Method for controlling copying of protected information transmitted over a communications link
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 26, 1989
Issued Date -
N/A
app pub date -
Sep 8, 1988
filing date -
Sep 21, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A subscription television system for distributing program material protected by copyright to subscribers comprises a transmitter including a data insertion circuit for inserting a control bit in a transmitted signal comprising other control data and the protected program material. A receiver of the system includes a memory for storing a pre-assigned subscriber identification. Upon receipt and identification of the control bit at the receiver, the receiver inserts the subscriber identification into the program material so that any unauthorized copy made of the program material may be found to include the subscriber identification.
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