Forensic digital watermarking with variable orientation and...

Details Forensic digital watermarking with variable orientation and... Forensic digital watermarking with variable orientation and...

2008-06-24

2008-06-24

Zand, Kambiz (Department: 2134)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S170000

Reexamination Certificate

active

07392392

ABSTRACT:
The invention provides a method of forensic digital watermarking that randomly selects an orientation and/or embedding protocol for a forensic digital watermark signal to be embedded in the content signal. It then embeds the forensic digital watermark signal at the selected orientation in the content signal. The embedding applies a different orientation to the digital forensic watermark for each instance of embedding a forensic watermark. This thwarts averaging and over-embedding attacks and enables generational forensic tracking.

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Response filed on Nov. 27, 2006, in applicant's EP Application No. 02797258.7.

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