| 摘要 |
Delivery of licenses (142) in a closed distribution system including a playback device (120) and secure processor (110). The secure processor (110) allows only use of authorized content (131), and the playback device (120) is authorized to execute content (131). A user (150) requests a license (142) to selected content (131) using a communication link, without the playback device (120), outside the closed content system to a license server (140). The user (150) requests licenses (142) using SMS, sending small amounts of information, possibly including proofs of purchase. The server (140) responds using SMS, providing the user (150) with a code representing information interpretable as a license, such as an encrypted content key or a shared secret known to the user (150). The user (150), using a keypad or other device (122), inputs that code to the playback device (120), which determines if it authorizes use of the content (131). The playback device (120) authenticates the license (142), determining whether that license (142) authorizes the use (150) for the content (131), and enforces the licensed rights. |
