Multi-Sign and certify pdf

[btompkinson1]

You can only have one certification/author signature per document, so you see your exception message when you attempt to add another. Here is a link that describes the different types of digital signatures that can be added using PDFNet and signing multiple fields:

What are the different types of digital signatures that can be added to a PDF using PDFNet?

Answer: There are three types of digital signatures in a PDF. Certification/Author Signature : Zero or One Approval/Recipient Signatures : Zero to Many Document Timestamping Signatures : Zero to Many Our DigitalSignature sample shows the three types of signatures. https://docs.apryse.com/documentation/samples#digitalsignatures static bool CertifyPDF() // shows adding Author signature (can only call once on a document) static bool SignPDF() // shows adding an Approval signature (you can h…