When I open a document that has been digitally signed, I keep getting a message saying "Signature validity is unknown."
How do I change this, so that every time I open the document it says "Signature is valid?"
This is what I have tried so far that doesn't work:
I was able to enable the "Trust Manager" button (by selecting Edit-> Preferences -> Signatures -> Verification -> More... and then checking "When document has valid, but untrusted signatures, prompt to review and trust signers) and add each signature into my trusted contacts, but is this the correct way to do it? This only seems to work in Acrobat XI, what do you do if you open the document in X or an earlier version of Acrobat?
Is there a way the signer can send a document so that anyone who opens it will get the "Signature is valid" message?
Joining the Adobe Approved Trust List isn't something that seems like a good fit for this issue unless you belong to a large organization. Is it possible to encrypt the root certificate or the validity into a document that is digitally signed when you send it? So that the signature will be marked "valid" when someone else opens it?
The root certificate for your signature is not trusted. I do not know if it is present in the Adobe Approved Trust List. If it isn't updating this list would not help. Joining Adobe Approved Trust List is always a good idea regardless of the organization size. See signature validation unknown for more info.