Does Aspose PDF support digital signing a PDF that already has a digital signature without invalidating the first signature? I believe this is referred to as Serial Signing
Example: A PDF is authored by a third party and signed to authenticate the author. We want to append some additional information then apply our signature. We would like both signatures to be intact, the signature on the original portion of the document and the signature on the whole (outer) document.
iText supports this as it supports PAdES (PDF Advanced Electronic Signatures)
Example: A PDF is authored by a third party and signed to authenticate the author. We want to append some additional information then apply our signature. We would like both signatures to be intact, the signature on the original portion of the document and the signature on the whole (outer) document.
iText supports this as it supports PAdES (PDF Advanced Electronic Signatures)