4 Replies Latest reply on Apr 6, 2015 5:05 PM by IsakTen

    What are the types of signatures? PDF 1.7 Reference says there are 3 of them but everywhere else there are only 2. Where did usage rights signature disappear?


      PDF Reference (http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/PDF32000_2008.pdf) says there are 3 types of signatures:

      - approval signature

      - certification signature

      - usage rights signature

      But everywhere else I can find only first 2 types. Could someone tell me why, please? I'm writing thesis about PDF security mechanisms.

      Thank you.