Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2005-10-18
2005-10-18
Smithers, Matthew (Department: 2137)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C380S201000
Reexamination Certificate
active
06957343
ABSTRACT:
In one aspect of the invention is a method for preventing unauthorized copies of a medium, such as a DVD, from being played by a compliant device by using the validation area (VA) region of a medium to validate keying material. A compliant device is a device that will validate keying material. In one embodiment of the invention, a compliant device validates keying material by using the value in the VA region of the medium. In alternative embodiments, a compliant device will validate keying material by checking correspondence between keying material written to a non-VA region of a medium and validation data written to a VA region of a medium. In the alternative embodiments, if the keying material does not correspond to the validation data, then a compliant device will prevent the contents of the medium from being played.
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PCT/US 02/08971, filing date: Mar. 22, 2002, 8 pages.
Ripley Michael S.
Traw C. Brendan S.
Hope Libby H.
Intel Corporation
Smithers Matthew
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