Method for automatically activating a control procedure at a user's game system through a broadcast network when said user's license is expired
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United States of America Patent
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Jul 7, 1998
Grant Date -
N/A
app pub date -
Dec 27, 1995
filing date -
Dec 27, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention discloses a computer software protection method which is especially applicable to video game titles broadcast via cable TV and satellites. The invention can detect invalid licenses and then automatically activate control procedures at the user site. The invention utilizes the natural properties of oscillators which has a normal distribution of frequencies. Consequently, if two timing instruments using different kinds of oscillators have been synchronized first, comparing their time deviation can tell how much time has past since their synchronization date. Accordingly, we can detect if a user's license is expired by comparing the time deviation between both sites. If the deviation exceeds a predetermined value which means the user's license is expired, then various control procedures will be automatically activated at the user site.
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