[okular] [Bug 435379] Does not show TSA timestamp signature

[Swyter]

https://bugs.kde.org/show_bug.cgi?id=435379

Swyter <swyterzone at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |swyterzone at gmail.com

--- Comment #5 from Swyter <swyterzone at gmail.com> ---
This is important because without attaching a timestamp countersignature the
document's signature will expire when the original certificate does, and it
will still uphold the validity of the document if the certificate gets revoked
down the line/after the fact.

It is also required for some official documents in the European Union. The fact
that on Linux there is no Acrobat Reader and there is only two programs able to
actually cryptographically-sign PDFs (Okular and jsignpdf). Only jsignpdf
supports setting TSA default servers while signing, and once signed there is no
visibility. So we still depend on Windows software to see if it actually
worked.

So yeah, I'd add two needed improvements here (1) being able to choose and use
TSA servers in Okular, and (2) being able to view countersignatures and show
the validity of the combination of both (in green) like Adobe Reader does via
top bar.

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