초록 ▼

An information signal (INF) which is transmitted in coded form (CINF) from a signal source (RC) to a signal receiver (4, 5) is decoded at the receiver and at the same time marked (MINF) by the introduction of an identification information (ID) which is characteristic of the receiver or its possessor

An information signal (INF) which is transmitted in coded form (CINF) from a signal source (RC) to a signal receiver (4, 5) is decoded at the receiver and at the same time marked (MINF) by the introduction of an identification information (ID) which is characteristic of the receiver or its possessor. The signal from a video disc (RC) carrying a coded programme is decoded and marked before it is supplied to a television set (6). Via said identification information of so-called pirate copy is directly traceable to its originator. Thereby a protection against such copying is obtained. A device for the playback of a video disc of this type comprises a decoding and modification unit to which the necessary decoding information and identification information may be supplied from a personal data carrier (ID).

대표청구항 ▼

A method for processing a coded information signal, which coded information signal is transmitted from a signal source to a signal receiver, in order to mark the information content of the information signal and thereby to permit tracing of unauthorized copying of said information signal, the method

A method for processing a coded information signal, which coded information signal is transmitted from a signal source to a signal receiver, in order to mark the information content of the information signal and thereby to permit tracing of unauthorized copying of said information signal, the method comprising: decoding the information signal at a signal receiver during reception; obtaining an indentification information and unique modification information from a data carrier, said identification information comprising personal identification information in the form of a personal code comprising a bit sequence of a given number of bits; modifying the decoded information signal receiver by introducing into the decoded information signal said identification information; said identification information being a characteristic of at least one of said signal receiver and its possessor; and said identification information being introduced into at least one of time and frequency spaces of the decoded information signal such that the information content of said information signal is essentially unchanged.