Where can I get a digital certificate that I can use with Adobe Acrobat that does not require a USB hardware key?
I have been able to sign PDF documents with Adobe Acrobat versions 6 and 9 with my code signing certificate. When I use my code signing certificate Acrobat says the validity of the document certification is unknown.
Per existing standards (RFC 5280) code signing certificates may not be used for signing. For a number of versions Acrobat had a bug that ignored this requirement. Starting with version 11.0.07 Acrobat (and Reader) enforces this requirement.