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Pay per view - a multimedia multicast application with effective key management

机译：按次付费-具有有效密钥管理的多媒体多播应用程序

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Multicast communications seem particularly well adapted for large scale commercial distribution applications, such as pay per view systems. Successful implementation of pay per view systems is underway in many countries, and as a result, many cable companies have to replace their distribution networks. Conditional access system is the essential basis of a pay-TV system to charge the subscriber for the subscribing fee, and key management is the essential part of a CAS. The problem of controlling access to multimedia multicasts requires the distribution and maintenance of keying information. The conventional, approach employs the use of a media-independent channel. We propose an approach that involves the use of a media-dependent channel, and is achieved by using data embedding techniques. In this paper, four levels of key hierarchy for CAS are discussed which reduce the complexity of key distributions. Finally, we introduce multilayer applications where group members may subscribe or cancel membership to some layers while maintaining membership to other layers.
机译：组播通信似乎特别适合于大规模商业发行应用，例如按次计费系统。在许多国家/地区，正在成功实施按次计费系统，因此，许多有线电视公司不得不更换其分销网络。有条件访问系统是付费电视系统向订户收取订阅费的基本基础，而密钥管理是CAS的基本组成部分。控制对多媒体多播访问的问题需要分发和维护密钥信息。常规方法采用与媒体无关的频道。我们提出一种方法，该方法涉及使用依赖媒体的渠道，并且可以通过使用数据嵌入技术来实现。本文讨论了CAS的四个层次的密钥层次结构，它们降低了密钥分发的复杂性。最后，我们介绍了多层应用程序，其中组成员可以订阅或取消某些层的成员资格，同时保持其他层的成员资格。

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