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数字拷贝具有100％的保真性,而模拟电影每拷贝一次质量就下降一次。为了保护软件、电影、音乐版权者的利益,由“4C”(Intel,IBM,Matsushita,和Toshiba)协同拷贝保护技术工作组(CPTWG)共同开发了“内容保护系统体系”(CPSA--Content Protection System Architecture),为DVD家族产品建立了内容保护和访问控制的框架,它涵盖了加密、水印、模拟和数字输出保护等技术。DVD的拷贝保护有如下几种:1)模拟拷贝保护系统(Analog CPS-Analog Copy Pro-tection System) Macrovision公司开发的模拟拷贝保护系统是用来防止从连续电影的数字传输或数字复制品(磁带、
Digital copies have a fidelity of 100%, while analog movies drop once per copy. To protect the interests of software, movie and music copyright holders, CPSA (Content Protection System) was jointly developed by 4C (Intel, IBM, Matsushita, and Toshiba) Collaborative Copy Protection Technology Working Group (CPTWG) System Architecture, a framework for content protection and access control for the DVD family of products that encompasses technologies such as encryption, watermarking, analog and digital output protection. There are several types of copy protection available for DVDs: 1) Analog Copy Protection System Analogvision Copy Protection System developed by Macrovision is designed to prevent digital or digital copies of continuous movies (tapes ,