Method and apparatus for use of a time-dependent watermark...

Details Method and apparatus for use of a time-dependent watermark... Method and apparatus for use of a time-dependent watermark...

2005-08-23

2005-08-23

Darrow, Justin T. (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S165000, C713S176000, C713S178000, C380S201000, C380S203000, C705S051000, C705S057000

Reexamination Certificate

active

06934851

ABSTRACT:
A copy protection system for protecting content wherein a ticket and a watermark are created, utilizing a first time reference (TD) and a one-way function, to indicate the copy protection status of the content. A source device produces the ticket and watermark using a first time reference and a hashing function. The source device provides a data stream containing the content, the ticket, the watermark, and the first time reference (TD) to the receiver device. The receiver device determines if the first time reference (TD) is contained within a time window determined by a second time reference. When, the first time reference (TD) is contained within the time window, the receiver compares the ticket to the watermark using the first time reference (TD) and the one-way function, and based on the comparison, produces a signal indicating the copy protection status of the content.

REFERENCES:
patent: 6185312 (2001-02-01), Nakamura et al.
patent: 6209092 (2001-03-01), Linnartz
patent: 09326166 (1997-12-01), None
patent: WO9743761 (1997-11-01), None
patent: WO9743853 (1997-11-01), None
patent: WO9833325 (1998-07-01), None
patent: WO9844402 (1998-10-01), None

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