07945781 is referenced by 34 patents and cites 287 patents.

The presently claimed invention relates generally to digital watermarking and steganographic encoding. One claim recites a method of encoding a watermark in a digital signal. The method includes generating varying key bits; and encoding the varying watermark key bits in the digital signal as a watermark with reference to at least characteristics of the digital signal. The “digital signal” may represent audio, video or imagery. Another claim recites a system for encoding a watermark in a digital signal. The system includes a processor: i) to map pseudo-random key and processing state information to effect an encode/decode map; and ii) to encode a watermark in a digital signal using the encode/decode map and characteristics of the digital signal. Of course other combinations are provided and claimed as well.

Title
Method and systems for inserting watermarks in digital signals
Application Number
9/538493
Publication Number
7945781 (B1)
Application Date
March 30, 2000
Publication Date
May 17, 2011
Inventor
Geoffrey B Rhoads
West Linn
OR, US
Assignee
Digimarc Corporation
OR, US
IPC
G06K 9/20
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