***************************************************************************
-                          StatisticsView.cpp  -  Header File
-                             -------------------
-    begin                : Tue Mar 08 17:20:00 CET 2002
-    copyright            : (C) 2001 - 2004 by Sebastian Stein, Eva Brucherseifer
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    StatisticsView.cpp  -  Header File
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2001-2004 Eva Brucherseifer
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef STATISTICSVIEW_H
 #define STATISTICSVIEW_H
diff --git a/src/Task.cpp b/src/Task.cpp
index be93e06..ecfa3af 100644
--- a/src/Task.cpp
+++ b/src/Task.cpp
@@ -1,23 +1,12 @@
-/***************************************************************************
-                          Task.cpp  -  source code of class Task
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    Task.cpp  -  source code of class Task
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "Task.h"
 
diff --git a/src/Task.h b/src/Task.h
index 028a277..74f387c 100644
--- a/src/Task.h
+++ b/src/Task.h
@@ -1,23 +1,12 @@
-/***************************************************************************
-                          Task.h  -  class Task
-                             -------------------
-    begin                : Tue Nov 27 16:40:42 CET 2001
-    copyright            : (C) 2001 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    Task.h  -  class Task
+    SPDX-FileCopyrightText: 2001 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TASK_H
 #define TASK_H
diff --git a/src/TaskColors.h b/src/TaskColors.h
index 652649f..8a10764 100644
--- a/src/TaskColors.h
+++ b/src/TaskColors.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                              TaskColors.h
-                             -------------------
-    begin                : 2009/08/10
-    copyright            : (C) 2008 by Danilo Balzaque
-    email                : danilo.balzaque at ltia.fc.unesp.br
+/*
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Tiago Porangaba <tiago.porangaba at ltia.fc.unesp.br>
 
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TASKCOLORS_H
 #define TASKCOLORS_H
diff --git a/src/TaskView.cpp b/src/TaskView.cpp
index 8e3399f..a7e4f7d 100644
--- a/src/TaskView.cpp
+++ b/src/TaskView.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          TaskView.cpp  -  The task window
-                             -------------------
-    begin                : Tue Feb 08 13:41:00 CET 2002
-    copyright            : (C) 2001 - 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    StatisticsView.cpp  -  the statistic window
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "TaskView.h"
 
diff --git a/src/TaskView.h b/src/TaskView.h
index 2a106ae..09209d1 100644
--- a/src/TaskView.h
+++ b/src/TaskView.h
@@ -1,22 +1,10 @@
-/***************************************************************************
-                          TaskView.cpp  -  Header File
-                             -------------------
-    begin                : Tue Feb 08 13:42:00 CET 2002
-    copyright            : (C) 2001 - 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    SPDX-FileCopyrightText: 2001-2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TASKVIEW_H
 #define TASKVIEW_H
diff --git a/src/TaskWidget.cpp b/src/TaskWidget.cpp
index 632a42f..d5d301d 100644
--- a/src/TaskWidget.cpp
+++ b/src/TaskWidget.cpp
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          TaskWidget.cpp  -  paint a task
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    TaskWidget.cpp  -  paint a task
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include "TaskWidget.h"
 
diff --git a/src/TaskWidget.h b/src/TaskWidget.h
index 23be104..534e580 100644
--- a/src/TaskWidget.h
+++ b/src/TaskWidget.h
@@ -1,22 +1,11 @@
-/***************************************************************************
-                          TaskWidget.h  -  paint a task
-                             -------------------
-    begin                : 2004/05/30
-    copyright            : (C) 2004 by Sebastian Stein
-    email                : seb.kde at hpfsc.de
-
-    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo at ltia.fc.unesp.br
-    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque at ltia.fc.unesp.br
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   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.                                   *
- *                                                                         *
- ***************************************************************************/
+/*
+    TaskWidget.h  -  paint a task
+    SPDX-FileCopyrightText: 2004 Sebastian Stein <seb.kde at hpfsc.de>
+    SPDX-FileCopyrightText: 2008 Tadeu Araujo <tadeu.araujo at ltia.fc.unesp.br>
+    SPDX-FileCopyrightText: 2008 Danilo Balzaque <danilo.balzaque at ltia.fc.unesp.br>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #ifndef TASKWIDGET_H
 #define TASKWIDGET_H



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