Because some states prohibit Notaries from certifying copies of documents, a useful alternative is the practice of copy certification by document custodian. In this procedure, the person who possesses both the original document and a copy signs a written declaration noting that the copy is identical to the original. The document holder then takes an oath or affirmation before the Notary.
The custodian's signature is then notarized on the written declaration using jurat wording. In essence, a copy certification by document custodian is an affidavit signed and sworn to by the custodian with a jurat as the notarization.