Cryptography – Cryptanalysis
Patent
1996-06-28
1997-08-26
Swann, Tod R.
Cryptography
Cryptanalysis
3642866, H04L 932
Patent
active
056618000
ABSTRACT:
In case that software is written on a recording medium at physical addresses thereof in units of a prescribed size and the software is subsequently executed upon being read out of the recording medium from the physical addresses in the order of logical addresses, the corresponding relationship between the logical addresses of the software and the physical addresses conforming to the logical addresses, as well as a checking program for preventing unlawful use of the software, is added on to the main body of the software, which is then recorded on an original. Before execution of the software that has been recorded on a recording medium (the original or a copy), the corresponding relationship between the logical and physical addresses on this recording medium is obtained by the checking program. The corresponding relationship obtained and the corresponding relationship that has been added to the software are compared. If the two agree, it is deemed that the recording medium is the original and execution of the main body of the software is allowed. If the two do not agree, execution of the main body of software is not allowed.
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Naito Kazunori
Nakashima Kazuo
Fujitsu Limited
Saunders Keith W.
Swann Tod R.
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