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1引言 多媒体通信业务和计算机网络技术的迅猛发展给信息的广泛传播提供了前所未有的条件，同时也带来了新的问题：即对信息数字化产品 (如电子出版物、音频、视频、动画、图像产品等 )的侵权、盗版和随意篡改。因此，信息数字产品的安全传播 (如知识产权保护、电子商务支
1 Introduction The rapid development of multimedia communication services and computer network technologies has provided unprecedented conditions for the widespread dissemination of information as well as brought about a new problem: that digital information products (such as electronic publications, audio, video, animation, images Products, etc.) of infringement, piracy and casual tampering. Therefore, the safe dissemination of information digital products (such as intellectual property protection, e-commerce branch