| 摘要 |
A method for descrambling scrambled content data objects is provided to descramble at least a part of the scrambled content data objects by applying a decoding operation under a key partially induced from a first key. A method for descrambling scrambled content data objects includes the steps of: descrambling at least a part of the scrambled content data objects by adapting a decoding operation under a key which is partially induced from a content descrambling key; acquiring at least one content descrambling key from a message which is received from a condition access sub system(3) through a data communication channel; and decoding at least one encryption of data acquired from at least one content descrambling key through coupled channel keys, wherein the encryption is transmitted from the message. The method for descrambling the scrambled content data objects includes the step of: descrambling at least a part of the scrambled content data objects by adapting the decoding operation under a key which is partially induced from a first key.
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