System and method for transmitting entertainment information to authorized ones of plural receivers
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United States of America Patent
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Feb 25, 1992
Grant Date -
N/A
app pub date -
Aug 6, 1990
filing date -
Aug 6, 1990
priority date (Note) -
Expired
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Abstract
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which is transmitted along with the aperiodically inverted video information.
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