Information recording medium, information recording...

Details Information recording medium, information recording... Information recording medium, information recording...

2007-03-27

2007-03-27

Edun, Muhammad (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047120, C369S047210, C369S059230

Reexamination Certificate

active

10531810

ABSTRACT:
An optical disk is provided that disables reproduction of sub-information even if the sub-information as a contents encryption key is recorded entirely onto another optical disk. Sub-information is recorded on the optical disk by deforming a recording mark slightly in accordance with a pseudo random number sequence that is obtained using as an initial value medium ID that is read out medium inherent information. This allows sub-information inherent in a medium to be recorded, and even if the sub-information is duplicated entirely to another optical disk, the illegally duplicated sub-information cannot be reproduced because of a difference in initial value of a pseudo random number sequence between media.

REFERENCES:
patent: 5661703 (1997-08-01), Moribe et al.
patent: 2006/0039262 (2006-02-01), Nagai et al.
patent: 1 058 254 (2000-12-01), None
patent: 11-102572 (1999-04-01), None
patent: 2001-77802 (2001-03-01), None
patent: 2001-357533 (2001-12-01), None
patent: WO 02/25645 (2002-03-01), None

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