On Mon, 2018-08-27 at 13:30 +0200, Federico Kircheis wrote:
> 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
Patches welcome.
        Bye,
        zyx


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