Digital watermark methods for encoding auxiliary data into a host signal are used to
authenticate physical and electronic objects. In one implementation, an identification …

Stationery, or other printable media, is encoded with a digital watermark. The watermark is
not conspicuous to a human observer of the media, yet conveys plural bits of auxiliary …

With the advent of computer networks and digital multimedia, protection of intellectual
property has become a prime concern for creators and publishers of digitized copies of …

2008-11-05 Assigned to DIGIMARC CORPORATION (FORMERLY DMRC CORPORATION)
reassignment DIGIMARC CORPORATION (FORMERLY DMRC CORPORATION) …

US PATENT DOCUMENTS 6,664.976 B2 12/2003 Lofgren et al. 6,847,883 B1 1/2005
Walmsley et al. 5,502,576 A 3/1996 Ramsay et al. 6,950,519 B2 9, 2005 Rhoads 5,664,018 …

(54) METHODS FOR AUDIO WATERMARKING 4,495,620 A 1/1985 Steele et 81. AND
DECODING 4,528,588 A 7/1985 Lofberg 4,672,605 A 6/1987 Hustig et al.(75) Inventor …

3,838,444 A 9/1974 Loughlin et al. A watermarking method converts a watermark message
into 3,845,391 A* 10/1974 Crosby........................ 325/64 a Frequency Shift Keying (FSK) …

US9710871B2 - Geometric enumerated watermark embedding for spot colors - Google Patents
US9710871B2 - Geometric enumerated watermark embedding for spot colors - Google Patents …

Embedding a watermark includes identifying watermark locations in the data stream,
partitioning the identified water mark locations into watermark location blocks each to be …

5,915,027 A* 6/1999 Cox et al...................... 380/54 5.991, 426 A* 11/1999 Cox et
al.................... 382/100 5,995.426 A* 11/1999 Cowles et al............... 365/201 6,069,914 A …