Content data processing method, recording device, and...

Details Content data processing method, recording device, and... Content data processing method, recording device, and...

2003-04-02

2009-11-17

Truong, Thanhnga B (Department: 2438)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C380S277000, C380S278000, C380S281000, C713S193000

Reexamination Certificate

active

07620820

ABSTRACT:
The present invention provides a data processing method for encrypting or decrypting contents data using contents key data. The method comprises generating the reference information including data encrypted from contents key data using a plurality of device key data proper to a plurality of apparatus, by encrypting the contents key data using the device key data associated with those of the plural apparatus for which recording or reproduction is allowed, supplying the generated reference information along with the device key data to the plural apparatus, decrypting the contents key data from the supplied reference information, by the plural apparatus, using the device key data proper to the plural apparatus, and encrypting or decrypting the contents data using the decrypted contents key data.

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“Joho Security Kanzen System Q & A”, Electronics, Ohmsha, Ltd., May 1, 1996, vol. 41, No. 5, pp. 73 to 75.

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