Thank you for reaching out. As discussed on Stackoverflow, Adobe is not strictly following the PDF standard when it comes to signature validation, which in the past has left it open to some attacks and spoofs.
This is why we have the e_compatibility_and_archiving option to allow some relaxation of validation, rather than the preferred/safer e_maximum option.
Dear @Ryan, thank you for reaching out to me. I’ve been very busy with the project lately. Basically, it requires me to add multiple digital signatures to a PDF file indicating multiple people has approved the document. I’m also using self-signed certificate for each signature. Can you tell me if there’s a way I can add multiple signatures without causing a verification failure? I really hope there is a solution to this issue.