The thesis developed an embedded platform for the networked video communication terminals and implemented the hardware modules of video capturing, encoding-decoding and real-time network communicating based on TI s digital media DSP DM642.

A discussion on a new-typed digital media security supporting platform;

On the Innovation of Content Regulation System of Digital Media in China;

An Introduction to Content Regulation of Digital Media in America and Britain;

Semantically secure digital multimedia cryptosystem;

For implementing the encryption/decryption and information hiding for digital multimedia,and aiming to generate enough large cipher key space,the accurate period of high dimension random matrix scrambling transformation is studied with the help of number theory and algebraic theory.

Starting from a general introductio n of the concepts of information hiding and digital watermarking technology and the fundamental principles,if focuses on representing some typical applications and useful algorithms of information hiding technology to digital multimedia includ ing text, image, audio and video.