Television encryption: Difference between revisions - Wikipedia

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==Conditional access==

===Cable and early satellite television encryption===

[[Image:Scrambled cable channel.jpg|thumb|A scrambled cable channel (possibly VideoCipher II or Oak ORION) as viewed without a decoder. The scrambled image is an old version of the [[Paramount Pictures]] logo.]]

[[Analog television|Analog]] and [[Digital television|digital]] pay television have several [[conditional access]] systems that are used for [[pay per view]] (PPV) and other subscriber related services. Originally, analog-only cable TV systems relied on set-top boxes to control access to programming, as television sets originally were not "[[cable-ready]]". Analog encryption was typically limited to premium channels such as HBO or channels with adult-oriented content. In those cases, various proprietary video synchronization suppression methods were used to control access to programming. In some of these systems, the necessary synch signal was on a separate subcarrier. Analog set-top boxes have largely been replaced by digital set-top boxes that can directly control access to programming as well as digitally decrypt signals.