Which technology enables cable operators to control access to certain services by encrypting the programming?

Which technology enables cable operators to control access to certain services by encrypting the programming?

• A. Conditional access
• B. Digital rights management
• C. Copy protection
• D. Content lock

Answer: (A)

Conditional access is the mechanism that lets a cable operator control who can view encrypted programming by tying decryption rights to subscriber entitlements. The headend encrypts channels, and the set-top box (often with a smart card) carries the subscriber’s entitlements. When authorized, the box gets the decryption key to descramble the signal; if not, the content stays scrambled. This setup lets operators grant or revoke access in real time as subscriptions start or end, which is essential for premium channels and on‑demand services. Digital rights management focuses on licensing across devices, not the broadcast access control used here; copy protection aims to prevent copying rather than restrict viewing, and content lock isn’t a standard term for cable access control.

Conditional access is the mechanism that lets a cable operator control who can view encrypted programming by tying decryption rights to subscriber entitlements. The headend encrypts channels, and the set-top box (often with a smart card) carries the subscriber’s entitlements. When authorized, the box gets the decryption key to descramble the signal; if not, the content stays scrambled. This setup lets operators grant or revoke access in real time as subscriptions start or end, which is essential for premium channels and on‑demand services. Digital rights management focuses on licensing across devices, not the broadcast access control used here; copy protection aims to prevent copying rather than restrict viewing, and content lock isn’t a standard term for cable access control.