| 摘要 |
A client device includes a network interface that transmits a request for the media content to the sanction server, receives second sanction data from the sanction server, transmits second cryptographic data to the caching server, receives first cryptographic data from the caching server and that receives scrambled media content from the caching server. A random number generator generates a random number. A client processing module, in response to the second sanction data, generates the second cryptographic data based on the random number and the second sanction data, generates a scrambling control word based on the second sanction data and the first cryptographic data and descrambles the scrambled media content based on the scrambling control word.
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