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For several decades, the most common content protection technology was associated with set-top boxes (STBs) that decrypted cable and satellite broadcasts for those who had paid their subscription. These are known as conditional access systems (CAS). Although these legacy technologies are gradually becoming outdated and will eventually need to be replaced, they’re still forming a considerable part of the content protection technology stack of traditional pay-TV operators, and maintaining backwards compatibility is important. Thus there is a need to support both traditional broadcast services and OTT services.