Device for calculating a charge for a charged information signal

Cryptography – Key management – Having particular key generator

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380 16, 380 25, 380 44, H04L 904

Patent

active

047962976

ABSTRACT:
The amount of money which should be charged upon reception of a pay television signal or a like information signal, is calculated by a charging device comprising a calculator (25) for calculating the amount of charge and an encoder (28) for encoding the charge and time instant (date) using by a key code specific to the charging device to form a check code which should be reported together with the charge. The date data may be indicated either by a timepiece (26) or by a time signal multiplexed on the information signal. Cost information used in the calculator may be multiplexed on the information signal. Alternatively and preferably, the cost information is represented by a scrambling key used in providing the information signal.

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patent: 4528588 (1985-07-01), Lofberg
patent: 4599647 (1986-07-01), George et al.

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