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( en Inventor Geoffrey Rhoads Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number US10/286,517 Other versions US8505108B2 Google Patents US20040022444A1 - Authentication using a digital watermark US20040022444A1 - Authentication using a digital watermark
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