Conditional access system (CAS) is the key to realize the increment of the DVB system and provides effective system management and subscriber control.

条件接收系统(CAS)是DVB系统实现增值的核心，能够提供有效的系统管理和用户控制。

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This thesis pays emphasis on analyzing the system structure and system flow, the core techniques, the channel characteristic and parameters of DVB system.

本文重点分析了DVB系统结构流程，核心技术及系统信道特性和参数。

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In this paper, a method of transmission multimedia data in DVB system is presented, giving the distributing principle of PID, the organizational structure of multimedia data and algorithmic.

提出了一种在DVB系统传输多媒体数据的方法，并给出了PID分配原则、多媒体数据组织结构及实现算法。该方法实现了在MPEG2传送流中同时传输多媒体数据与数字视频。

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