Method and device for temporarily authorizing the use of a progr

Details Method and device for temporarily authorizing the use of a progr Method and device for temporarily authorizing the use of a progr

1996-06-27

1999-04-27

Tarcza, Thomas H.

Cryptography

Cryptanalysis

3408253, 34082531, 36447904, 36447907, H04L 900, G06F 704, G06F 1700, G06G 748

Patent

active

058987789

ABSTRACT:
A method and device for authorizing execution of rented computer programs utilize a monostable element to determine usage time and a password to authorize use of the program for additional rental periods. The method and device involve a cartridge which is connected to the computer that executes the computer program. The cartridge is scanned in response to usage of the computer program (for example, the user typing on the computer keyboard). The scanning triggers a monostable element which remains in an active state for a predetermined amount of time, and time units are only counted while the monostable element is active. This permits a more accurate measurement of time during which the user is actually using the computer program. In order to authorize additional rental periods, a password scheme is utilized. The password scheme allows the cartridge and therefore the rental period to be reset from the computer, without the user having to physically obtain a new cartridge from the renter of the program or engage in some other type of physical exchange.

REFERENCES:
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patent: 5155768 (1992-10-01), Matsuhara
patent: 5212729 (1993-05-01), Schafer
patent: 5392351 (1995-02-01), Hasebe et al.
patent: 5533125 (1996-07-01), Bensimon et al.
patent: 5564038 (1996-10-01), Grantz
patent: 5586301 (1996-12-01), Fisherman et al.
patent: 5715169 (1998-02-01), Noguchi

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