Public key media key block

Information security – Prevention of unauthorized use of data including prevention... – Access control

Reexamination Certificate

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Details

C713S193000

Reexamination Certificate

active

07845015

ABSTRACT:
Protected content distribution is accomplished by a first entity generating a set of asymmetric key pairs, creating a plurality of sets of private keys by selecting a combination of private keys from the set of asymmetric key pairs for each created set, and distributing the sets of private keys to playback devices. A second entity produces protected content including encrypted content and a public key media key block, encrypts a symmetric content key with each public key in the set of asymmetric key pairs to form the public key media key block and encrypts a content title with the symmetric content key to form the encrypted content. A playback device stores one set of private keys, receives the protected content, and decrypts and plays the content title stored in the protected content when a selected one of the set of private keys stored by the playback device successfully decrypts the encrypted symmetric content key stored in the public key media key block of the received protected content.

REFERENCES:
patent: 5883958 (1999-03-01), Ishiguro et al.
patent: 6950948 (2005-09-01), Neff
patent: 7017064 (2006-03-01), Thomas et al.
patent: 7089426 (2006-08-01), Bagshaw
patent: 7131004 (2006-10-01), Lyle
patent: 2002/0147906 (2002-10-01), Lotspiech et al.
patent: 06-244832 (1994-09-01), None
patent: 10-65662 (1998-03-01), None
patent: 11-220462 (1999-08-01), None
patent: 2000-148939 (2000-05-01), None
patent: 2002-271314 (2002-09-01), None

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