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详细分析了MPEG-2和DVB支持条件接收的机制,着重讨论了条件接收系统的安全技术和兼容技术,对加扰控制位的含义、控制字的变化、以及加扰的两个层次提出了建议。
The mechanism of MPEG-2 and DVB support condition reception is analyzed in detail, and the security technology and compatible technology of conditional access system are emphatically discussed. Some suggestions are put forward such as the meaning of scrambling control bits, the change of control words and the two levels of scrambling .