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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.

syntaxbit index# of bitsmnemonic
table_id08uimsbf
section_syntax_indicator81bslbf
'0'91bslbf
reserved102bslbf
section_length1212uimsbf
transport_stream_id2416uimsbf
reserved402bslbf
version_number425uimsbf
current_next_indicator471bslbf
section_number488bslbf
last_section_number568bslbf
for i = 0 to N
  descriptor()64var 
next
CRC_32 32rpchof
Table section legend
Note: bit index is only indicated for the first time through the elementary stream loop.
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