Scrambling and unscrambling method for composite video signals and implementing device
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United States of America Patent
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May 4, 1993
Issued Date -
N/A
app pub date -
Dec 23, 1991
filing date -
Dec 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The method of the invention consists, during the transmission of composite video signals, in the inclusion therein of series of access messages (ECM1, ECM2) and, during the unscrambling, carried out using a chip card reader whose chip card comprises encoded digital data, in using an interactive method of identification of a digital signature.
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