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The CAS Registry Number is similar to a telephone number and has no significance in terms of the chemical nature or hazards of the material. The CAS Registry Number can be used to locate additional information on the material, for example, when searching in books or chemical data bases.
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. The CAS Bill and what it means. In the new system, Indian broadcasting companies will decide which channels would be 'non-pay' (free-to-air) and which would be 'pay'. The viewer will now be able to select the pay channels he wishes to watch and pay for only these.