| 摘要 |
A method ( 300 ) for providing conditional access to data. A conditional access system ( 24 ) is responsive to subscriber devices ( 14, 20 ), and the data ( 52 ) is stored on a recording medium ( 50 ) and encrypted using an encryption key ( 54 ) when the recording medium ( 50 ) is detachably coupled to a first subscriber device ( 14 ). The method includes: based on a request on behalf of a second subscriber device for access to the data, arranging ( 302 ) for the conditional access system to authenticate the second subscriber device; and arranging ( 304 ) for the conditional access system to transfer the encryption key to the second subscriber device. The encryption key is usable by the second subscriber device to decrypt the data when the recording medium is detachably coupled thereto, and access to the decrypted data by the second subscriber device is restricted in a manner specified by the conditional access system.
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