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PREVENTION SYSTEM FOR ILLICIT USE OF PROGRAM 


Pub'. No.: 04-1 17548 [JP 41 17548 A ] 
Published: April 17, 1992 (19920417) 
Inventor: KUROZUMI HIROAKI 

Applicant: FUJITSU LTD [000522] (A Japanese Company or Corporation), JP (Japan) 
Application No.: 02-238301 [JP 90238301] 
Filed: September 07, 1990(19900907) 
International Class: [ 5 ] G06F-01 5/00; G06F-009/06 

JAPIO Class: 45.4 (INFORMATION PROCESSING'- Computer Applications); 45.1 
(INFORMATION PROCESSING - Arithmetic Sequence Units) 

JAPIO Keyword: R131 (INFORMATION PROCESSING - Microcomputers & Microprocessers) 
Journal: Section: P, Section No. 1400, Vol. 16, No. 373, Pg. 36, August 1 1, 1992 (1992081 1) 

ABSTRACT 

PURPOSE: To prevent the alteration of the data as well as the analysis of software by detecting the 
stop state of a program and erasing the contents of a memory when the execution of the program is 
discontinued. 

CONSTITUTION: When a transaction processing program is started, the set/reset commands are 
produced for the timers provided at a fixed interval into the program. A timer means 14 which is 
controlled by the set/reset conmiands produces the time-over output when no reset command is 
produced within a fixed time. A memory erasing means 1 5 is driven by the time-over output. Thus 
the means 15 erases the contents of a memory 13 and then erases the entire program for transaction 
processing. Then the analysis of the program contents can be prevented. 


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