https://bugs.kde.org/show_bug.cgi?id=461371
Nicolas Fella <nicolas.fe...@gmx.de> changed:
What |Removed |Added
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CC| |nicolas.fe...@gmx.de
--- Comment #2 from Nicolas Fella <nicolas.fe...@gmx.de> ---
PDF allows for some fine-grained control about what you can do with a signed
document and what not
Looking at https://www.verypdf.com/document/pdf-format-reference/pg_0733.htm I
see this:
The access permissions granted for this document. Valid values are:
1 No changes to the document are permitted; any change to the document
invalidates the signature
2 Permitted changes are filling in forms, instantiating page templates, and
signing; other changes invalidate the signature.
3 Permitted changes are the same as for 2, as well as annotation creation,
deletion, and modification; other changes invalidate the signature
Default value: 2
Okular/Poppler doesn't set this, so the default (2) applies. That should
explain why you cannot add a new signature (which is technically similar to
adding an annotation). You should be able to do the things described in 2, like
filling in forms.
Note that this is my understanding based on reading the linked site and the
poppler source, I haven't reproduced the issue to confirm yet
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