1 Reply Latest reply on Jan 15, 2016 3:47 AM by Bernd Alheit

    Signature validity is unknown

    donnaheg Level 1

      I have a document digitally signed with Acrobat Pro 9.  In Adobe Reader, when I click on the signature to validate it, I get the message "signature validity is unknown".  How do I fix this?  Do I need an fdf file and how to get?