The Authentication Certificate means the document conforms to the requirements of the County Clerk in terms of the Notarial Verbiage of the document. Most importantly, the Notary Public is a valid Notary and their signature matches the signature on file on their Commission or Good Character Card. Also, Official signatures on Vital Records such as birth, marriage, death, and divorce decrees are Authenticated at the County Clerk as well.
If the document in question is an educational record, the applicant must have the signature of the notary public thereon (notarizing the signature of an educational official) authenticated by the County Clerk. The authenticating County Clerk must be the County Clerk of the county in which the notary public is qualified.