| Summary: | 碩士 === 國立交通大學 === 電子工程系所 === 94 === In a digital TV system, the Conditional Access (CA) system is essential to protect digital contents from unauthorized use. However, an ordinary CA system has only the ability to restrict the access to certain material. It cannot provide a further protection and prohibit unauthorized uses after the content has been downloaded and descrambled. The goal of the thesis is to use the MPEG REL to implement both the CA and the rights management systems. We will show how one can use the MPEG REL to bridge the gap between a DVB system and a DRM system. In this thesis, we insert a license, according to MPEG-21 REL expressions, into the Service Information of a DVB bit stream. With this license, the operators can constrain the user’s operations on the content through the DRM system and the smart card. To demonstrate the method we propose, we implement two application examples to show that using the REL can achieve both conditional access protection of digital content and manage the utilization of digital assets. In addition to the usage control of the MPEG REL, we also propose a key management machine in our applications to protect the content from being illegal accessed.
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