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Co-Signing a PDF

Can you explain the correct way to add a co-signature to a PDF. Currently I am adding a digital signature to each page of a PDF using the default method(Adds a field titled Signature1). I am storing this PDF in a database and need to add a co-signer signature at a later date. I have tried opening the document and adding a new signature field on each page and then applying a signature but it seems to corrupt/invalidate the first signature. Do I need to add the co-sign field at the time I am adding the original signature?


Hi Fred,

I would like to inform you that Aspose.Pdf.Kit for .NET allows you to add multiple signature fields, which can later be signed with multiple signatures. Please see the following article for details:
Improved and Flexible PDF Signing Mechanism

I hope this helps. If it doesn’t satisfy your requirement then please do let us know.