Digital watermark with variable location

Details Digital watermark with variable location Digital watermark with variable location

2003-01-31

2009-12-22

Smithers, Matthew B (Department: 2437)

Cryptography

Video cryptography

Copy protection or prevention

C380S044000, C380S232000, C713S176000, C713S179000

Reexamination Certificate

active

07636440

ABSTRACT:
A digital watermark in a data file occurs at multiple locations within the file. The location of each digital watermark, other than a first digital watermark, is specified by a previous digital watermark, or by other auxiliary information in a same logical block as a previous digital watermark.

REFERENCES:
patent: 2002/0099943 (2002-07-01), Rodriguez et al.
patent: 2002/0146123 (2002-10-01), Tian
patent: 2003/0215110 (2003-11-01), Rhoads et al.
patent: 2004/0034778 (2004-02-01), Celik
patent: 0928110 (1999-07-01), None
patent: 0899688 (2001-01-01), None
patent: 1617643 (2006-01-01), None
patent: 2003-078515 (2003-03-01), None
Hao-hua Chu, Lintian Qiao, Klara Nahrstedt, Hua Wang, Ritesh Jain, “A secure multicast protocol with copyright protection”,Apr. 2002, SIGCOMM Computer Communication Review , vol. 32 Issue 2, Publisher: ACM, pp. 42-60.
Foreign Search Report dated Jun. 15, 2004 for GB application No. GB040050838.

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