Does anyone out there know if there is a practical way to sign PDFs to enable me at a later date to determine if a PDF has been tampered with?
I know you can password protect them etc but what I want to be able to do is create a PDF and then if needed at a later date get that PDF back from a client and verify that the signature is mine (or my companies), and that they aren't using a modified (or otherwise regenerated) PDF.
Preferably this could be done with existing GPG (PGP) Keys.
I'm a compulsive post editor, you might wanna wait until my post has been online for 5-10 mins before quoting it as it will likely change.
I know I seem harsh in some of my replies. SORRY! But if you're doing something illegal or posting something that seems to be obvious BS I'm going to call you on it.
A third party security audit is the IT equivalent of a colonoscopy. It's long, intrusive, very uncomfortable, and when it's done, you'll have seen things you really didn't want to see, and you'll never forget that you've had one.