| 摘要 |
At any time prior to a predetermined time T0 a consumer is able to request encrypted content data 27 from a content issuer 15, store it on their PC 33, and purchase or otherwise obtain a rights object or licence 36 including a decryption key for the data 27 from a rights issuer 17 using their mobile terminal 3. Before the predetermined time T0 the rights object 36 is stored on the mobile terminal 3 and is prevented from being transmitted to the PC 33. At the predetermined time T0 the mobile terminal 3 is able to send the decryption key contained within the rights object 36 to the PC 33 thus enabling the encrypted data 27 to be decoded. Only at this point does the data 27 become accessible to the consumer via the PC 33. The mobile terminal's secure and trusted clock is used to determine the time, thereby preventing unauthorized early decryption of and access to the content data 27. |
