Composition and Design of DRM System

First,the paper proposes the definition,three elements and the basic principle of Digital Rights Management;Second,the paper introduces two key techniques of DRM,the encryption technology in Conditional Access System and the digital watermarking technology,and analyzes the Advantages and disadvantages of the two techniques;At last,in view of the flaws of the two techniques,the paper designs a DRM system based on Conditional Access and digital watermarking,which is mainly used for digital TV business.