Read/write media key block

Details Read/write media key block Read/write media key block

2011-06-28

2011-06-28

Patel, Nirav B (Department: 2435)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C380S201000

Reexamination Certificate

active

07971070

ABSTRACT:
A recorder system contains a media key block (MKB) and selectively writes protected content into a recording medium according to the following content protection logic, to combat theft of the protected content: If the medium does not have a MKB, then the recorder writes its stored MKB into the medium and writes protected content into the medium. If the medium has a MKB that is older than the stored MKB in the recorder, then the recorder writes its stored MKB into the medium before re-encrypting and writing protected content into the medium. If the medium has a MKB that is newer than the stored MKB, then the MKB in the medium is used for content protection. The recorder may store the newer MKB in non-volatile memory, effectively updating its previous stored MKB, so the recorder will have the most recently observed MKB for content protection use.

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