JPH11219291A - License card manufacturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a license card manufacturing system of for preventing decoding key data from being illegally used by a third person. SOLUTION: In this manufacture system of the license card for writing the decoding key data from a master IC card for storing at least the decoding key data for decoding ciphered program data and duplication number-of-times data to an IC card and performing duplication, when the decoding key data are written to the IC card, the decoding key data ciphered based on prescribed common key data are outputted from the master IC card. The ciphered decoding key data are restored by the common key data and stored in the IC card and the duplication number-of-times data are subtracted every time the write is executed into the IC card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
License card for preventing unauthorized use of program data such as game software stored in a storage medium such as VD
The method relates to a method of manufacturing a metal.

[0002]

2. Description of the Related Art In recent years, illegal use of illegally copying and using program data such as game software stored in a storage medium such as a CDROM or a DVD has become a social problem.

As a method for preventing such unauthorized use, program data stored in a storage medium such as a CDROM or DVD is encrypted and stored, and decryption key data for decrypting the encrypted program data is used. Unless (license key data) is obtained, a method has been proposed in which encrypted program data cannot be decrypted into plaintext data, thereby preventing unauthorized copying and use.

However, when such decryption key data (license key data) is used, even if the encrypted program data itself is copied, it cannot be used as it is.
If the decryption key data (license key data) is stolen or obtained by a third party, it can easily be used illegally. Therefore, the decryption key data (license key data) is stolen. So that you do not
It had to be distributed to thers.

In order to solve these plagiarism problems, in recent years, these decryption key data (license key data) have been
It is stored in an electronic storage medium such as a card, distributed to each user as a license card, and decryption key data (license key data) is made unknown to the user. Attempts have been made to make program data unusable without an IC card.

[0006]

However, the method of distributing decryption key data (license key data) using these IC cards can prevent theft of decryption key data (license key data) in a centralized manner. Usually, these license cards are provided at each store or the like.
Since the decryption key data (license key data) is written on the C card, there is a problem that the decryption key data (license key data) is highly likely to be stolen during writing on these IC cards. .

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to prevent decryption key data (license key data) from being stolen by a third party even when writing to an IC card. The purpose of the present invention is to provide a method for producing a license card without a license.

[0008]

In order to solve the above-mentioned problems, a method for producing a license card according to the present invention comprises at least decryption key data for decrypting encrypted program data and the number of copies. This is a method for producing a license card for writing and copying the decryption key data to an IC card from a master IC card that stores data, and the decryption key data is written to the IC card. In this case, decryption key data encrypted based on predetermined common key data is output from the master IC card, and the encrypted decryption key data is output to the IC card. It is restored and stored by common key data, and the copy number data is decremented each time the writing is performed on the IC card. According to this feature, when the decryption key data is written from the master IC card to the IC card, the decryption key data output from the master IC card is encrypted by the common key data. Output
It is possible to prevent the decryption key data itself from being stolen by a third party.

The method of manufacturing the license card of the present invention is as follows.
Master IC storing at least decryption key data for decrypting encrypted program data and data on the number of copies
A method of producing a license card for writing the decryption key data on an IC card from a card and duplicating the same. When the decryption key data is written on the IC card, Decryption key data encrypted based on predetermined common key data is output, and each time data is written to the IC card, the duplication count data is subtracted and the IC card is rewritten. Is characterized in that the encrypted decryption key data and the common key data are stored, and the encrypted decryption key data is restored by the common key data as required. And According to this feature, when the decryption key data is written from the master IC card to the IC card, the decryption key data output from the master IC card is encrypted by the common key data. Since the output, the decryption key data itself can be prevented from being stolen by a third party, and the decryption key data is also stored in an encrypted state inside the IC card. Therefore, even if the encrypted decryption key data is read from the inside of the IC card, it is possible to prevent the decryption key data itself from being stolen by a third party.

The method of manufacturing the license card of the present invention is as follows.
It is preferable that the common key data is generated every time writing to the IC card is performed. With this configuration, different common key data is generated each time the decryption key data is written to the IC card, and the decryption key data encrypted by the common key data is also generated each time. Since they are different, it is possible to make it more difficult for a third party to obtain the decryption key data, and it is possible to realize higher security.

The method of manufacturing the license card of the present invention is as follows.
It is preferable that identification data such as an ID is stored in the IC card, and the master IC card authenticates the identification data at the time of writing. This can prevent the decryption key data from being written to an unauthorized IC card.

The method of manufacturing the license card of the present invention is as follows.
The identification data such as the ID is encrypted and output from the IC card based on the predetermined common key data, and is restored by the common key data in the master IC card. Is preferred. In this way, it is possible to prevent the identification data such as the ID stored in the authorized IC card from being stolen and used by a third party.

The method of manufacturing the license card of the present invention is as follows.
In the master IC card, identification data such as an ID unique to each master IC card and encryption key data associated with the identification data are stored.
When the decryption key data and the copy count data are written to the IC card, the identification data of the master IC card is used.
The decryption key data is read out, and the decryption key data and the number of times of duplication data are encrypted by the encryption key data corresponding to the identification data, written, stored, and, if necessary, the encrypted decryption key. It is preferable that data and the number of times of copying be restored by the encryption key data.
With this configuration, the decryption key data and the number of times of copying data stored inside the master IC card are stored and stored in a state encrypted by the encryption key data. Therefore, even if the stored contents are stolen from these master IC cards, not only can the decryption key data itself be prevented from being stolen by a third party, but also the unauthorized access by falsifying the data on the number of times of copying, etc. Can also be prevented.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is an external perspective view showing the appearance of a license card issuing apparatus using the license card manufacturing method of the present invention in Embodiment 1 and FIG.
FIG. 3 is a block diagram showing the configuration of the license card issuing device and the master IC card and the IC card according to the first embodiment. FIG. 3A is a block diagram showing the master IC according to the first embodiment. FIG. 3B is a block diagram showing the configuration and processing contents of a cryptographic processing unit used for the card. FIG. 3B shows an IC card according to the first embodiment.
FIG. 4 is a block diagram showing the configuration and processing contents of an encryption processing unit used for the card. FIG. 4 shows the processing operation of the license card issuing apparatus and the master IC card and the IC card according to the first embodiment. FIG.

In the first embodiment, the method for producing a license card according to the present invention is applied to a license card issuing apparatus.

The license card issuing device 1 of the present embodiment.
Has an appearance as shown in FIG.
A master IC card reader / writer 2 for inserting a C card 6 and an IC card 8 on which decryption key data (license key data) is written and issued as a license card are inserted. An IC card reader / writer 3 is provided on the front face, and a display section 4 for displaying an operation status, a message, and the like, and an issue switch 5 for writing decryption key data are provided on the top face. ing.

The configuration of the master IC card 6, the IC card 8, and the license card issuing device 1 is as shown in FIG. An IC 7 is built-in, and in the inside of the IC 7, as a storage unit for storing the decryption key data and the number of times of copying, an EEPROM unit 14 which is a nonvolatile memory is provided.
A memory unit 15 used for various operations, etc .; a cipher generating unit 16 for generating cipher generation information data and common key data based on a predetermined algorithm described later and encrypting the decryption key data; Master IC card reader
A communication unit 13 for exchanging data with the writer 2
And a control unit 12 for controlling these units is provided. In the first embodiment, the EEPROM unit 14 includes:
An ID assigned to a legitimate IC card to which the decryption key data is written is stored in advance.

The IC card 8 has a built-in IC 9, and the IC card 8 is provided with a unique ID in the first embodiment.
EEPR, which is a non-volatile memory that stores the decryption key data and the ID and the like restored by the encryption generation unit 21 described below.
An OM unit 19, a memory unit 20 used in various operations and the like, and a cipher for generating cipher generation information data and common key data based on a predetermined algorithm described later and restoring the encrypted decryption key data. A generation unit 21;
A communication unit 17 for exchanging data with the C card reader / writer 3 and a control unit 18 for controlling these units are provided.
The ID data assigned to the C card 8 is stored in advance.

The license card issuing device 1 includes:
The master IC card reader / writer 2, the IC card reader / writer 3, an LCD panel 4 as a display unit, and an LCD driver 1 for controlling the display operation of the LCD panel 4.
1, an issue switch 5, and a microprocessing unit (MPU) 10 for controlling these units. An internal ROM (not shown) is provided inside the MPU 10, and the control operation performed by the MPU 10 is described. The stored program is stored and stored in advance.

The cipher generator 16 incorporated in the IC 7 has a process as shown in FIG. 3A, and based on the random number (XA) generated by the random number generator, A power-residue calculating unit generates encryption generation information data (YA) of a predetermined length by a power-residue calculation, and the encryption generation information data (YA) generated by the encryption generation unit 16 is transmitted to the communication unit 13.
The data is output to the IC card 8 via the master IC card reader / writer 2, the license card issuing device 1, and the IC card reader / writer 3, and the IC card 8
Also, as shown in FIG. 3B, the encryption generation information data (YB) generated by the encryption generation unit 21 built in the IC 9 by the same algorithm as the encryption generation unit 16 is output, as shown in FIG. It is input to the modular exponentiation operation unit of the encryption generation unit 16 and the encryption generation information data (Y
B) and a random number (XA) generated by the random number generation unit
Are subjected to power-residue calculation by a power-residue calculation unit to generate common key data (KAB), and are stored in the EEPROM unit 14 based on the common key data (KAB). The decryption key data is encrypted by the encryption processing unit.

Further, as shown in FIG. 3 (b), the cipher generator 21 built in the IC 9 of the IC card 8 has a configuration similar to that of the cipher generator 16. And the random number (X
On the basis of B), a predetermined length of cryptographic generation information data (YB) is generated by a power-residue calculation by a power-residue calculation unit, and the master card is generated from the IC card 8 via the license card issuing device 1 by the IC card 8. The encryption generation information data (YA) generated and output by the encryption generation unit 16 of the master IC card 6 is output to the encryption generation unit 16 in the same manner as the encryption generation unit 16. The code generation information (YA) and the random number (XB) generated by the random number generation unit are input to the power remainder calculation unit of the unit 21, and the code generation is performed by the power remainder calculation unit by the power remainder calculation unit. The common key data (KA
The same common key data (KAB) as that of B) is generated, and based on this common key data (KAB), the encrypted decryption key data is restored by the encryption processing operation unit. It has become.

The exchange of data and the like between the master IC card 6, the license card issuing device 1 and the IC card 8 is as shown in FIG. -Card 6 and IC card 8 are license cards
When inserted into the card issuing device 1, the insertion of each of these cards is detected, and the MPU 10 of the license card issuing device 1 outputs an instruction to output ID data to the IC card 8.

Based on the output, the IC card 8
The control unit 18 incorporated in the ROM 9 reads out the ID data stored in advance in the EEPROM unit 19 and outputs it to the master IC card 6 via the communication unit 17 and the license card issuing device 1. .

In response to the output of the ID data, the master
The control unit 12 built in the IC 7 of the IC card 6
The ID data is retrieved from the ID data stored in the EEPROM unit 14 in advance, compared with the ID data, authentication is performed, it is checked whether the number of duplications remains, and the authentication result is transmitted to the license card issuing device. Output to 1.

The MPU 10 determines that the authentication result is “No”.
In the case of (1), it is displayed on the LCD panel 4 that the IC card 8 to be written is not a proper one,
When the processing ends and the authentication result is “OK”, LC
A message "Please press the issue switch" is displayed on the D panel 4, the input of the issue switch 5 is waited for a predetermined time, and if the issue switch 5 is not input within the predetermined time, each card is ejected and processed. To end.

If the issuing switch 5 is input within the predetermined time, the MPU 10 outputs the encryption generation information data for generating the common key data to the master IC card 6 and the IC card 8. To instruct.

In response to this instruction, the master IC card 6
And the control units 12 and 18 of the IC card 8 instruct the encryption generation units 16 and 21 to generate encryption generation information data. In the encryption generation units 16 and 21, as described above, the random number generation unit Random numbers (XA) and (XB) are generated, which are subjected to a power-residue operation in a power-residue operation unit to generate encryption generation information data (YA) and (YB), which are output to the control units 12 and 18, The control units 12 and 18
These encryption generation information data (YA) and (YB) are output to the IC card 8 and the master IC card 6 via the communication units 13 and 17 and the license card issuing device 1.

The output cipher generation information data (YB) and (YA) are stored in the master IC cards 6 and I, respectively.
Each of the cryptographic generators 16 and 21 of the C-card 8 is input to each of the modular exponentiation units, and the random numbers (XA) and (XB) generated by each of the random number generators are subjected to modular exponentiation and the common key data (KAB) is generated.

The MPU 10 outputs the encryption generation information data (YA) and (YB) and then outputs the master IC
A request to output the encrypted decryption key data is output to the card 6, and the control unit 12 of the master IC card 6 uses the common key data (KAB) generated as described above based on this instruction. The decryption key data read from the EEPROM section 14 is encrypted by the encryption processing operation section, and the encrypted decryption key data is output to the IC card 8 via the license card issuing device 1. At the same time, the copy number data is updated by subtracting 1 from the copy number data stored in the EEPROM unit 14.

The encrypted decryption key data output in this manner is input to the encryption generation unit 21 of the IC card 8, and is subjected to encryption processing operation by the generated common key data (KAB). Is restored to the decryption key data, and the restored decryption key data is stored in the EEPROM unit 19.

When the restoration and storage of the decryption key data are completed, the control unit 18 of the IC card 8 outputs to the license card issuing device 1 that the writing of the decryption key data is completed, and this output is output. Then, the MPU 10 discharges each card and ends the processing.

In the first embodiment, as described above, every time the common key data is written into the IC card 8, the common key data is changed by exchanging the encryption generation information data. However, the present invention is not limited to this, and the common key data may be fixed or master IC card or IC card.
The fixed encryption generation information data may be assigned to each key. However, according to the first embodiment, different common key data is generated each time, and decryption is performed using the common key data. Since the key data is also different, it is preferable because it is possible to make it more difficult for a third party to steal the decryption key data and to realize higher security.

(Embodiment 2) FIGS. 5A and 5B show
FIG. 6 is a block diagram showing the configuration and processing contents of a cipher generator 16 'built in the IC 7 of the master IC card 6 in the second embodiment. FIG. 6 shows the IC 9 of the IC card 8 in the second embodiment. FIG. 7 is a block diagram showing the configuration and processing contents of a cryptographic generator 21 'incorporated in the license card issuing apparatus 1 and the master IC of the second embodiment.
FIG. 6 is a diagram showing processing operations of a card 6 and an IC card 8;

The structure of the second embodiment is substantially the same as that of the first embodiment. The feature of the second embodiment is that the decryption key stored in the EEPROM 14 of the master IC card 6 is stored. There is a great difference in that the data is stored in an encrypted state and the ID data output from the IC card 8 is encrypted and output by the common key data. In order to restore these encrypted decryption key data and encrypt ID data,
The encryption generating units 16 and 21 of the master IC card 6 and the IC card 8 have been changed to the encryption generating units 16 'and 21' as shown in FIGS. The program of the internal ROM (not shown) provided inside the MPU 10 of the issuing device 1 has also been changed.

Master I used in the second embodiment
An ID, which is a unique identification code, is assigned to the C card 6 in advance, and the ID and encryption key data associated with the ID are stored in the EEPROM unit 14 in advance.

When the decryption key data (PT) and the copy count data are written in the master IC card 6, the ID data of the master IC card 6 is read out and associated with this ID. Encryption key data (K
P), the decryption key data (PT) and the copy number data are encrypted and written based on a predetermined algorithm, and the encrypted decryption key data (PA) and the encrypted copy number data are stored in the EEPROM unit 14. .

Accordingly, the IC of the master IC card 6
As shown in FIG. 5A, an encryption generation unit 16 'built in the encryption processing operation unit encrypts the decryption key data based on the encryption key data (KP) stored in the EEPROM unit 14. (PA) and the encrypted copy number data are restored to the decryption key data (PT) and the copy number data, and are output from the IC card 8 as shown in FIG. The encrypted ID data encrypted with the common key data (KAB) is
B) is restored to ID data.

Further, as shown in FIG. 6, the cryptographic generator 21 'built in the IC 9 of the IC card 8 also includes an IC card in addition to the processing of the cryptographic generator 21 of the first embodiment. The ID data of each IC card stored in the EEPROM section 19 of the memory card 8 is converted into encrypted ID data by using common key data (KAB).

The master IC card 6 in the second embodiment
The exchange of data and the like between the license card issuing device 1 and the IC card 8 is as shown in FIG. 7, and the master IC card 6 and the IC card 8 communicate with each other. When the card is inserted into the license card issuing device 1, the insertion of each of these cards is detected.
The MPU 10 of the license card issuing device 1 outputs a request to output encryption generation information data to the C card 8.

Based on this output, the control units 12 and 18 of the master IC card 6 and the IC card 8 transmit the encryption generation information data (YA) and (YB) in the same manner as in the first embodiment.
Is instructed to each of the encryption generation units 16 'and 21', and the generated encryption generation information data (YA) and (YB) are transmitted via the license card issuing device 1 to the IC card 8 and the master IC. The shared key data (KAB) is generated on the basis of the output encryption generation information data (YA) and (YB).

Next, the MPU 10 stores the ID in the IC card 8.
Instructing the data output, the control unit 18 of the IC card 8 instructs the encryption generation unit 21 'to encrypt the ID data read from the EEPROM unit 19 based on the common key data (KAB). And outputs the encrypted ID data to the master IC card 6 via the license card issuing device 1.

In the master IC card 6, the encryption I
D data is input to the encryption generation unit 16 'as described above,
The ID data is restored by using the common key data (KAB), and the encrypted copy number data is read out from the EEPROM unit 14. This is restored to the copy number data by the encryption key data (KP). In addition, the authentication is performed on the copy number data in the same manner as in the first embodiment, and the result is output to the license card issuing device 1. When the authentication result is "OK",
The decryption of the decryption key data (PA) stored in the EEPROM 14 in an encrypted state
6 'and decryption key data (PT) is restored by the encryption processing operation unit based on the encryption key data (KP) stored in the EEPROM unit 14.

The MPU 10 determines that the authentication result is “No”.
In the case of (1), it is displayed on the LCD panel 4 that the IC card 8 to be written is not a proper one,
When the processing ends and the authentication result is “OK”, LC
A message "Please press the issue switch" is displayed on the D panel 4, the input of the issue switch 5 is waited for a predetermined time, and if the issue switch 5 is not input within the predetermined time, each card is ejected and processed. To end.

When the issuing switch 5 is input within the predetermined time, the MPU 10 requests the master IC card 6 to output the encrypted decryption key data (PB).

By this output, the control unit 12 converts the decrypted key data (PT) restored as described above into the common key data (KAB).
An instruction to perform encryption is issued to the encryption generation section 16 'based on the above, and the encrypted decryption key data (PB) encrypted by this is output to the IC card 8 via the license card issuing device 1, and The data is updated by subtracting 1 from the data on the number of times of copying, and is updated based on the encryption key data (KP) and stored in the EEPROM unit 14 again.

The IC card 8 stores the encrypted decryption key data (PB) in the EEPROM 19 and
The cipher generation information data (YA) and the random number data (X
B), and the control unit 18 of the IC card 8 outputs to the license card issuing device 1 that the writing of the decryption key data has been completed. Based on this output, the MPU 10
Each card is ejected, and the process ends.

The EEPROM 19 of these IC cards 8
The encrypted decryption key data (PB) stored in the common key data (KAB) is stored in the
To be used as decryption key data (PT).

According to the second embodiment, the master IC
EEPROM as storage means for card and IC card
The decryption key data is stored in an encrypted state, and is restored and used as necessary.
In addition to preventing the decryption key data itself from being stolen by the C card and the IC card, the ID data output from the IC card is also encrypted and output by the common key data. Therefore, it is possible to prevent the ID data from being illegally stolen by a third party and the decryption key data being copied to an unauthorized IC card.

In the second embodiment, the EEP
Although the ROM section 19 stores the encryption generation information data (YA) and the random number data (XB), the common key data (KAB) itself may be stored. Storing the generation information data (YA) and the random number data (XB) is preferable because it is possible to prevent the common key data (KAB) itself from being read and the decryption key data (PB) from being restored. .

In the second embodiment, the encryption / decryption key data (PA) encrypted with the encryption key data is encrypted and encrypted by the encryption generation unit using the same algorithm as the encryption with the common key data. Although the restoration is performed, the present invention is not limited to this. The encryption / decryption key data (PA) may use an algorithm different from the encryption using the common key data. 2
It is preferable to use a common configuration as described above because the device configuration can be simplified.

Although the present invention has been described with reference to the drawings, the present invention is not limited to these embodiments, and changes and additions may be made without departing from the spirit of the present invention. Needless to say, this is included in the present invention.

In this embodiment, the common key data is generated by exchanging the encryption generation information data.
The present invention is not limited to this, and the common key data may be generated by other methods, for example, by exchanging initial value data for random number generation.

Further, in this embodiment, the decryption key data is stored in a non-volatile EEPROM unit. However, the present invention is not limited to this. Non-volatile memory, for example, ferroelectric memory (Fe
RAM), a flash memory, or the like.

[0055]

The present invention has the following effects.

(A) According to the first aspect of the present invention, the master
When the decryption key data is written from the IC card to the IC card, the decryption key data output from the master IC card
Since the data is output after being encrypted by the common key data, it is possible to prevent the decryption key data itself from being stolen by a third party.

(B) According to the second aspect of the present invention, the master
When the decryption key data is written from the IC card to the IC card, the decryption key data output from the master IC card
Since the data is encrypted and output by the common key data, not only can the decryption key data itself be stolen by a third party but also the decryption key data can be stored inside the IC card. -Since the encrypted data is stored in an encrypted state, even if the encrypted decryption key data is read from the inside of the IC card, the decryption key data itself can be read by a third party. It can also prevent plagiarism.

(C) According to the third aspect of the present invention, different common key data is generated each time the decryption key data is written to the IC card, and the common key data is encrypted by this common key data. Since the decryption key data is also different each time, it becomes more difficult for a third party to obtain the decryption key data, and higher security can be realized. .

(D) According to the invention of claim 4, the illegal I
It is possible to prevent decryption key data from being written to the C card.

(E) According to the invention of claim 5, the regular I
It is possible to prevent identification data such as an ID stored in the C card from being stolen and used by a third party.

(F) According to the sixth aspect of the present invention, the master
Since the decryption key data and the number-of-times-of-copy data stored inside the IC card are stored and stored in a state of being encrypted by the encryption key data, the master key card is Even if the stored contents are plagiarized, not only the decryption key data itself can be prevented from being stolen by a third party, but also the improper operation by falsifying the data on the number of times of copying can be prevented.

[0062]

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an external appearance of a license card issuance device using a license card manufacturing method of the present invention in a first embodiment.

FIG. 2 is a block diagram showing a license card issuing device, a master IC card, and each configuration of the IC card according to the first embodiment of the present invention.

FIG. 3A illustrates a master IC according to the first embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration and processing contents of an encryption processing unit used for a card. FIG. 3B is a block diagram illustrating a configuration and processing contents of an encryption processing unit used for the IC card according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a processing operation of a license card issuing device and a master IC card and an IC card according to the first embodiment of the present invention.

FIGS. 5A and 5B are block diagrams showing the configuration and processing contents of an encryption generation unit built in the IC of the master IC card according to the second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration and processing contents of a cipher generation unit built in an IC of an IC card according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a license card issuing device and a processing operation of a master IC card and an IC card according to the second embodiment of the present invention.

[Explanation of symbols]

 1 License Card Issuing Device 2 Master IC Card Reader / Writer 3 IC Card Reader / Writer 4 LCD Panel 5 Issue Switch 6 Master IC Card 7 IC 8 IC Card 9 IC 10 Micro Processing Unit (MPU) 11 LCD Driver 12 Control unit 13 Communication unit 14 EEPROM unit 15 Memory unit 16 Encryption generation unit 16 'Encryption generation unit 17 Communication unit 18 Control unit 19 EEPROM unit 20 Memory unit 21 Encryption generation unit 21' Encryption generation unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04L 9/32 H04L 9/00 673E 673C

Claims (6)

[Claims] 1. At least encrypted program data
A method for producing a license card for writing the decryption key data on an IC card from a master IC card storing decryption key data for decrypting data and data on the number of times of copying, and copying the data. When the decryption key data is written to the IC card, decryption key data encrypted based on predetermined common key data is output from the master IC card.
The encrypted decryption key data is restored and stored by the common key data in the IC card, and the copy number data is subtracted every time the writing is performed on the IC card. A method for producing a license card. 2. At least encrypted program data
A method for producing a license card for writing the decryption key data on an IC card from a master IC card storing decryption key data for decrypting data and data on the number of times of copying, and copying the data. When the decryption key data is written to the IC card, decryption key data encrypted based on predetermined common key data is output from the master IC card.
Each time writing is performed on the IC card, the data on the number of times of duplication is subtracted, and the IC card contains:
The encrypted decryption key data and the common key data are stored, and the encrypted decryption key data is restored by the common key data as needed. How to make a license card. 3. The license card producing method according to claim 1, wherein the common key data is generated each time writing to an IC card is performed. 4. An identification data such as an ID is stored in the IC card.
The authentication of this identification data is performed.
4. A method for producing a license card according to any one of Items 1 to 3. 5. The identification data such as the ID and the like are encrypted and output from the IC card based on the predetermined common key data, and are restored by the common key data in the master IC card. 5. The method for producing a license card according to claim 4, wherein 6. The master IC card stores identification data such as an ID unique to each master IC card and encryption key data associated with the identification data.
When the decryption key data and the copy count data are written to the master IC card, the identification data of the master IC card is read, and the encryption key data corresponding to the identification data is read. To obtain the decryption key data and the copy number data.
The encrypted data is written and stored in an encrypted form, and the encrypted decryption key data and copy number data are restored by the encryption key data as necessary. 6. A method for producing a license card according to any one of claims 1 to 5.