User attribute data, such as a retinal scan, is encoded into a media signal as it is captured in media capture device, such as a camera, video recorder, etc. The user attribute data uniquely associates the creator with the content he or she creates. By steganographically embedding the user attribute...http://www.google.fr/patents/US7043048?utm_source=gb-gplus-shareBrevet US7043048 - Capturing and encoding unique user attributes in media signals
Capturing and encoding unique user attributes in media signals
