Digital broadcasting based on home servers is a term describing new broadcasting services offered by utilizing a receiver with storage. The services include program viewing that does not depend on normal broadcasting hours and highlight viewing that uses program-related information called metadata. Preventing unauthorized use of stored programs is a critical issue in these services. It is extremely easy to edit programs that the broadcaster requires by using a program usage control mechanism. We propose an advanced Conditional Access System (CAS) for the new digital broadcasting using metadata. It achieves a secure environment for content and metadata by preventing tampering and ensuring that only metadata certificated by the broadcaster can be utilized. We also developed a prototype receiver on a PC and an advanced CAS card on a Java Card to evaluate the system. We confirmed through on the implementation experiment that the advanced CAS could be utilized in broadcasting services.
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