介绍了在VOD系统中有条件接收的原理和实现方法，并讨论了一些关键技术。
This paper introduces the theory of conditional access and its implement in the system of VOD service. Some technical points are also discussed.
有线电视网络的有条件接收虽然是基于单向网络构建的，但是对节目的授权是粗粒度的。
Though the conditional receivable in cable TV network is constructed on unidirectional network, the authorization for the programmer is granular.
在IPTV平台上集成有条件接收系统将会保护IPTV内容提供商的合法权益，也是实现其产业化的前提条件。
Integrating Conditional Access System in IPTV platform can protect the rights and interests of IPTV content providers, also a precondition of implementing its industrialization.
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