This letter 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.
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