| 摘要 |
A computerized device can implement a content player to access a content stream using a network interface, the content stream comprising encrypted content and an embedded license comprising a content key encrypted according to a global key accessible by the content player. The content player determines whether a token meeting an authorization condition is present and uses the global key to decrypt the content key only if such a token is present. The authorization condition may be evaluated at least in part based on data included in the content stream. The authorization condition can include presence of a token having a content ID matching a corresponding ID in the license; presence of a token with a correct device ID; presence of a token signed according to a digital signature identified in the licenses; and/or presence of a token that is unexpired, with expiration evaluated based on a time-to-live indicator in the token.
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