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A conditional access system (CAS) only allows appropriate users to get access to contents. The advent of exchangeable CAS (XCAS) that updated version of CAS is developed. But the standards or evaluation schemes for XCAS are absent, so many interoperability problems among XCAS of each company may have to be occurred. Therefore, a specific scheme that can evaluate the security and suitability of exchangeable conditional access systems has been requested. In this paper, we propose an appropriate evaluation scheme for XCAS. The evaluation scheme includes an evaluation purpose and four components to evaluate the evaluation target, the evaluation process, the evaluation subject, and the evaluation cost involved. [ABSTRACT FROM AUTHOR]