Subscription television system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 6, 1985
Grant Date -
N/A
app pub date -
Sep 8, 1982
filing date -
Sep 10, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a subscription television system, only a video signal for a specific program is scrambled in a television signal in accordance with a predetermined scrambling mode. A key signal, used for unscrambling the scrambled video signal, is generated in response to the scrambling mode. The key signal is transmitted after the scrambled program.
First Claim
Family
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- [Patents Count]
Cited Art Landscape
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