JPS61243523A - File management system - Google Patents

Abstract

PURPOSE:To prevent a lent program from being used after the expiration of lending by comparing information of the number of days till the expiration of the validity time recorded on an external file with the number of days of the use obtained from date information in a computer. CONSTITUTION:Data 7 of the number of days of validity is written on a file of a floppy disc 6 to which the term of validity should be given. Use start data 8 is read before this file is used, and the date obtained from a date information device 4 of a computer at this time is written as data 8 if nothing is written as data 8. If data 8 is set,the number of days of the use is calculated in accordance with its date and date information obtained from the device 4. This number of days of the use is compared with data 7 by a comparator 2, and this file is handled as a file which is within the term of validity and can be used only when the number of days of the use is smaller than date 7. In this system, the file is not used after the expiration of lending even in a computer where date information is not correctly set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of setting an expiration date on an external file and managing the file.

[Conventional technology]

Traditionally, when an external file has an expiration date, it has to have an expiration date on it.

It was proposed to compare that date with the date obtained from the computer's date information device.

[Problem that the invention seeks to solve]

With the conventional date-based management described above, if you try to evaluate a program by storing it on a floppy disk, etc., if the date information device of the Combiator is not set correctly, the copied program may not be used. The drawback was that it was possible.

[Means for solving problems]

According to the present invention, an external file has information on the number of days until the expiry date, the combiator records the date information on the start of use in this external file, and the computer records the information on the start date of use and the number of days until the expiry date when the combiator starts using the external file. To obtain a file management method that allows use of an external file only when the expiration date of the external file is within the usage expiration date by calculating the expiration date from and comparing it with the current date information created in the combinator.

〔Example〕

Next, the present invention ζ will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. 1 is a computer, 2 is a comparison device, 3 is a main memory, 4
is a date information device, 5 is a floppy disk reader, 6 is a floppy disk, 7 is valid days data on the floppy disk, and 8 is start date data on the floppy disk.

Try to give it an expiration date. floppy disk 6
Write the valid days data 7 in the above file.

Before using this file, read the first use date data 8, and if nothing is written, write the date obtained from the date information device 4 of the computer 1 at that time as the first use date data 8. , If use start date data 8 is set, the number of days of use is calculated from that date and date information obtained from the date information device 4 of the computer. Then, this number of days of use is compared with the valid days data 7 on the file using the comparing device 2, and it is determined whether the file is within its valid period.

Figure 2 is an example of comparison, and it is assumed that the valid days data 9 and the number of days used, which are information on the external file, consist of information on the number of days, and the other information consists of information on January 2, 2017. . Effective days data 9 to 10 days, start of use 10 to 6
If the information March 19, 0 is written, and date information data 11 is March 25, 60,
The number of days of use is 13, which is 6 days, and the valid days data is 9.
If the date information 12 is March 30, 1960, the number of days of use is 1.
4 is 11 days, which is past the effective number of days, so it is treated as an unusable file.

〔Effect of the invention〕

According to the present invention, an external file can have an expiration date even on a computer whose date information is not set correctly. It will not be used even after the period ends.

This has the effect of making it easier to protect programs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing an example of comparison between the number of valid days and the number of days used. DESCRIPTION OF SYMBOLS 1... Computer, 2... Comparison device, 3... Main memory, 4... Date information device, 5... Floppy... Disk reader, 6... Floppy disk, 7...
...Validity days data on floppy disk, 8
......Data on the start date of use on the floppy disk, 9...Data on the number of valid days, 10...
Use start date, 11.12...Date information data,
13.14...Number of days of use. Chicken soup soaked with g

Claims (1)

[Claims] By comparing the information on the number of days until the expiration date recorded in the external file and the number of days of use obtained from the date information device in the computer, the information on the number of days until the expiration date recorded in the external file is compared. The management method is characterized in that the external file is allowed to be used on the computer only when the number of days of use is small.