Data control system
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United States of America Patent
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-
May 8, 2001
Grant Date -
N/A
app pub date -
Jul 31, 1998
filing date -
Sep 12, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An object of the Invention is to provide a system and method for effecting a secure data control using an electronic watermarking with a low manufacturing cost. A solution of the objective is a data control system is built which comprises; embedding a control flag indicating to control data using an electronic watermarking technique, preparing a token having information as to how to control the data by using the content of the data, distributing the token appended to the data, detecting the control flag from the distributed data, reading the token appended to the data when the control flag is detected, and controlling the data according to a predefined control rule of the token or the control flag. In addition, a subsequent data control is further suppressed by modifying the token in controlling the data.
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