JPH03278230A - Method for inspecting restriction of program execution - Google Patents

Abstract

PURPOSE:To previously prevent a program whose available period has lapsed form being used without permission by forming an access key based upon the inherent number of a computer and the available period of the program. CONSTITUTION:A program inspection area 12 is arranged on the head of a read out program and the program area 13 of a main body is arranged succeeding the are 12. In this constitution, an access key to be a code for determining the propriety of program execution is formed based upon the inherent number of the computer and the available period of the program. At the time of executing the program body, the propriety of program execution is inspected based upon the access key, the inherent number of the computer, and a current data and the execution of only the program included within the available period is permitted. Since the execution of the program whose available period has lapsed is automatically interrupted, the program can be prevented from being used without permission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a program execution restriction checking method for checking whether a program running on a computer system is permitted to be executed on the computer system.

[Conventional technology]

In recent years, small computer systems such as workstations and personal computers are rapidly becoming popular in offices and the like, replacing conventional large computer systems.

With the spread of such computer systems, there is an increasing need to protect programs and data from disasters and crimes.

Therefore, if it is necessary to keep a program or data secret, a password is set as a code that determines whether or not it can be executed, and only users who are allowed to execute it by verifying the password can use the computer system. .

[Problem to be solved by the invention]

Incidentally, among the programs executed on a computer system, there are programs owned by users as well as programs borrowed from outside. Such programs have a limited period of use, and as a general rule, they must be returned to the lending party after the period has expired. However, conventional program execution restriction checks only check whether the user who entered the password has the right to use the program. It was possible to run the program just by passing the test. Therefore, when the expiration date management of a program is left to the user, there is a problem that the program may be used accidentally or intentionally without permission even though the expiration date has passed.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a program execution restriction checking method that can prevent unauthorized use of a program whose expiration date has passed.

[Means for Solving the Problems] and [Operation] The program execution restriction checking method according to the present invention uses an access key, which is a code for determining whether or not a program can be executed, based on a computer-specific number and a program expiration date. When executing the program, it is verified whether or not the program can be executed based on the access key, the computer-specific number, and the current date, and only programs within the expiration date are permitted to be executed. Therefore, since execution of a program whose expiration date has passed is automatically stopped, unauthorized use of the program can be prevented.

〔Example〕

An embodiment of the program execution restriction checking method according to the present invention will be described below.

FIG. 1 is a block diagram showing the basic configuration of a computer system for implementing the program execution restriction checking method according to the present invention.

In the figure, 1 is a display, which is composed of a display device such as a CRT. A display control unit 2 controls the display 1 and displays windows, data, etc. according to various functions. A keyboard 3 is used to input commands, characters, and the like. A mouse 4 is used as a pointing device, and a cursor is used to select a display area displayed on the display. Reference numeral 5 denotes a keyboard/mouse control unit, which performs input/output control of commands inputted from the keyboard 3 and mouse 4, pigs, etc.

A disk 6 stores control programs for executing various functions. 7 is a disk control unit, which controls data input/output on the disk 6;

A main memory 8 stores operating programs that manage the basic operations of the system, commands and input input from the keyboard 3 and mouse 4, and programs and data read from the disk 6. .

Reference numeral 9 denotes a CPU (central processing unit), which controls the entire system and executes various arithmetic processes according to a program connected to instructions inputted from the keyboard/mouse control section 5. After the programs and data stored on the disk 6 are read into the main memory 8, they are
It is re-accessed by the PU 9 and the functions of each control means described above are implemented. Further, 10 is a system number.

FIG. 2 is an explanatory diagram showing a part of the main memory 8 shown in FIG. 1, and shows the software configuration provided by the program execution restriction checking method according to the present invention. A program inspection area 12 is placed at the beginning of the program read into the memory area 11, followed by a main body program area 13.

Next, the processing procedure for generating an access key that is a code for determining whether or not a program can be executed will be explained based on the flowchart shown in FIG.

First, the computer-specific number is set to HID, and the expiration date of the program is set to EXDATE (step 101). Next, multiply ()I I D) by the function F1 to obtain AK [11
Then, multiply (EXDATE) by the function F2 to get AK[2
] (Step 102).

Then, we calculated (AK [1 piece, AK [2])
is further multiplied by the function F3 to obtain the access key (
Step 103).

Next, the processing procedure at the time of access key verification in the program inspection area 12 shown in FIG. 2 will be explained based on the flowchart of FIG. 4.

First, the functions Fil and F1 are added to the input access key.
Multiply by 2 to obtain AK [1 piece and AK [2], respectively (step 201). Next, enter the computer-specific number H
ID, and the current time (at the time of execution) is set as DATE (step 202). Then, (HID, AK[1,]) is multiplied by the function FKI to obtain verification 1 (step 203), and it is determined whether verification 1 passes (step 204). If verification 1 passes here, (DATESAK [2]
) is multiplied by the function FK2 to obtain verification 2 (Step 205)
, determine whether verification 2 passes (step 206)
.

Here, if verification 2 passes, execution of the program is permitted (step 207), and execution of the program itself is continued (step 208).

If verification 1 in step 204 and verification 2 in step 206 fail, execution of the program is not permitted (step 208), and execution of the program itself is stopped (step 209).

〔Effect of the invention〕

As explained above, in the program execution restriction inspection method according to the present invention, an access key is generated from a computer-specific number and the expiration date of the program, and based on this access key, it is verified whether or not the program can be executed. Even if the program is permitted to be executed on a computer, if the expiration date has passed, the execution of the program will be stopped, thereby preventing the user from using the program without permission.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the basic configuration of a computer system for implementing the program execution restriction checking method according to the present invention, Fig. 2 is an explanatory diagram showing a part of the memory area of the main memory, and Fig. 3 is an access key. FIG. 4 is a flowchart showing the processing procedure when generating an access key in the program inspection area. 1...Display, 3...Keyboard, 4...
Mouse, 6... Disk, 9... CPU (Central Processing Unit), 11... Memory area, 12... Program inspection area, 13... Program area. Unexamined Japanese Patent Publication No. 3 278230 (4)

Claims (1)

[Claims] In a program execution restriction checking method for checking a code that determines whether or not a program can be executed when the program is executed, an access key is generated based on a computer-specific number and a program expiration date, and an access key is generated when the program is executed. A method for inspecting program execution restrictions, characterized in that it verifies whether or not a program can be executed based on the access key, a computer-specific number, and the current date, and permits execution only for programs within an expiration date.