[okular] [Bug 461371] New: PDFs digitally signed with Okular become locked in Adobe Acrobat so no one else can sign it

[Cengiz Gunay]

https://bugs.kde.org/show_bug.cgi?id=461371

            Bug ID: 461371
           Summary: PDFs digitally signed with Okular become locked in
                    Adobe Acrobat so no one else can sign it
    Classification: Applications
           Product: okular
           Version: 21.08.3
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: cengique at users.sf.net
  Target Milestone: ---

SUMMARY

Once opened in Acrobat Reader or DC, it may allow you to make modifications,
but when you try to save the PDF again, it gives this vague error: "The
document could not be saved. There was a problem reading this document (105)."

It is important to have Okular interoperable with other tools, so that it can
be more widely used. 

The digital signature feature works well and it was a feature I have been
waiting for a long time, but I hope this issue can be fixed. I would not be
able to share signed documents with my colleagues who use non-open source
tools.

Theoretically, PDFs can be locked or left open after being digitally signed,
but even Adobe does not give you an option to lock a document. It is also not
clear if the locking is the issue here, or there is another problem with the
generated file.


STEPS TO REPRODUCE
1. Open a PDF file in Okular
2. Digitally sign it and save as a new PDF
3. Open the new PDF in Acrobat Reader or DC, try to sign or save

OBSERVED RESULT

Getting the above error.

EXPECTED RESULT

For forms that need to be signed by multiple people, I would expect to be able
to add another signature in Adobe products.

SOFTWARE/OS VERSIONS
Windows: 10/Acrobat DC (new install)
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I can provide example files if needed.

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