Signing with Acrobat works. Did you not look at the SigFlags field,
which specifies Incremental Only saving? If you change ANY byte in the
area from byte 0 to the first EOF you will break the UR3 signature,
because the hash will change.
Marc
On 9/16/2025 10:09 AM, Coetmeur, Alain wrote:
the problem seems to be that the ByteRange are slightly different, and the
difference lead to a difference in the number of digits, thus the length of the
field.
What I don't understand is why when I try to force the maximum length for
ByteRange field for the Acroform/Field/0/V, it breaks the Perms/UR3 signing.
But I don't understand what is the incremental saving... PDF is very subtle.
Alain
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