I think you can use pretty much any certificate to sign PDFs - there is a separate option to certify PDFs that does indeed require special certificates and use

I think you can use pretty much any certificate to sign PDFs - there is a separate option to certify PDFs that does indeed require special certificates and use of HSMs: https://helpx.adobe.com/acrobat/using/certificate-based-signatures.html#certifying_and_signing_documents https://helpx.adobe.com/acrobat/using/certificate-based-sign... Edit: As an aside, it is amazing the number of people who think that PDFs can't be edited (and are amazed when even MS Word can do it these days).