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scrambled cable channel ~~(possibly VideoCipher II or Oak ORION and the horizontal and vertical synch signal has been replaced by digital data with the effect that the picture is not properly displayed on the TV screen.)~~ as viewed without a decoder.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 Analog set-top boxes have largely been replaced by digital set-top boxes that can directly control access to programming as well as digitally decrypt signals.