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I have an issue With multiple Digital Signatures in PDF Files using a USB Token. I am using open-source dll itextSharp for digital Sign and I am trying to multiple Sign in PDF File.
In this scenario user (A) have sign a single page PDF File, and after that append or merge another page in same PDF file and  user (B) Sign in another page sucessfuly. but in this case only one signature is verfied other one is unverfied.
So above scenario how we can verify digital Signature in PDF file after append new page?

What I have tried:

Please help to verify all digital Signature after Added a new Page in Signed PDF File.
Updated 23-Aug-21 21:36pm

1 solution

Changing a PDF file will invalidate any existing signatures on the file. That's the whole point of the signature.
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