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Beyond Cryptographic Conditional Access

Conditional access (CA) systems manage chargeable content (e.g., movies). Traditional CA systems use a smartcard as a cryptographic component that decrypts broadcast content for authorized recipients. Since that approach protects content by protecting cryptographic keys, it has two inherent weaknesses: It relies on the smartcard to protect universal secrets (i.e., the broadcast keys); and it cannot protect content from redistribution. This paper describes a noncryptographic conditional access system, where instead of protecting content directly, the content's identity is inserted as a watermark in the content and the CA smartcard is used as a licensing authority to authorize the display device to display watermarked content. This approach places a lower security burden on individual smartcards, and protects against the use of redistributed content.