JP2001184789A - Optical information recording medium, method and system for holding information secrecy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium, a method and a system for holding information secrecy, with which the illegal use or the like of recorded information can be prevented. SOLUTION: When recording information on a CD-R 16, in addition to digital data 31, an automatic install program 32 and an operation control program 33 are written together. When the CD-R 16 is loaded into an information reproducing device, the automatic install program 32 is automatically started and the operation control program is made resident and started in the memory of the information reproducing device. When operation to digital data written on the CD-R 16 is detected, the operation control program 33 calls the entry of a password by interrupting this operation and when the inputted password is a regular password, interrupted operation is continued.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium having improved information security capability, an information security method, and a system therefor.

[0002]

2. Description of the Related Art In recent years, various electronic devices including personal computers and audio-visual devices have been remarkably developed, and high-performance, low-cost products of this type have become widespread. Along with this, digital data used in personal computers and audio / visual devices is also diversified, and sales and distribution of software products such as digital data are also increasing.

On the other hand, office work and the like are mostly performed using a computer, and the amount of digital data to be handled is enormous. For this reason, it is common practice to back up data on an information recording medium such as a CD-R in case of emergency.

[0004] Under such circumstances, the number of people who can handle computers has increased rapidly, and digital data can be easily copied. Therefore, a duplicate of the original digital data is illegally created and given to another person. Redistribution or confidential information may be leaked.

In order to prevent such unauthorized use, data encryption techniques and techniques generally called digital watermarks have been studied.

[0006] Data encryption is a technology that has been developed mainly to protect the data itself when a plurality of persons exchange data in a computer network. A malicious third party acquires and uses the data. It is used to prevent the data from being tampered with or tampered with.

When this encryption technique is used, the encrypted data can be decrypted only by a person who exchanges the data, and even if the data is acquired by a third party, the contents cannot be decrypted.

[0008] As this encryption technique, a common key method in which an encryption key used when data is encrypted is commonly used when decrypting encrypted data, and a key for encryption is used as a public key by others. In general, a public key method is widely used, in which a public key is kept open to the public and a key for decryption is kept as a personal key.

Digital watermarking is a technique in which a certain operation is performed on original digital data, and information about the digital data is embedded in the digital data itself. By applying this technique, for example, when an illegal copy is found, it is also possible to specify who redistributed the illegal copy. Currently, as a method of realizing the digital watermarking technology, there are discrete cosine transform,
Methods using Fourier transform, wavelet transform and the like have been studied.

[0010]

However, even digital data processed using an encryption technique or a digital watermark technique can be illegally copied to another information recording medium. In order to prevent this, it is necessary to provide a special function for preventing unauthorized copying in an information recording apparatus for recording information on an information recording medium, an information reproducing apparatus, or an information recording / reproducing apparatus having both functions. It has not been realized.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an optical information recording medium, an information confidentiality holding method, and a system therefor that can prevent unauthorized use of recorded information.

[0012]

According to the present invention, in order to attain the above object, the present invention provides a digital data and, when an operation on the digital data is detected, interrupts the operation and prompts for a password. A first computer program for performing a process of continuing the interrupted operation when the input password is a legitimate password, and at least an information reproducing device that operates a computer program resident in a memory, An optical information recording medium in which a second computer program that automatically starts up and causes the first computer program to reside in the memory of the information reproducing apparatus is proposed.

When the optical information recording medium is loaded into an information reproducing apparatus in order to perform an operation such as reading information written in the optical information recording medium, the second computer program starts automatically. Causes the first computer program to reside in the memory of the information reproducing apparatus.
Accordingly, the first computer program operates in the information reproducing apparatus and monitors an operation from the information recording / reproducing apparatus on the digital data written on the optical information recording medium. This operation includes, for example, a copy operation of the digital data, a display operation when the digital data is character information or image information, an execution operation when the digital data is a computer program, and a voice operation when the digital data is a computer program. If the information is information, any of the reproduction operation and the like may be used. Further, when the first computer program operating in the information reproducing device detects an operation on the digital data from the information reproducing device, the first computer program interrupts the operation and prompts for the input of a password. When the password is an authorized password, a process for continuing the interrupted operation is performed. As a result, a person who does not know the formal password cannot operate the digital data in the optical information recording medium.

According to a second aspect of the present invention, there is provided the optical information recording medium according to the first aspect, wherein the digital data is digital data in which digital watermark data is embedded in basic data.

In the optical information recording medium, the digital data is data in which information different from the basic information is embedded as digital watermark data in basic data based on the basic information to be written. Accordingly, even if the digital data is operated by inputting the regular password, information different from the basic information can be obtained by extracting the digital watermark data from the digital data after the operation.

According to a third aspect of the present invention, in the optical information recording medium according to the first aspect, the digital data is digital data obtained by further encrypting data in which digital watermark data is embedded in basic data. Suggest a medium.

In the optical information recording medium, the digital data is obtained by embedding information different from the basic information as digital watermark data into basic data based on the basic information to be written, and further encrypting the digital data. Data. Thus, even if the digital data is manipulated by inputting a regular password, the basic information cannot be obtained unless the digital data can be decrypted.
Further, even if decoding is possible, information different from the basic information can be obtained by extracting the digital watermark data from the decoded digital data.

According to a fourth aspect of the present invention, in the optical information recording medium according to the first aspect, the digital data is digital data in which digital watermark data is embedded in basic data. An optical information recording medium including means for removing the digital watermark data from the digital data and extracting the basic data when the operation on the digital data is an operation for reading the basic data.

In the optical information recording medium, the digital data is data in which information different from the basic information is embedded as digital watermark data in basic data based on basic information to be written. Accordingly, even if the digital data is operated by inputting the regular password, information different from the basic information can be obtained by extracting the digital watermark data from the digital data after the operation. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

According to a fifth aspect of the present invention, in the optical information recording medium according to the first aspect, the digital data is digital data obtained by further encrypting data in which digital watermark data is embedded in basic data. One computer program includes means for extracting the basic data by decoding the digital data and removing the digital watermark data when the operation on the digital data is an operation of reading the basic data. An optical information recording medium is proposed.

In the optical information recording medium, the digital data is obtained by embedding information different from the basic information as digital watermark data into basic data based on basic information to be written, and further encrypting the digital data. Data. Thus, even if the digital data is manipulated by inputting a regular password, the basic information cannot be obtained unless the digital data can be decrypted.
Further, even if decoding is possible, information different from the basic information can be obtained by extracting the digital watermark data from the decoded digital data. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

According to a sixth aspect of the present invention, in the optical information recording medium according to the first aspect, the first computer program includes a copy operation of the digital data as one of operations on the digital data to be detected. We propose an optical information recording medium containing:

In the optical information recording medium, the digital data cannot be copied, that is, copied without inputting the formal password.

According to a seventh aspect of the present invention, there is provided an optical information recording medium according to the first aspect, which is a write-once optical information recording medium.

Since the optical information recording medium is of the write-once type, it is impossible to falsify the written information or computer program.

According to an eighth aspect of the present invention, in the optical information recording medium according to the first aspect, the digital data is such that digital watermark data is embedded in basic data, and a part of the digital watermark data is the regular password. Wherein the first computer program comprises: means for extracting the formal password from the digital watermark data; and means for comparing the extracted formal password with the inputted password. Are proposed.

In the optical information recording medium, since the electronic watermark data contains the legitimate password, it becomes difficult for a person who does not know the legitimate password to extract the legitimate password.

According to a ninth aspect of the present invention, the information is written from the optical information recording medium on which the information is written by using an information reproducing apparatus for writing information on the optical information recording medium and operating at least a computer program resident in the memory. An information confidentiality method when taking out and using, when writing the information to the optical information recording medium,
When detecting an operation on the digital data based on the information and the digital data, the operation is interrupted to prompt the input of a password, and the interrupted operation is continued when the input password is a legitimate password. A first computer program for performing a process for causing the information reproducing apparatus to automatically start up the first computer program when loading the information reproducing apparatus;
And a second computer program that causes the computer program to reside in the memory of the information reproducing apparatus.

According to the information security maintaining method, when the information is written to the optical information recording medium, digital data based on the information and the first and second computer programs are written. When the optical information recording medium is loaded into an information reproducing apparatus in order to perform an operation such as reading information written in the information recording medium,
The second computer program is automatically started and the first computer program is resident in the memory of the information reproducing apparatus. Accordingly, the first computer program operates in the information reproducing apparatus and monitors an operation from the information recording / reproducing apparatus on the digital data written on the optical information recording medium.
This operation includes, for example, a copy operation of the digital data, a display operation when the digital data is character information or image information, an execution operation when the digital data is a computer program, and a voice operation when the digital data is a computer program. If the information is information, any of the reproduction operation and the like may be used. Further, when the first computer program operating in the information reproducing apparatus detects an operation on the digital data from the information reproducing apparatus, the first computer program interrupts the operation and prompts for a password.
When the input password is a legitimate password, a process for continuing the interrupted operation is performed. As a result, a person who does not know the formal password cannot operate the digital data in the optical information recording medium.

According to a tenth aspect of the present invention, in the information confidentiality maintaining method according to the ninth aspect, when the information is written to the optical information recording medium, digital watermark data is applied to basic data obtained by converting the information into data. Embedded in the digital data to generate the digital data, and, when the operation on the digital data is an operation for reading the basic data, removing the digital watermark data from the digital data to generate the digital data. We propose an information confidentiality method that includes means for extracting data.

According to the information confidentiality maintaining method, data in which information different from the basic information is embedded as digital watermark data is used as the digital data for the basic data based on the basic information to be written. Written on the recording medium. Accordingly, even if the digital data is operated by inputting the regular password, information different from the basic information can be obtained by extracting the digital watermark data from the digital data after the operation. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

According to an eleventh aspect of the present invention, in the information confidentiality maintaining method according to the ninth aspect, when writing the information on the optical information recording medium, the basic data obtained by converting the information into digital watermark data is used. After generating the data in which is embedded, the digital data is further generated by encrypting the data, and the first computer program is read when the operation on the digital data is the reading operation of the basic data. An information security preserving method is proposed, which includes means for decoding the digital data, removing the digital watermark data, and extracting the basic data.

According to the information confidentiality maintaining method, information different from the basic information is embedded as digital watermark data in the basic data based on the basic information to be written, and the encrypted data is stored in the basic data. The data is written on the optical information recording medium as digital data. Thus, even if the digital data is manipulated by inputting a regular password, the basic information cannot be obtained unless the digital data can be decrypted. Further, even if decoding is possible, information different from the basic information can be obtained by extracting the digital watermark data from the decoded digital data. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

According to a twelfth aspect of the present invention, in the information confidentiality holding method according to the ninth aspect, the first computer program is used to copy the digital data as one of operations on the digital data to be detected. We propose an information confidentiality method to be included.

According to the method for maintaining information confidentiality, the digital data cannot be copied unless the formal password is input.

According to a thirteenth aspect of the present invention, there is provided the information security maintaining method according to the ninth aspect, wherein a write-once optical information recording medium is used as the optical information recording medium.

According to the method for keeping information confidential, the optical information recording medium is of the write-once type, so that it is impossible to falsify the written information or computer program.

According to a fourteenth aspect of the present invention, in the information confidentiality maintaining method according to the ninth aspect, when the information is written on the optical information recording medium, the normal data obtained by converting the information into the data is stored in the regular data. Generating the digital data by embedding digital watermark data including password data; executing the first computer program by extracting the formal password from the digital watermark data; And a means for comparing with a given password.

According to the information confidentiality maintaining method, since the digital watermark data contains the legitimate password, it becomes difficult for a person who does not know the legitimate password to extract the legitimate password.

According to a fifteenth aspect of the present invention, information is written on an optical information recording medium by using an information recording device, and the information is written by using an information reproducing device that operates at least a computer program resident in a memory. An information confidentiality protection system for taking out the information from a recording medium and using the information, wherein the information recording device interrupts the operation when detecting an operation on the digital data to be confidentiality, and prompts for a password. Means for holding a first computer program for performing a process of continuing the interrupted operation when the input password is a legitimate password, and automatically starting up when the information reproducing apparatus is loaded with the first computer program. A second computer program that causes a first computer program to reside in a memory of the information reproducing apparatus. Means for storing the information, and when writing the information to the optical information recording medium, the first computer program and the second computer program together with digital data based on the information are written to the optical information recording medium. An information security system with a means for writing is proposed.

According to the information security maintaining system, when the information recording apparatus writes the information on the optical information recording medium, the digital data based on the information and the first and second computer programs are written. Therefore, when the optical information recording medium is loaded into the information reproducing apparatus in order to perform an operation such as reading information written in the optical information recording medium, the second computer program starts automatically. Causes the first computer program to reside in the memory of the information reproducing apparatus. Accordingly, the first computer program operates in the information reproducing apparatus and monitors an operation from the information recording / reproducing apparatus on the digital data written on the optical information recording medium. This operation includes, for example, a copy operation of the digital data, a display operation when the digital data is character information or image information, an execution operation when the digital data is a computer program, and a voice operation when the digital data is a computer program. If the information is information, any of the reproduction operation and the like may be used. Further, when the first computer program operating in the information reproducing device detects an operation on the digital data from the information reproducing device, the first computer program interrupts the operation and prompts for the input of a password. When the password is an authorized password, a process for continuing the interrupted operation is performed. As a result, a person who does not know the formal password cannot operate the digital data in the optical information recording medium.

According to a sixteenth aspect of the present invention, in the information security maintaining system according to the fifteenth aspect, the first computer program stores the digital data when the operation on the digital data is an operation for reading the basic data. Means for extracting the basic data by removing the digital watermark data from the information recording device, wherein the information recording device writes the information to the optical information recording medium, An information security system comprising means for generating digital data by embedding digital watermark data in data is proposed.

According to the information confidentiality preservation system, data in which information different from the basic information is embedded as digital watermark data is added to the basic data based on the basic information to be written by the information recording device. The data is written on the optical information recording medium as digital data.
Thus, even if the digital data is operated by inputting the regular password in the information reproducing apparatus, information different from the basic information can be obtained by extracting the digital watermark data from the digital data after the operation. When the operation is a read operation of basic data,
By inputting the formal password, the basic data from which the digital watermark data has been removed can be extracted from the digital data.

According to a seventeenth aspect, in the information security maintaining system according to the fifteenth aspect, the first computer program stores the digital data when the operation on the digital data is an operation for reading the basic data. Means for extracting the basic data by removing the digital watermark data after decoding
The information recording apparatus, when writing the information on the optical information recording medium, means for generating data in which digital watermark data is embedded in basic data obtained by converting the information into data, Means for encrypting the embedded data to generate the digital data.

According to the information security system, information different from the basic information is embedded as digital watermark data in the basic data based on the basic information to be written in the information recording apparatus, and further encrypted. The written data is written to the optical information recording medium as the digital data. As a result, even if the digital data is manipulated by inputting a regular password in the information reproducing apparatus, the basic information cannot be obtained unless the digital data can be decrypted. Further, even if decoding is possible, information different from the basic information can be obtained by extracting the digital watermark data from the decoded digital data. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

According to a twelfth aspect of the present invention, in the information security maintaining system according to the fifteenth aspect, the first computer program stores the digital data when the operation on the digital data is an operation for reading the basic data. Means for operating an external program for decoding the digital data to obtain decoded digital data, and means for removing the digital watermark data from the decoded digital data and extracting the basic data, and The recording apparatus includes means for generating data in which digital watermark data is embedded in basic data obtained by converting the information into data when writing the information to the optical information recording medium; and Means for generating the digital data by encrypting the read data. Location proposes information confidentiality system comprising a computer program for decrypting the encrypted digital data as the external program.

According to the information security maintaining system, information different from the basic information is embedded as electronic watermark data in the basic data based on the basic information to be written in the information recording device, and further encrypted. The written data is written to the optical information recording medium as the digital data. As a result, even if the digital data is manipulated by inputting a regular password in the information reproducing apparatus, the basic information cannot be obtained unless the digital data can be decrypted. If the information reproducing apparatus does not have a computer program for decrypting the encrypted digital data, the encrypted digital data cannot be decrypted. Further, even if the encrypted data can be decrypted, information different from the basic information can be obtained by extracting the digital watermark data from the decrypted digital data. When the operation is a reading operation of the basic data, the basic data from which the digital watermark data has been removed can be extracted from the digital data by inputting the regular password.

The external program is a CD-ROM,
In the case of distribution together with data on a CD-R or the like, it is not necessary to consider compatibility when upgrading the version. In addition, an external program on the CD-ROM is stored in an OS (Operating
If it is started at the (System) level, it is possible to make copying of external programs difficult.

According to a nineteenth aspect of the present invention, in the information security maintaining system according to the fifteenth aspect, the first computer program performs a copy operation of the digital data as one of operations on the digital data to be detected. We propose an information security system that is included.

According to the information security system, the digital data cannot be copied unless the formal password is input.

According to a twentieth aspect of the present invention, there is provided the information security maintaining system according to the fifteenth aspect, wherein the optical information recording medium is a write-once optical information recording medium.

According to the information security maintaining system, since the optical information recording medium is of the write-once type, it is impossible to falsify the written information or computer program.

According to a twenty-first aspect of the present invention, in the information security maintaining system according to the fifteenth aspect, the first computer program comprises: means for extracting the formal password from the digital watermark data; And means for comparing the inputted password with the input password, wherein the information recording device writes the information to the optical information recording medium, In addition, the present invention proposes an information confidentiality maintaining system including means for generating the digital data by embedding digital watermark data including the data of the regular password.

According to the information confidentiality preservation system, the digital watermark data contains the legitimate password, and the first computer program extracts the legitimate password and uses it for comparison. It becomes difficult for a person who does not know the formal password to extract the formal password.

[0055]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view showing an information security maintaining system according to the first embodiment of the present invention, and FIG. 2 is a block diagram showing an electric circuit thereof. In FIG. 1, reference numeral 1 denotes an information security system, which is a personal computer main body 11, a monitor 12, a keyboard 13, a mouse 14, a CD-R writer 15, and a write-once write-once optical disc (hereinafter, referred to as a CD-R). CD-R) 1
6.

A personal computer main body (hereinafter, referred to as a computer main body) 11 includes a well-known CPU 21, a memory 22, a display control section 23, a hard disk drive 24,
Floppy disk drive 25 and CD drive 2
6 is provided.

The monitor 21 is connected to the CPU 21 via a display control unit 23, and a keyboard 13, a mouse 14, and a CD-R via an interface (not shown).
Lighter 15 is connected.

The CPU 21 reads a program stored in the hard disk drive 24 into the memory 22 or makes the program resident in the memory 22, and operates according to the program in the memory 22. Further, the CPU 21 controls the display control unit 2.
In addition to displaying information on the monitor 12 via the computer 3, data and instructions input via the keyboard 13 and the mouse 14 are read and executed. Further, C
The PU 21 accesses the data in the hard disk drive 24, and also accesses the floppy disk drive 25 and the CD.
Floppy disk or C loaded in drive unit
Access the data in D.

The hard disk drive 24 stores various application programs and data. The application programs according to the present invention include a digital watermark embedding module, a CD-R recording module, an automatic installation program, an operation control program, and a secret information writing module. Is stored.

Next, using the above system, the CD-R1
The operation for recording the confidential information and the operation of the CPU 21 will now be described.

When recording confidential information on the CD-R 16, the above-mentioned confidential information writing module is started.
After startup, the CPU 21 operates as shown in FIG. 3 according to the program of this module to perform information recording processing.

That is, when the confidential information writing module is started, the CPU 21 first displays a password setting screen and prompts the user to set a password (SA1). This password is arbitrarily set by the operator and is used when operating recorded information.

Next, the CPU 21 prompts the user to specify a file of the information to be recorded, and when the file is specified by the operator, activates the digital watermark embedding module to convert the digital data (basic data) of the specified file. On the other hand, digital data in which digital watermark data is embedded is generated (SA2). At this time, the password set in the process of SA1 is embedded as a regular password in a part of the digital watermark data. The digital watermark data other than the password can be set arbitrarily by activating the digital watermark embedding module.

After that, the CPU 21 activates the CD-R recording module, and installs the automatic installation program and the digital data with the digital watermark embedded therein on the CD-R 16 loaded in the CD-R writer 15. Write the operation control program to CD-R16.
Thereby, as shown in FIG. 4, a CD-ROM on which digital data 31 in which a digital watermark is embedded, an automatic installation program 32 and an operation control program 33 are recorded.
R16 is created, and the recording process of the confidential information ends.

The CD-ROM on which information is recorded by the above process
The digital data 31 in R16 can be operated only by a person who knows the above-mentioned regular password, and a person who does not know the password cannot perform any operation.

That is, the automatic installation program determines that the CD-R 16 on which the
It has a function of automatically starting up when loaded into the D drive device, and operating the operation control program resident in the memory of the information reproducing device.

Therefore, the CD-R 16 is stored in the C of the information reproducing apparatus.
When loaded into the D drive device, operation restriction control is performed by an operation control program.

For example, the CD-R 16 in which the above confidential information is recorded in the CD drive device 26 of the computer main body 11
Is loaded, the automatic installation program 32 is automatically started, and the operation control program 33 is resident in the memory 22 to be started.

When the operation control program starts operating in the memory of the information reproducing apparatus, the CPU 21 monitors the operation from the information recording / reproducing apparatus for digital data written on the CD loaded in the CD drive, and Restrict operations on data with embedded watermark data.

This operation includes, for example, a digital data copy operation, a display operation when the digital data is character information or image information, an execution operation when the digital data is a computer program, and a voice information as the digital data. If there is, such a reproduction operation is performed.

That is, as shown in FIG. 5, the CPU 21
The operation of the digital data 31 in the CD-R 16 is monitored (SB1, SB2), and the digital data 31 is monitored.
When an operation on is detected, this operation is interrupted and a password input screen is displayed (SB3).

Next, the CPU 21 extracts a formal password from the digital data 31 and determines whether the password input by the operator is a formal password (SB4).

If the result of this determination is that the input password does not match the formal password, the process is terminated without executing the interrupted operation (SB5), and the process proceeds to SB7 described later. When the input password matches the formal password, the CPU 21 executes the interrupted operation (SB6).

Next, the CPU 21 operates the CD drive 2
6 to determine whether the CD-R 16 has been removed (SB
7) If the CD-R 16 has not been taken out, the process proceeds to the above SB1 and the above-mentioned process is repeated. If the CD-R 16 has been taken out from the CD drive device 26, the above-mentioned process is terminated and the operation control program 33 Release from the memory 22.

Therefore, the digital data 31 written on the CD-R 16 can be operated only by those who know the password. A person who does not know the password cannot copy the data, display the data, execute the program, or reproduce the sound of the data. As a result, unauthorized use and tampering of the digital data 31 written on the CD-R 16 can be prevented.

In the present embodiment, the regular password is embedded in the digital data 31 as a part of the digital watermark data, but may be embedded in the operation control program 33. In addition, two different passwords may be embedded in each of the two passwords so as to regulate the passwords twice.

Next, a second embodiment of the present invention will be described.

In the second embodiment, in addition to the configuration of the first embodiment, a CD
When the digital data 16 in the R16 is read and used, the operation control program 33 is provided with a function of removing digital watermark data from the digital data 31 and transferring it to the application program.

That is, when the CD-R 16 on which the confidential information is recorded is loaded into the CD drive device 26 of the computer main body 11 and the operation control program 33 is started, as shown in FIG. The operation on the digital data 31 in R16 is monitored (SC1, SC
2) If an operation on the digital data 31 is detected, the operation is interrupted and a password input screen is displayed (SC3).

Next, the CPU 21 extracts the formal password from the digital data 31, and determines whether or not the password input by the operator is a formal password (SC4).

If the result of this determination is that the entered password does not match the formal password, the suspended operation is terminated without executing it (SC5), and the process proceeds to SC11 described later. When the input password matches the formal password, the CPU 21
It is determined whether the operation is a data read operation from another application program (SC6).

If the result of this determination is that the operation is not a data read operation from another application program, the above-mentioned interrupted operation is executed (SC7), and a later-described SC is executed.
Then, the process proceeds to step S11. If the operation is a data read operation from another application program, the CD
-Read digital data 31 from R16 (SC
8) Generate digital data obtained by removing digital watermark data from the digital data 31 (SC9), and deliver the digital data to the application program (SC10).

Next, the CPU 21 operates the CD drive 2
6 to determine whether the CD-R 16 has been removed (SC
11) If it is not ejected, the process proceeds to SC1 and repeats the above-mentioned process.
When the CD-R 16 is removed from the storage device, the above process is terminated and the operation control program 33 is released from the memory 22.

Thus, the other application program can use the digital data 31 with the digital watermark data removed. Therefore, for example, even when displaying image data using a visible digital watermark, the digital watermark is automatically removed and image data without a digital watermark can be displayed.

Next, a third embodiment of the present invention will be described.

In the third embodiment, in addition to the configuration of the second embodiment, the digital data 31 is encrypted when data is written to the CD-R 16. The cryptographic module for this is stored in the hard disk drive 24.

In the third embodiment, when the confidential information writing module is started to record the confidential information on the CD-R 16, as shown in FIG. 7, the CPU 21 first displays a password setting screen and displays the password setting screen. The setting is prompted (SD1). This password is arbitrarily set by the operator as described above, and is used when operating the recorded information.

Next, the CPU 21 prompts the user to specify a file of information to be recorded. When the file is specified by the operator, the digital watermark embedding module is activated to convert the digital data (basic data) of the specified file. On the other hand, digital data in which digital watermark data is embedded is generated (SD2). Further, the CPU 21
An operation control program 33 in which the password set in the process of SD1 is embedded as a regular password is generated in the operation control program.

Thereafter, the CPU 21 activates the cryptographic module, generates digital data obtained by encrypting the digital data in which the digital watermark data is embedded (SD3), and generates the digital data 31.

Next, the CD-R recording module is started, and the CD-R 1 loaded in the CD-R writer 15 is loaded.
For 6, the automatic installation program 32 and the operation control program 33 in which the formal password is embedded are written in the CD-R 16 together with the digital data 31 in which the digital watermark is embedded and further encrypted.

Thus, the recording process of the confidential information is completed.

On the other hand, the CD drive of the information reproducing apparatus is, for example,
6, when the CD-R 16 on which the confidential information is recorded is loaded and the operation control program 33 is started, the CPU 21
Operates as follows to regulate the operation of the digital data 31.

That is, as shown in FIG.
The operation on the digital data 31 in the CD-R 16 is monitored (SE1, SE2), and the digital data 31 is monitored.
When an operation for is detected, this operation is interrupted and a password input screen is displayed (SE3).

Next, the CPU 21 extracts a formal password from the digital data 31 and determines whether or not the password input by the operator is a formal password (SE4).

If the result of this determination is that the entered password does not match the formal password, the suspended operation is terminated without executing it (SE5), and the process proceeds to SC11 described later. When the input password matches the formal password, the CPU 21
It is determined whether the operation is a data read operation from another application program (SE6).

If the result of this determination is that the operation is not a data read operation from another application program, the above interrupted operation is executed (SE7), and SE (described later) is executed.
The process proceeds to step 12. If the operation is a data read operation from another application program, the CD
-Read digital data 31 from R16 (SE
8) Activate the cryptographic module to perform decryption (SE)
9).

In this decryption process, since a key (common key or public key) is required, a person who does not have a key cannot decrypt it.

Next, the CPU 21 releases the decrypted cryptographic module and outputs the decrypted digital data 31.
Then, digital data from which digital watermark data has been removed is generated (SE10), and the digital data is transferred to the application program (SE11).

Next, the CPU 21 operates the CD drive 2
6 to determine whether the CD-R 16 has been removed (SE
12) If not ejected, the process proceeds to SE1 and repeats the above-mentioned processing.
When the CD-R 16 is removed from the storage device, the above process is terminated and the operation control program 33 is released from the memory 22.

By encrypting data in this manner, the confidentiality maintaining function can be further improved.

The first to third embodiments are specific examples of the present invention, and the present invention is not limited to only these examples.

In each of the above embodiments, the confidential information is
The case of writing and storing in the DR 16 has been described. However, the present invention is not limited to this, and any information or the like that is desired to be prevented from being illegally used by a third party can be similarly implemented and achieve the same effects.

In each of the above embodiments, the CD-R16 is used as the information recording medium, but the present invention is not limited to this. However, the use of a write-once write-once CD-R increases the effect of preventing data falsification.

In each of the above embodiments, the operation restriction control is performed on the digital data in which the digital watermark data is embedded. However, the operation control program includes the digital data in which the digital watermark data is not embedded.
The operation of all data and programs written on the CD-R 16 may be restricted.

Further, in each of the above-described embodiments, an example has been described in which data operation is performed on the CD-R 16 on which information has been written using the information security maintaining system 1 on which information has been written. It goes without saying that the same effect can be obtained by using a device or the like.

[0107]

As described above, according to the optical information recording medium of the first to eighth aspects of the present invention, a person who does not know the password can operate on the written digital data. Since the digital data cannot be used, illegal use and tampering of the digital data can be prevented.

Further, according to the information confidentiality storage method according to the ninth to fourteenth aspects, when manipulating the information in the optical information recording medium on which the information is written by the method, a person who does not know the password, Since the operation on the written digital data cannot be performed, the digital data can be prevented from being illegally used or falsified.

According to the information confidentiality storage system of the present invention, when operating information in an optical information recording medium on which information has been written using the information recording device of the system, a password is required. Can not operate on the written digital data, so that unauthorized use or tampering of the digital data can be prevented.

[Brief description of the drawings]

FIG. 1 is an external view showing an information security system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit of the information security system according to the first embodiment of the present invention;

FIG. 3 is a flowchart illustrating confidential information writing processing according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a CD-R on which confidential information is written according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation control operation according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating an operation control operation according to the second embodiment of the present invention.

FIG. 7 is a flowchart illustrating confidential information writing processing according to a third embodiment of the present invention.

FIG. 8 is a flowchart illustrating an operation control operation according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Information security system, 11 ... Personal computer main body, 12 ... Monitor, 13 ... Keyboard, 14 ...
Mouse, 15 CD-R writer, 16 CD-R, 2
DESCRIPTION OF SYMBOLS 1 ... CPU, 22 ... Memory, 23 ... Display control part, 24 ...
Hard disk drive, 25 ... Floppy disk drive,
26: CD drive device, 31: Digital data, 3
2 ... Automatic installation program, 33 ... Operation control program

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5B017 AA06 BA05 BA07 BB02 CA09 CA16 5D044 BC05 CC04 DE47 DE49 DE57 GK12 GK17 5J104 AA01 AA07 AA14 KA01 NA05 NA32 PA14 9A001 EE03 LL03

Claims (21)

[Claims] When an operation on digital data is detected, the operation is interrupted to prompt the input of a password, and when the input password is a valid password, the interrupted operation is performed. A first computer program for performing a process to be continued, and automatically loading the first computer program into a memory of the information reproducing apparatus when the information reproducing apparatus operates at least a computer program resident in a memory. An optical information recording medium, wherein a resident second computer program is recorded. 2. The optical information recording medium according to claim 1, wherein the digital data is digital data in which digital watermark data is embedded in basic data. 3. The optical information recording medium according to claim 1, wherein the digital data is digital data obtained by further encrypting data in which digital watermark data is embedded in basic data. 4. The digital data is digital data in which digital watermark data is embedded in basic data. In the first computer program, an operation on the digital data is an operation of reading the basic data. 2. The optical information recording medium according to claim 1, further comprising means for removing said digital watermark data from said digital data and extracting said basic data. 5. The digital data is digital data obtained by further encrypting data obtained by embedding digital watermark data in basic data, wherein the first computer program is configured so that an operation on the digital data is performed on the basic data. 2. The optical information recording medium according to claim 1, further comprising means for extracting the basic data by removing the digital watermark data after decoding the digital data when the reading operation is performed. 6. The first computer program,
2. The optical information recording medium according to claim 1, wherein one of operations on the digital data to be detected includes an operation of copying the digital data. 7. The optical information recording medium according to claim 1, wherein the optical information recording medium is a write-once optical information recording medium. 8. The first computer program, wherein the digital data is digital data in which digital watermark data is embedded in basic data and a part of the digital watermark data includes the regular password. 2. The light according to claim 1, further comprising means for extracting the regular password from the digital watermark data, and means for comparing the extracted regular password with the input password. Information recording medium. 9. When information is written on an optical information recording medium and the information is taken out from the optical information recording medium on which the information is written using an information reproducing apparatus that operates at least a computer program resident in a memory, and used. An information confidentiality maintaining method, comprising: writing the information to the optical information recording medium; digital data based on the information; interrupting the operation when detecting an operation on the digital data; A first computer program for prompting the input and for continuing the interrupted operation when the input password is a legitimate password, and automatically starting up when the information reproducing apparatus is loaded. A second computer program that makes the first computer program resident in the memory of the information reproducing apparatus. Information confidentiality method characterized by writing grams on the optical information recording medium. 10. When the information is written to the optical information recording medium, the digital data is generated by embedding digital watermark data into basic data obtained by converting the information into data. Wherein when the operation on the digital data is a read operation of the basic data, the digital data includes means for removing the digital watermark data from the digital data and extracting the basic data. Item 9. An information confidentiality method according to Item 9. 11. When writing the information on the optical information recording medium, after generating data in which digital watermark data is embedded in basic data obtained by converting the information into data, the data is further encrypted. Generating the digital data, and executing the first computer program by decoding the digital data and removing the digital watermark data when the operation on the digital data is a reading operation of the basic data. 10. The method according to claim 9, further comprising means for extracting basic data. 12. One of operations on the digital data for which the first computer program is to be detected.
10. The method according to claim 9, further comprising a copying operation of the digital data. 13. A method according to claim 9, wherein a write-once optical information recording medium is used as said optical information recording medium. 14. When the information is written on the optical information recording medium, the digital data is generated by embedding digital watermark data including the data of the regular password into basic data obtained by converting the information into data. The first computer program includes means for extracting the formal password from the digital watermark data, and means for comparing the extracted formal password with the input password. 10. The method for maintaining information confidentiality according to claim 9, wherein: 15. An optical information recording medium, wherein information is written on an optical information recording medium using an information recording device, and the information is written from an optical information recording medium, on which the information is written, using an information reproducing device operating at least a computer program resident in a memory. An information confidentiality preservation system that takes out and uses the information recording device. Means for holding a first computer program for performing a process of continuing the interrupted operation when the password is a legitimate password; and a first computer program which is automatically activated when the information reproducing apparatus is loaded. Holding a second computer program for causing a computer to reside in the memory of the information reproducing apparatus And when writing the information on the optical information recording medium, the first information together with digital data based on the information.
An information security maintaining system comprising means for writing the computer program of (1) and the second computer program to the optical information recording medium. 16. The first computer program further comprises means for removing the digital watermark data from the digital data and extracting the basic data when the operation on the digital data is a read operation of the basic data. The information recording apparatus generates the digital data by embedding digital watermark data into basic data obtained by converting the information into data when writing the information to the optical information recording medium. 16. The information security system according to claim 15, further comprising means. 17. The method according to claim 17, wherein, when the operation on the digital data is an operation of reading out the basic data, the first computer program decodes the digital data and then removes the digital watermark data to remove the basic data. The information recording device, when writing the information on the optical information recording medium, the data obtained by embedding the digital watermark data in the basic data obtained by converting the information into data 16. The information security maintaining system according to claim 15, further comprising: means for generating; and means for generating the digital data by encrypting the data in which the digital watermark data is embedded. 18. The first computer program obtains decoded digital data by operating an external program that decodes the digital data when the operation on the digital data is an operation of reading the basic data. Means for removing the digital watermark data from the decoded digital data and extracting the basic data, wherein the information recording device writes the information to the optical information recording medium. And means for generating data in which digital watermark data is embedded in the basic data obtained by converting the information into data, and means for generating the digital data by encrypting the data in which the digital watermark data is embedded. A computer for decrypting the encrypted digital data; Information confidentiality system of claim 15, wherein that it comprises a program as the external program. 19. The method according to claim 19, wherein the first computer program performs one of operations on the digital data to be detected.
16. The information security maintaining system according to claim 15, wherein the system includes a copying operation of the digital data. 20. The information security maintaining system according to claim 15, wherein said optical information recording medium is a write-once optical information recording medium. 21. The first computer program including means for extracting the regular password from the digital watermark data, and means for comparing the extracted regular password with the inputted password. The information recording device, when writing the information to the optical information recording medium, embedding digital watermark data including the data of the formal password in the basic data obtained by converting the information into data, 16. The information security system according to claim 15, further comprising means for generating digital data.