有条件接收系统通过对节目信息进行加扰从而达到对用户收取收视费用。
Conditional Access System (CAS) is used to charge the subscriber for subscribing fee by scrambling the program information.
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.
安全性是衡量有条件接收系统的重要指标，它直接取决于所采用的加扰算法和密钥分配算法。
Security is an essential factor of CAS, which mainly depends on scrambling algorithm and key distribution algorithm.
文章对机顶盒的软件结构进行了概述并重点介绍了前端控制软件、节目管理软件和有条件接收接口软件。
The STB software structure is described with focus on the software of front-end control, program management and CA interface.
针对数字电视有条件接收系统中的密钥分配，提出了一种基于椭圆曲线密码的分层访问控制密钥分配方案。
A key distribution scheme based on elliptic curve cryptography for Conditional Access System (cas) in Digital TV broadcast is proposed.
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.
专为沃尔沃收音机设计的天线系统可以在所有条件下提供最佳的接收效果。
Aerials specially designed for Volvo's radio units to provide the best reception under all conditions.
专为沃尔沃收音机设计的天线系统可以在所有条件下提供最佳的接收效果。
Aerials specially designed for Volvo's radio units to provide the best reception under all conditions.
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