Importance

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Abstract

In a method and a remote controller for preventing unauthorized duplication of the remote controller by a copying apparatus, a copy-preventing signal is inserted at a control signal which is generated and transmitted by the remote controller and which is to be received by a corresponding receiver unit for remote control operation of an appliance that is connected to the receiver unit. The copy-preventing signal is inserted at one of the low logic bits of the control signal immediately following a high logic bit of the latter. The combination of the high logic bit and the copy-preventing signal has a duration within a noise threshold of the receiver unit such that the receiver unit can correctly identify the combination of the high logic bit and the copy-preventing signal as a single high logic bit while the copying apparatus misinterprets the combination of the high logic bit and the copy-preventing signal as two high logic bits.

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First Claim