JP2007140961A - Device for preventing usage of fraudulent copied file, and its program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow an original file not to be performed from a copied recording medium even when the file is copied in the copiable recording medium. <P>SOLUTION: When the file A is installed, file generation date data to be stored in the file A is preserved in a preservation date file B in connection with the file to be installed. When the installed file A is performed, the file generation date in the installed file is compared with the preservation date in the preservation date file B. When the file generation date in the file A coincides with the preservation date in the preservation date file B, the performance of the file A is permitted. In the case of noncoincidence, the performance of the file A is stopped. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and a program for preventing an illegally copied file from being used by a computer.

  Files and the like stored in the storage device of the computer device can be easily copied to another storage device by a copy process. For example, by copying the contents of a hard disk on which a program file, data file, etc. recorded on a CD-ROM is installed to another hard disk, using the destination hard disk, Files can be used.

  Under these circumstances, it is difficult to prevent duplication of properly installed files. However, even if the copying cannot be prevented, for example, if the copied file cannot be executed, the contents of the normally installed file can be substantially protected.

  An object of the present invention is to prevent execution of a file from a copied recording medium even if the normally installed file is copied to a copyable recording medium.

  In addition, when an information recording medium (IC card, magnetic card, etc.) is illegally copied, the present invention also makes the user aware that the information has been illegally copied or prevents the illegally copied information recording medium from being used. For the purpose.

  The device for preventing unauthorized use of a file according to the present invention saves data representing the same date and time as the file creation date and time stored in the installation file in the storage device in association with the installation file when the file is installed. Date and time data storage means for comparison, comparison means for comparing the file creation date and time data stored in the installation file with the date and time data stored by the date and time data storage means when executing the installation file, and If the comparison means determines that the file creation date / time data matches the date / time data, execution of the installation file is permitted. If it does not match, execution of the installation file is executed. Stop Those having a file control unit. File installation is performed in such a manner that the file is stored in the storage device according to the installation program, the mode in which the file is stored in the storage device by the operating system (OS), and the file downloaded through the network is stored in the storage device. Any of the embodiments are included.

  The illegally copied file use prevention program according to the present invention associates data representing the same date and time with the file creation date and time stored in the installation file in the storage device when the file is installed. Saving date / time data saving process, processing for comparing the file creation date / time data stored in the installation file with the date / time data saved by the date / time data saving process when executing the installation file, and the above If the file creation date / time data and the date / time data match, it is permitted to execute the installation file. If it does not match, the installation file execution is executed. Stop File control process for the those to be executed by a computer.

  For example, a file (installation file) that is normally installed from a CD-ROM to a hard disk stores (adds) data representing the file creation date and time based on the timer of the computer device. An operating system (OS) that supervises the overall operation of the computer apparatus performs processing for storing creation date data of the file in an installation file.

  According to the present invention, the same date and time data as the file creation date and time data (also referred to as first date and time data) stored in the installation file by the operating system (OS) is created (obtained from the installation file). , The created (acquired) date and time data is saved in the storage device of the installation destination together with the installation file (hereinafter referred to as saved date and time data (may be referred to as second date and time data)). Date / time includes year / month / day and hour / minute / second.

  The save date / time data is saved in the storage device in association with the installation file. For this reason, when the installation file is duplicated, for example, on another recording medium, the storage date data is also duplicated on the duplication destination recording medium together with the duplicated installation file. The copied installation file stores (updates) the date and time of duplication as the file creation date and time by the operating system. On the other hand, since the storage date / time data is not date / time data created by the operating system, the date / time update processing by the operating system is not performed even if copying is performed.

  When the installation file is executed, the file creation date / time data (first date / time data) stored in the installation file is compared with the saved date / time data (second date / time data). “When the installation file is executed” means either the timing before (immediately before) execution of the installation file or the timing of execution of the installation file (in the middle of startup processing, immediately after startup processing, etc.) Including.

  If the file creation date and time data and the save date and time data match, execution of the installation file is permitted, and if they do not match, execution of the installation file is stopped (prohibited). The permission for execution of an installation file includes permission to start a program, permission to use data (such as permission to read data into a program suitable for data), permission to continue execution of a program, and permission to continue to use data. Stopping execution of an installation file includes prohibition of program start processing, prohibition of use of data (prohibition of data reading processing to a program suitable for data), and execution stop processing during program execution.

  As described above, according to the present invention, when a file that has been (legally) installed is copied to another recording medium, the creation date and time of the installation file is updated by the operating system to the date and time of copying. Is used to determine whether the installation file is a duplicate. By stopping execution of the installation file when it is determined that it has been copied, it is possible to prevent the use (illegal use) of the illegally copied installation file.

  In one embodiment, the date / time data storage means converts the date / time data into a hash value and stores the hash value obtained by the conversion in the storage device, and the comparison means stores the installation file. Further, a process of converting the file creation date and time stored in the file into a hash value is performed. Whether the installation file was properly installed or illegally copied by comparing hash values (hash value representing file creation date / time data and hash value representing date / time data) To be judged.

  The information protection system according to the present invention includes a use date recording means for recording the use date and time of the information recording medium on the information recording medium, and the same date and time as the use date and time recorded on the information recording medium by the use date recording means. An information recording medium attached device to which a recording medium is attached, or a use date storage means for saving in an information recording medium attached device connected to the information recording medium attached device through a communication line, and the information recording medium in the information recording medium attached device Comparison means for comparing the use date and time recorded on the information recording medium with the save date and time saved by the use date and time saving means when the device is mounted, and the use date and the save date and time by the comparison means. If it is determined that the information recording medium matches, the use of the information recording medium is permitted. If the information recording medium does not match, the use of the information recording medium is restricted. The usage control means for updating the usage date and time recorded on the information recording medium when the usage control means permits the use of the information recording medium, The use date and time storage means updates the stored date and time when the use control means permits use of the information recording medium.

  The information recording medium includes an IC card, a magnetic card, and other media capable of recording data, and is preferably a portable recording medium. The information recording medium is used by being mounted on an apparatus (information recording medium mounted apparatus) for reading (or reading / writing) information recorded on the information recording medium.

  The information recording medium records the use date and time of the information recording medium. The use date and time may be the date and time when the information recording medium is mounted on the information recording medium mounting apparatus, or the date and time after a predetermined operation is performed, or after the authentication process or the like is performed. It may be the date and time. The use date and time recording means for recording the use date and time of the information recording medium on the information recording medium is generally included in an information recording medium mounting apparatus on which the information recording medium is mounted.

  The same date and time as the use date and time recorded on the information recording medium is saved in the information recording medium attached device or a device (storage device or the like) connected to the information recording medium attached device through a communication line (saving date and time).

  When the information recording medium is loaded in the information recording medium loaded device, the use date and time recorded on the information recording medium and the save date and time stored in the use date and time storage means are compared. If it is determined that the use date / time matches the storage date / time, use of the information recording medium is permitted, and if it is determined that the use date / time does not match, use of the information recording medium is restricted.

  The mode in which use of the information recording medium is permitted includes a mode in which use of the information recording medium mounted device or use of a device connected to the information recording medium mounted device through a communication line is permitted. For example, the information recording medium mounting apparatus is an apparatus for inputting image data (may also have processing such as correction, correction, browsing, printing, etc. of image data). Assume that a device connected by a communication line is an image storage device. In this case, if the use date and time recorded in the information recording medium is the same as the save date and time saved in the use date and time storage means, input of image data to the image input device is permitted, and the inputted image Storage of data in an image storage device is permitted. Assume that the information recording medium mounting device is a cash dispenser. In this case, if the use date / time and the storage date / time are the same, use of the cash dispenser (cash withdrawal, etc.) is permitted (of course, input of a correct password may be a further condition for use permission).

  Further, the usage date and time recording means updates the usage date and time recorded on the information recording medium when the usage control means permits the use of the information recording medium, and the usage date and time storage means stores the usage date and time. When the use of the information recording medium is permitted by the control means, the stored date and time are updated. That is, each time the information recording medium is loaded into the information recording medium mounting device and the use of the information recording medium is permitted (the use date and the save date coincide with each other), the use date and the save date and time are a new date and time. Will be updated.

  On the other hand, when the use date and time recorded in the information recording medium and the save date and time stored in the use date and time storage means are not the same (if they do not match), the use of the information recording medium (as described above, the information recording Use of a medium-attached device or use of a device connected to the information recording medium-attached device via a communication line) is limited. For example, input or storage of image data is refused, or withdrawal of cash is refused.

  Preferably, when the use date and time recorded in the information recording medium and the save date and time saved in the use date and time saving means are not the same (if they do not match), the notifying means for notifying the fact is the information recording medium mounting device Prepared for.

  According to the present invention, when the recorded contents of the information recording medium are illegally copied, the authorized holder of the information recording medium has illegally copied the recorded contents of the information recording medium (impersonation has been performed). Can know. When an illegally copied information recording medium is used, the date and time when the illegally copied information recording medium is used is saved as the saving date and time in the usage date and time storage means, and then the authorized user receives the legitimate information. This is because when using the recording medium, the use date and time of the legitimate information recording medium and the save date and time stored in the use date and time storage means do not match.

  Further, if an authorized user uses a legitimate information recording medium before the illegally copied information recording medium is used, the illegally copied information recording medium cannot be used. This is because the use date and the storage date and time in the illegally copied information recording medium are not matched when the legitimate user uses the legitimate information recording medium again.

  As described above, according to the present invention, even if the recorded content of the information recording medium is illegally copied, the user of the legitimate information recording medium thereafter notices that the recorded content of the information recording medium has been illegally copied. It is possible to prevent the use of the information recording medium copied illegally.

  Random numbers may be recorded (stored) in the information recording medium and storage means (random number storage means) instead of the date and time (use date and storage date and time). An information protection system using a random number includes a random number generating means for generating a random number, a random number recording means for recording the generated random number on an information recording medium, and the same random number as the random number recorded on the information recording medium. Is mounted on an information recording medium mounted device, or random number storage means for storing in an apparatus connected to the information recording medium mounted device through a communication line, and the information recording medium is mounted on the information recording medium mounted device. A comparison means for comparing the recorded random number recorded on the information recording medium with the stored random number stored by the random number storage means, and the comparison means determines whether the recorded random number matches the stored random number. If it is determined that the information recording medium does not match, the use control means for restricting the use of the information recording medium and the When the use of the information recording medium is permitted by the control means, the recorded random number recorded on the information recording medium and the stored random number stored in the random number storing means are updated to a new random number. Control means for controlling the random number generation means, the random number recording means, and the random number storage means is provided.

  FIG. 1 is a block diagram illustrating an example of a hardware configuration of a computer system (hereinafter referred to as an unauthorized copy usage prevention system) that prevents the use of files by unauthorized copying.

  The unauthorized copy use prevention system is realized by a computer device (such as a personal computer). The unauthorized copy use prevention system includes a CPU 1. The CPU 1 is connected with an input device 2, a display device 3, a memory 4, a timer 5, a hard disk 6, and the like. A portable recording medium 7 such as a USB memory, DVD-ROM, or MO can also be connected to the unauthorized copy use prevention system.

  In this embodiment, it is assumed that programs (a date and time storage program and a date and time confirmation program) for causing a computer device to function as an unauthorized copy use prevention system are stored in the hard disk 6. Details of the processing of these programs will be described later.

  FIG. 2 shows a state of file storage in the portable recording medium 7 at the time of file installation (left side) and a state of file storage in the portable recording medium 7 at the time of file copy (right side). FIG. 3 is a flowchart showing the flow of the file saving process including the process of the date / time saving program. FIG. 4 is a flowchart showing the flow of processing of the date confirmation program.

  The date / time storage program is executed when a user of the unauthorized copy use prevention system newly installs a file.

  When a file A (file to be saved) is newly installed on the portable recording medium 7 from, for example, a CD-ROM, the user selects the portable recording medium 7 as an installation destination. The operating system (OS) adds (stores) data representing the creation date (update date) to the file A to be installed (hereinafter referred to as file A), and the portable recording medium is selected as the installation destination. The file A is recorded (saved) in 7 (step 31). Data (2005/06/08/10: 44 in FIG. 2) (year / month / day and hour / minute / second) representing the creation date / time (update date / time) is based on the date / time counted by the timer 5.

  In addition to the normal processing by the OS described above, processing by a date / time storage program is executed. The date and time saving program acquires data representing the creation date and time (update date and time) included in the file A saved in the portable recording medium 7 by the OS, and stores the data representing the obtained creation date and time (update date and time) as the save date and time (update date and time). (Substance data) is stored in the portable recording medium 7 (step 32). As a result, the storage date and time file B is stored together with the file A in the portable recording medium 7 (see the left side of FIG. 2). The file A and the storage date / time file B created and stored by the date / time storage program are stored in association with each other. For example, the same identification code for specifying the association is added to the file A and the storage date / time file B. The contents of the storage date / time file B (storage date / time data) may be included in a part of the file A. The date and time storage program may be incorporated in a part of the OS (or an installation program for installing a program or the like).

  Consider a case where a copy operation of the file A recorded on the portable recording medium 7 is performed. When the file A recorded on the portable recording medium 7 is copied to another recording medium, the save date / time file B associated with the file A is also saved on the copy destination recording medium together with the file A (see FIG. (See right side of 2). In the file A (and the save date / time file B), date / time data (date / time counted by the timer 5) when the copy operation is performed by the OS is newly stored as creation date / time data (in FIG. 2). , 2005/07/08/21: 55).

  When the file A stored in the portable recording medium 7 is executed (when the file A is used), a date / time confirmation program (FIG. 4) is executed.

  When an instruction for execution processing is performed for file A (for example, when an icon representing file A is double-clicked), the creation date and time included in file A and the storage associated with file A are stored. The storage date / time (substance data) of the date / time file B is compared (step 41).

  If the creation date / time in file A matches the save date / time in file B (YES in step 41) (see the left side of FIG. 2), the date / time confirmation program permits execution processing for file A (Step 42). If the file A is a program file, the program is started. If the file A is a data file, a program suitable for the data is started, and data reading processing is performed.

  If the creation date and time in file A and the save date and time (substance data) in file B do not match (NO in step 41) (see the right side of FIG. 2), the date and time confirmation program executes file A. Do not allow processing. That is, the file A cannot be used.

  When the file A to which the execution instruction is given is created by a copy operation, the creation date / time in the file A does not match the save date / time in the file B associated with the file A (see FIG. 2 right side). In such a case, the use of the file A is restricted by the date and time confirmation program. The use of the illegally copied file A is prevented.

  The date and time confirmation program may be incorporated into a part of the OS.

  The save date and time in the save date and time file B described above may be stored in the save date and time file B after being converted into a hash value by a hash function. In this case, the date / time confirmation program converts the storage date / time of the installation file A into a hash value and then compares it with the hash value in the storage date / time file B. Rewriting of date / time data can be prevented.

  FIG. 5 is a block diagram showing the overall configuration of a photo storage system having an unauthorized access prevention function.

  The photo storage system includes a photo storage server 11 and a plurality of reception machines 12 connected to the network 10. Each of the photo storage server 11 and the accepting machine 12 is a computer device including a CPU, a memory, a communication device, an input device, a storage device, and the like.

  The photo storage server 11 (hereinafter referred to as the server 11) is a device that provides a service for storing (viewing or printing) image data obtained by a user photographing a subject using a digital camera or the like. The user inputs an ID (an identification code assigned in advance for each user) and image data to the accepting machine 12 (transfers image data recorded on a memory card attached to the digital camera to the accepting machine 12). To do). The input image data is transmitted to the photo storage server 11 via the network 1. The server 11 stores (or prints) the received image data for a predetermined period.

  User cards (IC cards or magnetic cards) 13a, 13b, 13c,... Owned by each user are inserted into the accepting machine 12. In the user cards 13a, 13b, 13c,..., The above-mentioned ID, other personal identification information, and a time stamp to be described later are stored. The user (assuming the owner of the user card 13a) inserts the user card 13a into the card insertion slot of the accepting machine 12, and inputs the ID, password, etc. as necessary, so that the server 11 and the accepting machine 12 You can receive services such as photo storage service, image browsing service, and print service.

  As described above, IDs (ID1, ID2, ID3,...) And other information for identity verification are previously stored in the user cards 13a, 13b, 13c. It shall be remembered (when distributed). An ID for identifying the user and a time stamp to be described later are also stored in the database 14 connected to the server 11.

  FIG. 6 is a flowchart showing the processing flow of the unauthorized access prevention function in the above-described photo storage system.

  A user card 13a is attached to the accepting machine 12, and an ID, a password, etc. are input to the accepting machine 12 as necessary.

  When it is detected in the accepting machine 12 that the user card 13a is attached (YES in step 61), the accepting machine 12 reads the ID (ID1) from the user card 13a and transmits it to the server 11 (step 62). .

  If a user card 13a has been attached to the accepting machine 12 in the past, a time stamp (date and time data) is stored (saved) in the user card 13 and the database 14 connected to the server 11. Yes. When the user card 13a is first inserted in the accepting machine 12, the processing using the time stamp described below is not performed in the accepting machine 12 and the server 11, but the accepting machine 12 and the server 11 are used. A photo storage service was provided to users.

  Hereinafter, a case where the user card 13a has been attached to the receiving machine 12 in the past will be described.

  If the user card 13a has been attached to the accepting machine 12 in the past, the user card 13a and the database 14 connected to the server 11 will have a time stamp (year / month / day and hour / minute / second associated with the ID). ) Is stored. When the server 11 receives the ID transmitted from the accepting machine 12, the server 11 reads the time stamp associated with the received ID from the database 14 and transmits it to the accepting machine 12 (the accepting machine 12 that transmitted the ID) (step 71). ).

  The receiving machine 12 that has received the time stamp from the server 11 reads the time stamp from the user card 13a attached to the receiving machine 12 (steps 63 and 64). The time stamp recorded in the user card 13a is read (hereinafter referred to as “read time stamp”) and the time stamp transmitted from the server 11 and received (hereinafter referred to as “reception time stamp”) is compared ( Step 65).

  Normally, the read time stamp in the user card 13a matches the reception time stamp in the database 14 (YES in step 65). In this case, use of the service by the user (photo storage service or the like) is permitted, and input of a user request (image data input, photo storage request, print request, or the like) is accepted. The accepting machine 12 transmits a service use permission notice to the server 11 (step 66).

  If the read time stamp in the user card 13a does not match the received time stamp in the database 14 (NO in step 65), the user is warned (details will be described later) ( Step 69).

  The server 11 that has received the service use permission notification may be a new time stamp (a time stamp based on a timer provided in the server 11 or an NTP (Network Time Protocol) server connected to the server 11 via the network 10. (The date and time acquired from (not shown) may be used as a time stamp) is stored in the database 14 (overwritten and updated), and the time stamp is transmitted to the accepting machine 12 (step 72). The server 11 performs processing (image data storage processing or the like) according to the request from the user (service provision processing; step 73).

  The new time stamp transmitted from the server 11 is also saved (overwritten and updated) in the user card 13a in the accepting machine 12 (step 67). Thus, in a normal usage mode, the time stamp in the user card 13a always matches the time stamp in the database 14 of the server 11.

  Consider the case where the contents of the user card 13a (time stamp, ID, etc. described above) are copied by a third party (hereinafter, the authorized user card is referred to as the “original user card 13A”) The user card is referred to as “copy user card 13B.” The user of the original user card 13A is referred to as “regular user”, and the user of the copy user card 13B is referred to as “malicious person”).

  Since the contents of the original user card 13A are copied to the copy user card 13B, the time stamp in the copy user card 13B matches the time stamp in the database 14. It is assumed that the Service-to-Self attaches the copy user card 13B to the accepting machine 12 before the authorized user inserts the original user card 13A into the accepting machine 12 again. A Service-to-Self can use the copy user card 13B to impersonate a regular user and receive a service (hereinafter, this mode is collectively referred to as “illegal access”).

  However, when the authorized user inserts the original user card 13A into the accepting machine 12 after unauthorized access by the Service-to-Self, the authorized user can know that unauthorized access has been performed. The time stamp update process described above (time stamp overwrite process in both the copy user card 13B and the database 14) is also performed during unauthorized access by the Service-to-Self (steps 67 and 72). This is because the time stamp in the original user card 13A owned by the user does not match the time stamp in the database 14, and warning processing is performed (NO in step 65, step 69). In the warning process (step 69), the accepting machine 12 notifies the user that unauthorized access has been made (displays a warning text on the display screen, sounds an alarm sound, etc.). The authorized user can know that unauthorized access has been made (the contents of the original user card 13A have been copied).

  Of course, when an unauthorized user notices that unauthorized access has been made, the authorized user will take measures such as changing the ID or making the original user card 13A new.

  Unlike the above, if a legitimate user attaches the original user card 13A again to the accepting machine 12 before the unauthorized person gains unauthorized access, unauthorized access by the malicious person can be reliably prevented. This is because the original user card 13A and the time stamp in the database 14 are updated when the original user card 13A is attached to the receiving machine 12 again. In this case, when the Service-to-Self attaches the copy user card 13B to the receiving machine 12, the time stamp in the copy user card 13B and the time stamp in the database 14 do not match (NO in step 65). The service provided by the user of the machine 12 and the server 11 cannot be received.

  In the second embodiment described above, time stamps are recorded (stored) in the user card 13 and the database 14 connected to the server 11, and the two time stamps are compared (step 65). The server 11 generates random numbers (including numerical values, characters, etc.), and records (saves) the generated random numbers in the user card 13 and the database 14 connected to the server 11 for comparison processing. Also good.

It is a block diagram which shows the electric constitution of an unauthorized copy use prevention system. (A) shows the state of file storage on a portable recording medium when creating a file, and (B) shows the state of file storage on a portable recording medium when copying a file. It is a flowchart which shows the flow of the file preservation | save process including a process of a date preservation | save program. It is a flowchart which shows the flow of a process of a date confirmation program. It is a block diagram which shows the whole structure of the photograph preservation | save system provided with the unauthorized access prevention function. It is a flowchart which shows the flow of a process of an unauthorized access prevention function.

Explanation of symbols

1 CPU
2 Input device 3 Display device 4 Memory 5 Timer 6 Hard disk 7 Portable recording medium 11 Server 12 Acceptance machine 13a, 13b, 13c User card 14 Database

Claims (5)

A date and time data storage means for storing data representing the same date and time as the file creation date and time data stored in the installation file in association with the installation file when the file is installed;
When executing the installation file, the file creation date and time data stored in the installation file is compared with the date and time data saved by the date and time data saving means, and the file creation is performed by the comparison means. A file control means for permitting execution of the installation file when it is determined that the date and time data match the date and time data; and for stopping the execution of the installation file when it is determined that they do not match;
Use prevention device for illegally copied files with. The date and time data storage means is
The date / time data is converted into a hash value, and the hash value obtained by the conversion is stored in the storage device.
The comparison means is
The file creation date and time data stored in the installation file is further converted into a hash value.
The use prevention apparatus of the illegally copied file according to claim 1. Date and time data storage processing for storing data representing the same date and time as the file creation date and time data stored in the installation file in the storage device in association with the installation file when the file is installed,
When executing the installation file, the file creation date / time data stored in the installation file is compared with the date / time data saved by the date / time data saving process, and the file creation is performed by the comparison process. A file control process that permits execution of the installation file if the date / time data matches the date / time data, and stops execution of the installation file if the date / time data does not match;
A program that prevents unauthorized use of files that are executed by a computer. Usage date and time recording means for recording the usage date and time of the information recording medium on the information recording medium;
The same date and time as the use date and time recorded on the information recording medium by the use date and time recording means is connected to the information recording medium attached device to which the information recording medium is attached or to the information recording medium attached device through a communication line. Use date and time storage means to store in the selected device,
Comparing means for comparing the use date and time recorded on the information recording medium with the save date and time saved by the use date and time saving means when the information recording medium is loaded on the information recording medium loading device. When the coincidence between the use date and the storage date is determined by the comparing means, the use of the information recording medium is permitted, and when the coincidence is not determined, the use of the information recording medium is restricted. Use control means,
The usage date and time recording means updates the usage date and time recorded on the information recording medium when the usage control means permits the use of the information recording medium.
The use date and time storage means updates the stored date and time when the use control means permits the use of the information recording medium.
Information protection system. Random number generation means for generating a random number;
Random number recording means for recording the generated random number on an information recording medium;
Random number storage for storing the same random number as the random number recorded on the information recording medium in an information recording medium attached device to which the information recording medium is attached or a device connected to the information recording medium attached device through a communication line means,
Comparing means for comparing the recorded random number recorded on the information recording medium with the stored random number stored by the random number storing means when the information recording medium is mounted on the information recording medium mounting apparatus. ,
Usage control that permits the use of the information recording medium when the comparison means determines that the recorded random number matches the stored random number, and restricts the use of the information recording medium when it is determined that they do not match. When the use of the information recording medium is permitted by the means and the use control means, the recorded random number recorded on the information recording medium and the stored random number stored in the random number storing means are changed to a new random number. Control means for controlling the random number generation means, the random number recording means and the random number storage means to be updated;
Information protection system with

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