Identification document including embedded data

摘要

The present invention relates to coordinating information carried by a digital watermark and other machine-readable codes. In one implementation, an identification card includes a digital watermark and a barcode encoded with information. The digital watermark includes a hash of the barcode information. To determine authenticity of the identification card, the hash is compared with the barcode information. The card is considered authentic when the hash and barcode information match or otherwise satisfy a predetermined relationship.