Certification is a stamp or raised seal placed on a copy of a legal document to confirm that the document is a true and correct copy of the original and that it is still in full force and effect. (putnam.com)
While it's not the jurisdiction in question, after a notorious fraud investigation, the following is true for New Jersey in the United States Birth certificates previously issued by the Jersey City / Hudson County Office of Vital Statistics (with the raised seal from Hudson County). (politics.stackexchange.com)
The original document (s) must either be acknowledged or sworn to and have an original signature of a Notary Public, Commissioner of Deeds, or, in the case of a Birth Certificate, the stamped signature of a Registrar of Vital Statistics with a raised seal. (www2.erie.gov)