1
Geoffrey B Rhoads, Ammon E Gustafson: Watermark embedder and reader. Digimarc Corporation, Joel R Meyer, Digimarc Corporation, September 2, 2003: US06614914 (705 worldwide citation)

A watermark system includes an embedder, detector, and reader. The watermark embedder encodes a watermark signal in a host signal to create a combined signal. The detector looks for the watermark signal in a potentially corrupted version of the combined signal, and computes its orientation. Finally, ...


2
Geoffrey B Rhoads, Ammon E Gustafson: Digital watermarking employing both frail and robust watermarks. Digimarc Corporation, William Y Conwell, Digimarc Corporation, June 3, 2003: US06574350 (229 worldwide citation)

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Ap ...


3
Geoffrey B Rhoads, Ammon E Gustafson: Methods and systems using multiple watermarks. Digimarc Corporation, William Y Conwell, Digimarc Corporation, October 21, 2003: US06636615 (207 worldwide citation)

Two or more digital watermarks, with different characteristics, are embedded in a document. The characteristics are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the wa ...


4
Geoffrey B Rhoads, Ammon E Gustafson: Methods and systems using multiple watermarks. Digimarc Corporation, Steven W Stewart, Digimarc Corporation, April 27, 2004: US06728390 (124 worldwide citation)

Two or more digital watermarks, with different characteristics, are embedded in a document. The characteristics are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the wa ...


5
Geoffrey B Rhoads, Ammon E Gustafson: Methods and systems using multiple watermarks. Digimarc Corporation, Steven W Stewart, Digimarc Corporation, June 1, 2004: US06744906 (104 worldwide citation)

Two or more digital watermarks, with different characteristics, are embedded in a document. The characteristics are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the wa ...


6
Geoffrey B Rhoads, Ammon E Gustafson: Inferring object status based on detected watermark data. Digimarc Corporation, Digimarc Corporation, May 30, 2006: US07054462 (103 worldwide citation)

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Ap ...


7
Geoffrey B Rhoads, Ammon E Gustafson: Methods employing multiple watermarks. Digimarc Corporation, Digimarc Corporation, February 1, 2005: US06850626 (93 worldwide citation)

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Ap ...


8
Geoffrey B Rhoads, Ammon E Gustafson: Method for utilizing fragile watermark for enhanced security. Digimarc Corporation, Digimarc Corporation, January 30, 2007: US07171020 (73 worldwide citation)

A fragile watermark is embedded in a document. The fragile watermark provides enhance security. In one implementation, a method is provided for embedding information in an image so that the image will have different information when a scanning or printing process reproduces the image. The method inc ...


9
Geoffrey B Rhoads, Ammon E Gustafson: Data encoding using frail watermarks. Digimarc Corporation, Digimarc Corporation, May 30, 2006: US07054463 (65 worldwide citation)

Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Ap ...


10
Geoffrey B Rhoads, Ammon E Gustafson: Multiple watermarks in content. Digimarc Corporation, September 4, 2007: US07266217 (65 worldwide citation)

Image, video, and/or audio data is encoded with at least first and second watermarks. In one implementation a method includes: receiving content; embedding a first watermark signal in the content; compressing the content; embedding a second watermark signal in the content. The first watermark signal ...