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

[Nicolas Fella]

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

--- Comment #3 from Nicolas Fella <nicolas.fella at gmx.de> ---
It looks like this does not explain the problem. Signing
https://invent.kde.org/graphics/okular/-/blob/master/autotests/data/hello_with_dummy_signature.pdf
with Acrobat doesn't add a DocMDP entry either.

The relevant part of the document signed by Okular:

%% Original object ID: 32 0
29 0 obj
<<
  /ByteRange [
    0
    490918
    499126
    378
  ]
  /Contents
  /Filter /Adobe.PPKLite
  /M (D:20230428140625+02'00')
  /Name (Nicolas Fella)
  /SubFilter /adbe.pkcs7.detached
  /Type /Sig
>>
endobj

And by Acrobat:

%% Original object ID: 18 0
23 0 obj
<<
  /ByteRange [
    0
    3871
    8413
    9388
  ]
  /Contents
  /Filter /Adobe.PPKLite
  /M (D:20230428140204+02'00')
  /Name (Nicolas Fella)
  /Prop_Build <<
    /App <<
      /Name /Adobe#20Acrobat#20Reader#20#2864-bit#29
      /OS [
        /Win
      ]
      /R 1507584
      /REx (2023.001.20143)
      /TrustedMode true
    >>
    /Filter <<
      /Date (Apr  4 2023 18:35:16)
      /Name /Adobe.PPKLite
      /R 131104
      /V 2
    >>
    /PubSec <<
      /Date (Apr  4 2023 18:35:16)
      /R 131105
    >>
  >>
  /SubFilter /adbe.pkcs7.detached
  /Type /Sig
>>
endobj

The difference is the /Prop_Build entry, but not sure this explains the issue

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