But when signing orig.podofo.pdf a second time to
orig.podofo.podofo.pdf, then Adobe reports the first signature as
invalid (see attached screenshot and documents).
Hi,
depending on the content of PDF (especially whether it contains any
forms/annotations) it can be due to this:
https://sourceforge.net/p/podofo/code/HEAD/tree/podofo/trunk/tools/podofosign/podofosign.cpp#l928
Hi, thank you for the hint.
I just tested, but that code does not get triggered, ie
`pAcroForm->GetNeedAppearances()` returns `false`.
The documents has no forms, just a single image, and is linearized,
which makes unfortunately the analysis more difficult.
Notice that the fact that the document is linearized should not be a
problem, since I'm able to sign more than once linearized documents and
Adobe Reader does not warn about broken signatures.
Patches welcome.
If only I would know where the problem lies, I would gladly patch it :-)
Bye,
zyx
Federico
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