Verifying Digital Signatures - Help!

Question

I have a fillable PDF with multiple digital signature fields.  I checked the signatures panel on one of the documents I saved and none of the digital signatures have been validated, signer's identity is unknown etc.  I'm pretty sure it's important they are validated when they are digitally signed.  The last digital signature applied by the manager locks the PDF, not sure if that matters.  On the original document I checked out Preferences,  Signature Panel, Vertification and Verify signatures when the document is opened is ticked off.  Why are the signatures not verifying after the signatures are added to the PDF?  Please help me.

Steve Cordero · Accepted Answer

Yes, Adobe Approved Trusted List signing certificates provided by the AATL vendors are trusted by default in Acrobat.

Steve Cordero · Answer

It's likely that each of the Signatores has used a self-signed certificate rather than one provided by one of the certificate vendors in the Adobe Approved Trusted List .  If the signatures are self-signed, then you probably have not trusted the Signatores self-signed certificate.   In this case, the message that the certificate validity is "Unknown" is telling you that by this response.  If the Signatores had a certificate that was distributed by one of the Adobe Approved Trusted List vendors then Acrobat/Reader would say the certificate was "Valid" in most cases.

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