Data usage controlling apparatus that prevents the...

Details Data usage controlling apparatus that prevents the... Data usage controlling apparatus that prevents the...

2006-07-11

2006-07-11

Revak, Christopher (Department: 2131)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

Reexamination Certificate

active

07076668

ABSTRACT:
A data usage controlling apparatus that reads a type 1 key from a storage unit and (a) main data, (b) a type 2 key that has been encrypted using the type 1 key, and (c) condition information that has been encrypted using the type 2 key from a recording medium, decrypts the condition information using the type 2 key, and controls usage of the read main data in accordance with the decrypted condition information. In accordance with usage of the main data, the decrypted condition information is updated, a new type 2 key is generated, and the stored type 1 key is updated. The updated condition information is encrypted using the new type 2 key and used to replace the encrypted condition information on the recording medium. The new type 2 key is encrypted using the updated type 1 key and used to replace the encrypted type 2 key on the recording medium.

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