The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2003
Filed:
Aug. 06, 2001
Neil Lofgren, White Salmon, WA (US);
Stephen K. Decker, Lake Oswego, OR (US);
Hugh L. Brunk, Portland, OR (US);
J. Scott Carr, Tualatin, OR (US);
Digimarc Corporation, Tualatin, OR (US);
Abstract
The present invention relates to digital watermarks integrated into holograms, watermarked hologram structures, and related applications as an authentication technique. One method creates a watermark image, and then embeds the watermark image into a holographic structure. The holographic structure is carried by a smart card. The smart card includes additional information. In one embodiment, the digital watermark includes information bits, and these information bits are used to authenticate the hologram, or the smart card. In another embodiment, the watermark's information bits are compared with the additional information carried by the smart card. The result of the comparison is used to authenticate the smart card or the hologram.