Answer Posted / libin lal vinu

(b) Conditional Access System



http://www.rediff.com/money/2006/sep/05iycu.htm

CAS stands for conditional access system, which is a digital
mode of transmitting TV channels trough a set-top box (STB).
The transmission signals are encrypted and viewers need to
buy a set-top box to receive and decrypt the signal. The STB
is required to watch only pay channels, not free-to-air
channels, like Doordarshan

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