Hi!
I need to verify all digital signatures on the existing PDF document. Is there any possibility to do it? The verification (in my case) means:
1) Get all digital signatures on the PDF
2) Check on each digital signature , whether the document wasn't changed (validity of the signature)
3) Check on each digital signature, whether the certificate is valid (this is not Spire.PDF's case, it's a standard .NET cryptography routine)
I would like to know how to solve the points 1 and 2. Could you help me, please?
Thanks for reply
Pavel