Amusement devices: games – Including means for processing electronic data – Access or authorization
Patent
1995-12-27
1998-07-07
Harrison, Jessica
Amusement devices: games
Including means for processing electronic data
Access or authorization
395186, 395712, 380 25, 380 4, G06F 1516
Patent
active
057759944
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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Harrison Jessica
Sager Mark A.
United Microelectronics Corp.
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