The Hahnemühle Certificate of Authenticity is designed to protect the s ecurity and exclusivity of your limited edition art works and reproductions, and reduce the risk of forgery. Each certificate has a serialized numerical hologram already affixed to the certificate. The certificate canthen have your customised design and wording printed onto it, eg: description of art work, publisher, artist, edition number and date, through inkjet, laser, thermal transfer or offset litho printing.