sign digitally a pdf
hello.i have a project where i need to create an electronic invoice system, basicly i need to send to the clients a pdf invoice, and this pdf must be signed using a x.509v3 certificate.does anyone has a few tips where to look around(papers, books, API's, etc)?thanks.
ok..i was already at that page, but since i din't saw a mentionan to x509 certificate, i though the package didn't suited my interests.am i confused?thanks.