Method for ensuring content protection and subscription compliance
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United States of America Patent
Stats
-
Apr 21, 2009
Grant Date -
Aug 1, 2002
app pub date -
Jan 8, 2002
filing date -
Jan 26, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for enforcing compliance in both the copy protect domain and service subscription domain for streamed multicast data. Each content is encrypted with a title key that itself is encrypted with a channel unique key which is a hash of a session key and a channel key. A compliant player is given the channel key upon registration for a subscription service (representing subscription protection) and is also given device keys upon activation (representing copy protection) for decrypting the session key. Consequently, the channel unique key can be obtained (and, hence, the content decrypted) only by a player that is compliant with both copy protection rules and subscription rules. The channel key can be refreshed periodically as subscriptions change or expire.
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