All SignatureAPI PDF deliverables are sealed with a cryptographic signature created using one of these public key certificates:

The easiest way to verify that a deliverable was generated by SignatureAPI is to open it in Adobe Acrobat Reader (free) or Adobe Acrobat (paid).

First, check that the signature is valid. You should see a signature icon with a green check mark and the message, “Signed and all signatures are valid.”

Next, open the Signature Panel and review the signature information.