In those cases, various proprietary video synchronization suppression methods were used to control access to programming. Analog encryption was typically limited to premium channels such as HBO or channels with adult-oriented content. Originally, analog-only cable television systems relied on set-top boxes to control access to programming, as television sets originally were not 'cable-ready'. Analog and digital pay television have several conditional access systems that are used for pay-per-view (PPV) and other subscriber related services.
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