JPH08286903A - Data processor, video game device, driving device for the same and security cassette - Google Patents

Abstract

PURPOSE: To satisfactorily prevent an auxiliary storage medium from being illegally copied. CONSTITUTION: A restoration circuit 21 restores program data read from a CD-ROM 2, in which program data ciphered based on a prescribed key code are stored, based on the prescribed key code. A CPU 22 performs various kinds of operation processing based on the program data restored by the restoration circuit 21. These restoration circuit 21 and CPU 22 are integrated into a one-chip IC 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device, a video game device and its driving device, and a security cassette, and more particularly, for example, a CD-RO.
The present invention relates to a security system that prevents unauthorized duplication of auxiliary storage media such as M and non-volatile memory.

[0002]

2. Description of the Related Art As a security system for preventing an auxiliary storage medium such as a CD-ROM or a non-volatile memory from being illegally copied and used, a conventional video game apparatus as an example of a data processing apparatus is used. For example, as described in JP-A-6-161902, the name data is stored in the CD-ROM and the name data is stored in the disk cartridge.
In some cases, an AM is installed, and the name data of the CD-ROM and the name data of the RAM are collated with each other, and if they match, the progress of the video game is enabled.

In such a conventional video game device,
Even if the CD-ROM is duplicated and used in another video game device, the CD-ROM is stored in the RAM of the disc cartridge
If the same name data as the ROM is not stored,
I can't play video games. Therefore, the dead copy of the CD-ROM can be effectively prevented.

However, in such a conventional video game device, the contents of the data stored in the CD-ROM can be easily known, and therefore the name data may be removed and copied.

The present invention has been conceived under such circumstances, and its object is to satisfactorily prevent illegal duplication of an auxiliary storage medium.

[0006]

In order to solve the above problems, the present invention employs the following technical means.

In the data processing device according to the first aspect of the present invention, the auxiliary storage medium storing the program data encrypted based on a predetermined key code is mounted, so that the program data can be stored in the auxiliary storage medium. A read-out means for reading the data, a restoring means for restoring the program data read by the read-out means based on a predetermined key code, and an arithmetic processing means for performing various arithmetic operations based on the program data restored by the restoring means. ,,
It is characterized in that the restoring means and the arithmetic processing means are integrated into a one-chip IC.

In the video game device according to the second aspect of the present invention, an auxiliary storage medium in which program data for a video game encrypted based on a predetermined key code is stored is attached to the auxiliary storage medium. A reading unit that reads the program data from the medium, a restoring unit that restores the program data read by the reading unit based on a predetermined key code, and various arithmetic processes based on the program data restored by the restoring unit Accordingly, the present invention is characterized in that it comprises an arithmetic processing means for advancing a video game in accordance with an operation of an operator, and the restoring means and the arithmetic processing means are integrated into a one-chip IC.

A driving device for a video game device according to a third aspect of the present invention is a game cassette containing an auxiliary storage medium in which program data for a video game encrypted based on a predetermined key code is stored. Restoration means for restoring the program data read from the auxiliary storage medium on the basis of a predetermined key code, and various arithmetic processing based on the program data restored by the restoration means, thereby enabling the operator to operate A security cassette accommodating a one-chip IC in which arithmetic processing means for advancing a video game accordingly is integrated.

The security cassette according to the fourth aspect of the present invention is a restoring means for restoring encrypted program data based on a predetermined key code, and various operations based on the program data restored by the restoring means. It is characterized in that a one-chip IC integrated with an arithmetic processing means for performing processing is housed in a cassette.

The security cassette according to the fifth aspect of the present invention is a restoring means for restoring encrypted program data based on a predetermined key code, and various arithmetic processing based on the program data restored by the restoring means. And a RAM storing a key code
And a battery for maintaining the memory of the RAM and a switch means connected between the battery and the RAM are housed in a cassette, and when the cassette is disassembled, the switch means is opened to disconnect the battery from the RAM. It is characterized in that it is configured as.

The program data is a program for a game such as a video game, and the arithmetic processing means is
By performing various arithmetic processes on the basis of the program data restored by the restoring means, the video game progresses in accordance with the operation of the operator.

The auxiliary storage medium is, for example, a CD-ROM or a non-volatile memory.

The one-chip IC which constitutes the restoring means and the arithmetic processing means is housed in, for example, a security cassette, and the security cassette is removably attached to the circuit board of the data processing apparatus main body.

The one-chip IC may include, for example, a RAM storing a key code, in addition to the restoring means and the arithmetic processing means being integrally incorporated.

In the security cassette, for example, a RAM storing a key code, a battery for maintaining the memory of the RAM, and a switch means connected between the battery and the RAM are housed. When the cassette is disassembled, the switch means is opened and the connection between the battery and the RAM is cut off.

[0017]

OPERATION AND EFFECT OF THE INVENTION For example, a C in which program data encrypted based on a predetermined key code is stored.
A game cassette containing an auxiliary storage medium such as a D-ROM or a non-volatile memory is mounted on the circuit board of the video game apparatus main body, and the program data read from the auxiliary storage medium is restored based on a predetermined key code. One-chip in which the restoring means for performing the various kinds of arithmetic processing based on the program data restored by the restoring means and the arithmetic processing means for advancing the video game according to the operation of the operator are integrated. When the security cassette containing the IC is mounted on the circuit board of the main body of the video game device, the reading means reads the encrypted program data from the auxiliary storage medium, and the restoring means reads the encrypted program data based on a predetermined key code. Restored. The arithmetic processing means performs various arithmetic processing based on the program data restored by the restoring means. For example, if the program data is game software, the program is executed to generate video and audio of the video game, and the video game is advanced according to the operation of the joystick or the like by the player.

Since the restoring means and the arithmetic processing means are integrated into a one-chip IC, the contents of the restored program data cannot be known from the outside. That is, the encrypted program data can be known by checking the output of the reading means or the input of the one-chip IC, but the unencrypted program data is arithmetically processed from the restoring means inside the one-chip IC. Since it is supplied to the means and processed by the arithmetic processing means, various control signals are output from the arithmetic processing means to the outside of the one-chip IC, and the contents of the program data restored from the outside of the one-chip IC. Can't know.

Therefore, it is possible to satisfactorily prevent the restored program data from being illegally duplicated and used, for example, in another video game device not equipped with a security cassette.

Of course, even if an auxiliary storage medium such as a CD-ROM or a non-volatile memory is dead-copied, the program data stored in the auxiliary storage medium is encrypted, so that, for example, a security cassette is not provided. Can not be used for video game devices. Also,
Even a video game device equipped with a security cassette cannot be restored correctly unless the encryption key code and the restoration key code match.For example, changing the key code every time the contents of the video game change. hand,
By selling a game cassette and a security cassette as a drive device for driving a video game device as a set, even if an attempt is made to make a dead copy of the auxiliary storage medium of the game cassette and use it in combination with a security cassette for a different video game. , Can not play video games.

If the RAM storing the key code and the battery for maintaining the memory of the RAM are housed in the security cassette, the security cassette can be reused any number of times by rewriting the key code of the RAM. .

Further, the RAM in the security cassette is integrated with the restoring means and the arithmetic processing means into a one-chip IC so that only the RAM can be written from the outside of the one-chip IC, and the reading of the RAM is performed inside the one-chip IC. You may be allowed to do only. By doing so, the contents of the RAM, that is, the key code cannot be read from the outside of the one-chip IC, and the contents of the RAM, that is, the key code can be rewritten from the outside of the one-chip IC.

Further, if the switch means is connected between the battery and the RAM and the security cassette is disassembled, the switch means is opened to disconnect the connection between the battery and the RAM. RA
Since the memory contents of M are lost, it is possible to favorably prevent the act of disassembling the security cassette and illegally reading the key code of the RAM. In this case, even if the restoration means and the arithmetic processing means are not necessarily integrated into a one-chip IC, if the stored contents of the RAM are lost, normal restoration cannot be performed, so that the purpose of security can be achieved.

The data processing device or the video game device can be operated by inserting the security cassette into the insertion opening of the data processing device or the video game device or by removably mounting it on the circuit board. From the viewpoint of operability and security effect, the security cassette of the present invention can be advantageously and widely used.

As the auxiliary storage medium, any type of storage medium can be used. That is, CD-RO
M, MO (magneto-optical disk), hard disk, F
Non-volatile memory such as EEPROM, mask ROM, and ROM cartridge can be used.
CD-ROM or FEEPROM for the purpose of storing a large amount of programs such as game program data and data
Non-volatile memory such as is advantageous. In addition, FEEPR
OM is Flash Electrically Erasable and Programmab
Abbreviation for le ROM, also simply called flash memory.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below.
A specific description will be given with reference to the drawings.

FIG. 2 is a schematic block diagram of a video game device as an example of the data processing device according to the present invention.
The case of the video game apparatus body 1 has an insertion slot 4 for mounting a game cassette 3 containing a CD-ROM 2 as an example of an auxiliary storage medium and an insertion slot 6 for mounting a security cassette 5. The video game apparatus main body 1 is provided with a display device 7 having a display screen, a pair of speakers 8a and 8b arranged on both sides of the display device 7, and a pair of operation portions 9a and 9b.
And are connected. A joystick 10 and a plurality of push button switches 11 are installed on the operation units 9a and 9b, respectively. Display device 7 and speaker 8
In the case of a home video game device, a and 8b are often realized by a television receiver.

The video game device main body 1 includes a program read from the CD-ROM 2 in the game cassette 3, video information, audio information, and the like, and an operation unit 9 operated by the player.
Video signals and audio signals are output to the display device 7 and the speakers 8a and 8b based on the input signals corresponding to the operations of the joystick 10 and the push button switch 11 of a and 9b. In the CD-ROM 2, a video game program, video information, audio information, and the like are recorded in advance as digital data encrypted based on a predetermined key code, and the game cassette 3 is stored in the video game apparatus main body 1 It is possible to read the recorded information by inserting it into the insertion port 4 of. Game cassette 3
It contains a CD-ROM 2. The insertion slot 4 is for mounting the game cassette 3 in the video game apparatus body 1. The security cassette 5 is a CD-ROM 2
This is to restore the encrypted data recorded in 1. and control the entire video game device based on the restored program, the details of which will be described later. Insertion slot 6
Attaches the security cassette 5 to the video game device body 1
It is for mounting on. The display device 7 is
Based on a signal from the video game device body 1, images such as characters and backgrounds of the video game are displayed on the display screen. The speakers 8a and 8b are the video game device body 1
It is driven by an acoustic signal from to generate sound. That is, the acoustic signal based on the digital data recorded in the CD-ROM 2 is converted into vibration of air and transmitted to the hearing of the player. The operation units 9a and 9b are provided with a joystick 10 and a push button switch 11 operated by a player.
The operation signal is output to the video game device body 1. The game cassette 3 and the security cassette 5 are
It constitutes a drive device for driving the video game device.

FIG. 1 is a block diagram of the inside of the security cassette 5. Inside the security cassette 5, a restoration circuit 21, a CPU 22, a SRAM 23,
The ROM 24, the connector 25, and the battery 26 are housed. The restoration circuit 21 and the CPU 22 are integrally incorporated in the one-chip IC 27, and the micro switch 28 is interposed between the SRAM 23 and the battery 26.

The restoration circuit 21 restores the encrypted program data and the like from the CD-ROM 2 based on the key code from the SRAM 23. The CPU 22 is, for example, a 32-bit or 64-bit CISC or RIS
The CPU is a C type CPU, and based on the program data restored by the restoration circuit 21, advances the video game in accordance with the operation of the operation units 9a and 9b by the player. The SRAM 23 is a static RAM and is a CD
The same key code as that used when the program data or the like is encrypted and recorded in the ROM 2 is stored. The ROM 24 stores a program for the CPU 22 to read program data and the like stored in the CD-ROM 2. The connector 25 mates with a connector (not shown) installed inside the video game apparatus body 1 with the security cassette 5 inserted in the insertion opening 6 of the video game apparatus body 1. Battery 26
Holds the stored contents of the SRAM 23 and supplies power to the restoration circuit 21 and the CPU 22. One chip I
The C27 realizes the restoration circuit 21 and the CPU 22. The micro switch 28 is a security cassette 5.
The case is pressed and closed, and when the security cassette 5 is disassembled, the case is released from the pressing and opened. That is, the restoration circuit 21 constitutes a restoration unit that restores the program data encrypted based on the predetermined key code based on the predetermined key code, and the CPU 22 causes the program data restored by the restoration circuit 21. Based on the above, an arithmetic processing means for performing various arithmetic processing is configured. In addition, the micro switch 28 is
A switch means is connected between the battery 26 and the SRAM 23.

FIG. 3 is an overall configuration diagram centering on a circuit block of a video game device as an example of the data processing device of the present invention. Inside the video game device main body 1, a CD-ROM driver 31 and Character memory 3
2 and digital signal processor (hereinafter "DS
P ”), a sound memory 34, and a sound output means 35 having a DSP.
, Buffer memory 36, and sound controller 37
, Bus controller 39, and input interface 4
0 and 0 are provided, and these and the CPU 22 of the security cassette 5 are mutually connected by a bus line.

The CD-ROM driver 31 is a CD-RO.
The digital data recorded in M2 is read. The character memory 32 is C by the CD-ROM driver 31.
The video information regarding the character read from the D-ROM 2 and restored by the restoration circuit 21 is stored. The video output means 33 outputs a video signal to the display device 7 based on an instruction from the CPU 22. The sound memory 34 is stored in the CD-RO by the CD-ROM driver 31.
The sound wave data read from M2 and restored by the restoration circuit 21 is stored. The sound output means 35 outputs an acoustic signal to the speakers 8a and 8b based on the instruction from the sound controller 37. The buffer memory 36 temporarily stores various digital data. The sound controller 37 controls the sound output means 35 based on the instruction from the CPU 22. The bus controller 39 controls which of the various elements connected to the bus line is given the right to use the bus line. The input interface 40 includes operation units 9a and 9b.
Input the operation signal from. That is, the CD-ROM driver 31 is loaded with the game cassette 3 containing the CD-ROM 2 in which the program data encrypted based on a predetermined key code is stored, so that
It constitutes a reading means for reading the program data and the like from the D-ROM 2.

Next, the operation will be described. When the player inserts the game cassette 3 into the insertion opening 4 of the video game apparatus main body 1 and further inserts the security cassette 5 into the insertion opening 6 and performs a predetermined operation, the CPU 22 causes the ROM 24 to operate.
CD-ROM based on the program stored in
The driver 31 is controlled so that the data recorded in the CD-ROM 2 is read out and supplied to the restoration circuit 21 of the security cassette 5. As a result, the restoration circuit 21 causes the SR
Data from the CD-ROM 2 is restored by a predetermined process based on the key code stored in the AM 23. At this time, if a key code different from the key code used for encryption when recorded on the CD-ROM 2 is used for restoration, correct restoration is not performed and the CPU 22 does not operate normally. When the program data of the CD-ROM 2 is correctly restored by the restoration circuit 21, the CPU 22 sequentially executes the programs restored by the restoration circuit 21, and the video game is played in accordance with the operation of the operation units 9a and 9b by the player. Make progress. The video game program data restored by the restoration circuit 21 is not installed in the RAM.

That is, first, the CPU 22 controls the video output means 33, and the CD-ROM driver 31 drives the CD.
A video signal based on the video information read from the ROM 2 and restored by the restoration circuit 21 is displayed on the display device 7;
Output. As a result, a moving image is displayed on the display screen of the display device 7. Further, the CPU 22 controls the video output means 33 so that the player operates the operation units 9a, 9a.
Based on the operation of b, the character data is read from the character memory 32 and output to the display device 7. Thereby, on the display screen of the display device 7,
A moving image of the character corresponding to the operation of the player is displayed.

On the other hand, of the acoustic information read by the CD-ROM driver 31 and restored by the restoration circuit 21, the microprogram for the sound output means 35 is:
It is stored in the memory (not shown) of the sound output means 35 and controls the basic operation of the sound output means 35.
Of the acoustic information read by the CD-ROM driver 31 and restored by the restoration circuit 21, the sound wave data is stored in the sound memory 34, and the player can operate the joystick 10 and pushbuttons of the operation units 9a and 9b. When the switch 11 is operated, the CPU
Based on the instruction from the sound controller 37 which receives the instruction from the sound controller 22, the sound output means 35 reads the sound signal, converts it into an acoustic signal, controls the volume, and outputs the sound output means 35 to the speakers 8a and 8b. To be done.

By the above operation, the video and sound corresponding to the operation of the player are output, and the video game proceeds.

Since the restoration circuit 21 and the CPU 22 are integrally formed by the one-chip IC 27 as described above, the contents of the restored program data and the like cannot be known from the outside. That is, encrypted program data and the like can be known by checking the output of the CD-ROM driver 31 or the input of the one-chip IC 27, but unencrypted program data and the like of the one-chip IC 27. The restoration circuit 21 inside
Are supplied from the CPU 22 to the CPU 22 and processed by the CPU 22, various control signals are output from the CPU 22 to the outside of the one-chip IC 27.
The contents of the restored program data cannot be known from the outside of 7.

Therefore, it is possible to satisfactorily prevent the restored program data from being illegally copied and used, for example, in another video game device which does not have the security cassette 5.

Of course, even if the CD-ROM 2 is dead-copied, the program data and the like stored in the CD-ROM 2 are encrypted, so that the CD-ROM 2 is used for another video game device not equipped with the security cassette 5, for example. It is not possible. In addition, even a video game device equipped with the security cassette 5 cannot be correctly restored unless the encryption key code and the restoration key code match. Therefore, for example, the key is changed every time the contents of the video game change. By changing the code and selling the game cassette 3 as a driving device for driving the video game device and the security cassette 5 as a set, the CD-ROM 2 of the game cassette 3 is dead-copied to provide security for different video games. Even if an attempt is made to use it in combination with the cassette 5, a video game cannot be played.

If the security cassette 5 contains the SRAM 23 storing the key code and the battery 26 for maintaining the memory of the SRAM 23, the SRAM 2
By rewriting the key code of 3, the security cassette 5 can be reused any number of times.

Furthermore, if a micro switch 28 is connected between the battery 26 and the SRAM 23 and the security cassette 5 is disassembled, the micro switch 28 is opened and the connection between the battery 26 and the SRAM 23 is cut off. SRAM 23 when the security cassette 5 is disassembled
Therefore, it is possible to favorably prevent the act of disassembling the security cassette 5 and illegally reading the key code of the SRAM 23, for example.

Although the CD-ROM 2 is used as the auxiliary storage medium in the above embodiment, it goes without saying that any other type of storage medium can be used. That is, MO
(Magneto-optical disk), hard disk, FEEPR
Non-volatile memory such as OM, mask ROM, and ROM cartridge can be used, but in particular, non-volatile memory such as CD-ROM or FEEPROM is intended to store a large amount of programs and data such as game program data. It is advantageous.

In the above embodiment, the game cassette 3 is used.
The security cassette 5 and the security cassette 5 are configured to be inserted into the insertion opening 4 and the insertion opening 6 of the video game apparatus body 1. However, in the case of a commercial video game apparatus, a connector or the like is provided on the circuit board inside the video game apparatus body 1. The game cassette 3 and the security cassette 5 are provided in this connector.
May be attached. Furthermore, without housing the one-chip IC 27 in the security cassette 5,
The circuit board in the video game apparatus body 1 may be directly mounted by soldering or a socket.

Although the SRAM 23 of the security cassette 5 is not incorporated in the one-chip IC 27 in the above embodiment, the SRAM 23 is incorporated in the one-chip IC 27 so that only the SRAM 23 can be written from the outside of the one-chip IC 27 and the SRAM 23 can be read out. May be configured so that only the restoration circuit 21 can be performed inside the one-chip IC 27. By doing this, one-chip IC
The contents of the SRAM 23, that is, the key code cannot be read from the outside of the 27, and the contents of the SRAM 23, that is, the key code can be rewritten from the outside of the one-chip IC 27.

Further, in the above embodiment, the restoration circuit 21 and C
Although the PU 22 and the PU 22 are integrated into the one-chip IC 27, if the microswitch 28 is provided and the security cassette 5 is disassembled as in the above-described embodiment, the SRAM 23 is obtained.
In the case where the memory contents of C are deleted, the restoration circuit 21 cannot be restored normally by disassembling the security cassette 5, so that the restoration circuit 21 and C are not always necessary.
It is not necessary to incorporate the PU 22 into the one-chip IC 27 integrally.

In the above embodiment, all the data is encrypted and stored in the CD-ROM 2, but only the program data is encrypted and written to the CD-ROM 2, and the other data is not encrypted and the CD-ROM 2 is not encrypted. You may write in. Even in this case, as long as the program data is encrypted, the CPU 22 does not operate normally and the video game cannot proceed unless it is restored by the restoration circuit 21.

In the above embodiment, the video game device has been described as an example of the data processing device, but it goes without saying that the present invention can be applied to various data processing devices other than the video game device.

[Brief description of drawings]

FIG. 1 is a block diagram of the inside of a security cassette provided in a video game device as an example of a data processing device according to the present invention.

FIG. 2 is a schematic configuration diagram of a video game device as an example of a data processing device according to the present invention.

FIG. 3 is an overall configuration diagram centering on a circuit block of a video game device as an example of a data processing device according to the present invention.

[Explanation of symbols]

 2 CD-ROM 5 Security cassette 21 Restoration circuit 22 CPU 23 SRAM 26 Battery 27 One-chip IC 28 Micro switch 31 CD-ROM driver

Claims (14)

[Claims] 1. A reading means for reading the program data from the auxiliary storage medium by mounting an auxiliary storage medium storing program data encrypted on the basis of a predetermined key code, and the reading means. The restoring unit includes a restoring unit that restores the read program data based on the predetermined key code, and an arithmetic processing unit that performs various arithmetic processes based on the program data restored by the restoring unit. A data processing device, characterized in that: and the arithmetic processing means are integrated into a one-chip IC. 2. The data processing device according to claim 1, wherein the auxiliary storage medium is a CD-ROM or a non-volatile memory. 3. The one-chip IC constituting the restoring means and the arithmetic processing means is housed in a cassette, and the cassette is detachably attached to a circuit board of a data processing apparatus main body. The data processing device according to claim 1 or 2. 4. The cassette contains a RAM storing the key code, a battery for maintaining the memory of the RAM, and a switch means connected between the battery and the RAM, and the cassette. 4. The data processing device according to claim 3, wherein the switch means is opened to disengage the connection between the battery and the RAM when the battery is disassembled. 5. A reading means for reading the program data from the auxiliary storage medium by mounting an auxiliary storage medium storing program data for a video game encrypted based on a predetermined key code. A restorer that restores the program data read by the read-out unit based on the predetermined key code, and various arithmetic operations based on the program data restored by the restorer A video game device comprising: an arithmetic processing unit for advancing a video game in accordance with the above, wherein the restoring unit and the arithmetic processing unit are integrated into a one-chip IC. 6. The video game device according to claim 5, wherein the auxiliary storage medium is a CD-ROM or a non-volatile memory. 7. The one-chip IC constituting the restoring means and the arithmetic processing means is housed in a cassette, and the cassette is detachably mounted on a circuit board of a video game apparatus main body. The video game device according to claim 5 or claim 6. 8. The cassette contains a RAM storing the key code, a battery for maintaining the memory of the RAM, and a switch means connected between the battery and the RAM, and the cassette. 8. The video game device according to claim 7, wherein the switch means is opened when the battery is disassembled to disconnect the connection between the battery and the RAM. 9. A game cassette containing an auxiliary storage medium in which program data for a video game encrypted based on a predetermined key code is stored, and the program data read from the auxiliary storage medium is the predetermined. Restoration means to restore based on the key code of,
Security including a one-chip IC integrated with an arithmetic processing unit for advancing a video game in accordance with an operation of an operator by performing various arithmetic processes based on the program data restored by the restoring unit A drive device for a video game device, which comprises a cassette and. 10. The drive device of the video game apparatus according to claim 9, wherein the auxiliary storage medium is a CD-ROM or a non-volatile memory. 11. A RAM storing the key code, a battery for maintaining the memory of the RAM, and a switch means connected between the battery and the RAM are housed in the security cassette. 11. The drive device for a video game device according to claim 9, wherein the switch means is opened when the security cassette is disassembled to disconnect the connection between the battery and the RAM. 12. A restoring means for restoring encrypted program data based on a predetermined key code, and an arithmetic processing means for performing various arithmetic operations on the basis of the program data restored by the restoring means. A security cassette characterized in that the integrated one-chip IC is housed in the cassette. 13. A RAM storing the key code,
13. The security cassette according to claim 12, wherein the security cassette and the calculation processing unit are integrated into a one-chip IC. 14. A restoring unit that restores encrypted program data based on a predetermined key code, an arithmetic processing unit that performs various arithmetic processes based on the program data restored by the restoring unit, and the key. A RAM storing a code, a battery for maintaining the memory of the RAM, and a switch means connected between the battery and the RAM are housed in a cassette, and when the cassette is disassembled, the switch means is opened. The security cassette is characterized in that the connection between the battery and the RAM is cut off.