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This paper proposes a Conditional Access System (CAS) suitable for use in Terrestrial Digital Multimedia Broadcasting (T-DMB), based on an effective multiplexing method to provide encrypted T-DMB services. Specifically, the proposed multiplexing method for a CAS is designed to reduce the additional bit rate while assuring easy access to the designated encrypted services. Finally, the performance of the implemented CAS is confirmed through implementation and a broadcasting experiment under various service environments. In Terrestrial Digital Multimedia Broadcasting (T-DMB), video services and data services are multiplexed into a digital audio broadcasting ensemble frame; therefore, the Conditional Access (CA) process should be done at several protocol layers of T-DMB.
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