Information recording apparatus having function of...

Details Information recording apparatus having function of... Information recording apparatus having function of...

2006-12-05

2006-12-05

Louis-Jacques, Jacques (Department: 2134)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C380S201000

Reexamination Certificate

active

07146507

ABSTRACT:
First information is divided into equal-size information pieces. Serial numbers are assigned to the information pieces, respectively. An encryption key is generated from a base number and a variable number varying for each of the information pieces. The base number is common to an information range managed by one licence. The first information is encrypted on a block-by-block basis in response to the encryption key to get encryption-resultant information for every predetermined minimum information unit smaller than the sizes of the information pieces. The encryption-resultant information is recorded on a recording medium. A determination is made as to logical addresses of heads of portions of the recording medium which are loaded with portions of the encryption-resultant information corresponding to the respective information pieces. Second information representing a correspondence relation between the determined logical addresses and the assigned serial numbers is recorded on the recording medium.

REFERENCES:
patent: 5805700 (1998-09-01), Nardone et al.
patent: 11-195269 (1999-07-01), None
patent: 11-509397 (1999-08-01), None
patent: 2001-184787 (2001-07-01), None
patent: 2003-110546 (2003-04-01), None
patent: WO97/14147 (1997-04-01), None
“Chapter 6 Content Channel Management and Protection”: Digital Transmission Content Protection Specification Revision 1.2 (Informational Version): Jul. 11, 2001: pp. 35-47.

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