Conditional access: Difference between revisions

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'''Conditional access''' (abbreviated '''CA''') or '''conditional access system''' (abbreviated '''CAS''') is the protection of content by requiring certain criteria to be met before granting access to the content. The term is commonly used in relation to [[digital television]] systems.

==In Digital Video Broadcasting==

Under the [[Digital Video Broadcasting]] (DVB) standard, conditional access system (CAS) standards are defined in the specification documents for DVB-CA (conditional access), [[Common Scrambling Algorithm|DVB-CSA]] (the common [[Scrambler|scrambling]] algorithm) and [[DVB-CI]] (the [[Common Interface]]). These standards define a method by which one can obfuscate a digital-television stream, with access provided only to those with valid decryption [[smart cards|smart-cards]]. The DVB specifications for conditional access are available from the [http://www.dvb.org/technology/standards/index.xml#conditional standards page on the DVB website].