Conditional access tables [MPEG Syntax]
Conditional Access tables (CAT) are designed to deny general users access to premium or otherwise restricted content, and to establish protocols and systems to grant authorized users access.
As a practical matter, MPEG only establishes the data structure for CAT and leave the details up to MPEG users like ATSC, ARIB, DVB and SCTE.
Building upon the MPEG work, ATSC has established further protocols for terrestrial conditional access in ATSC A/70, but has largely left the implementation details up to the end-user.
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