07224819 is referenced by 147 patents and cites 105 patents.

A method for tracking media signals in multimedia content is provided by uniquely identifying the multimedia content with a digital watermark identifier. A video channel is preferably embedded with a first watermark identifier. The first identifier uniquely identifies the multimedia content or the content family. A second digital watermark is embedded in an audio channel of the multimedia content. The second digital watermark uniquely identifies a user or user device. When the multimedia content is found in an unauthorized or unexpected channel, the content can be traced back to its misappropriating source via the user identifier.

Title
Integrating digital watermarks in multimedia content
Application Number
10/277617
Publication Number
7224819 (B2)
Application Date
October 21, 2002
Publication Date
May 29, 2007
Inventor
Geoffrey B Rhoads
West Linn
OR, US
Brett Alan Bradley
Portland
OR, US
Brett T Hannigan
Portland
OR, US
Kenneth L Levy
Stevenson
WA, US
Assignee
Digimarc Corporation
OR, US
IPC
G06K 9/00
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