From A for AGF Videoforschung to Z for zapping, the most important technical terms in video research are explained here.

CI (Common Interface)

CI is an abbreviation for Common Interface and describes a uniform physical interface in the set-top box. It enables CI modules to be inserted to activate encrypted programmes from different providers. CI Plus is a further development of CI and offers additional possibilities for programme providers. For example, HD+, a possibility to receive programmes in HD quality, is activated via the CI Plus slot of a television set or receiver.

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