I doubt there is a way.
It's most likely that the signing code makes a MD5 checksum (or similar)
of the file when it is signed.
If the file is changed, checking the signing will re-calculate the
checksum and find that it is different. There isn't any info on what
changed, just that SOMETHING changed.
On 10/6/2023 8:50 PM, Tilman Hausherr wrote:
On 06.10.2023 19:50, Marc Kaufman wrote:
I find myself debugging PDF files where Acrobat claims "Document has
been altered or corrupted since it was signed." I would dearly love
to see which objects belong to the last xref (color code is OK). Has
anyone added that feature to PDF Debugger, or know where I can find
one? Just comparing revisions is not enough, since sometimes the
"changed" object is identical to the same object in the previous
revision.
I don't know of any. I research such questions the hard way, with
NOTEPAD++.
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