Cannot Edit PDF anymore - signature says Rev. 1: Signed by Preflight Ticket Signature, help

Ever since Adobe updated I have not been allowed to make notes in my PDF because it says the signature does not give me authorization, however, for the past year I have been able to type text boxes, highlight and mark my pdf for notes. I look at the signatures and see "Rev. 1: Signed By Preflight Ticket Signature. It will not let me validate it or change it. I have a board exam coming up and need to take notes. How do I get rid of this?