Use a Secure Digital Key to Certify the Identity of the Author on a Digital Document or Message 

Document signing certificates provide trusted assurance of authentication for electronically transmitted documents by validating author and document. Digital certificates give customers confidence that the received documents originate from the recognized source and have not been forged or tampered with. 

Certification originates from the Adobe Certified Document Services (CDS) or the Certificate Authorities that are members of the Adobe Approved Trust List (AATL). Certification attests that the signer has been verified by Adobe for compliance to its requirements and that the certificate is on the protected hardware