| 摘要 |
A Set Top Box (STB) or client computer includes a communication interface operable to receive digital messages and digital content, memory operable, and processing circuitry coupled to the communication interface and to the memory. The STB is operable to receive a digital message, extract a key portion from the digital message, decrypt the key portion, descramble the digital content using the decrypted key portion, extract a rights portion from the digital message, decrypt the rights portion, determine protected and unprotected digital content based upon the rights portion, write the unprotected digital content to an unprotected portion of the memory, and write the protected digital content to a protected portion of the memory. The decrypted key portion may include a plurality of Program IDs (PIDs) and the decrypted rights portion may include protection data for each PID. A security processor may prevent a central processing unit from accessing the protected portion of the memory.
|
