JP2003037590A - Information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information processor with an encryption device, which can improve protection of the copyright to the received data and can deal with the life of a recording medium suitably. SOLUTION: This processor is provided with a copyright protection identification part 4 to identify whether the received data is the data protected by the copyright or not and a reliability decision part 8 to decide the reliability of a recording medium 2. A encryption key is formed in the encryption key formation part 6 based on the prescribed information of the recording medium 2 in the case the reliability of the recording medium 2 is high in the reliability decision part 8 when the data identified that it is protected by the copyright in the copyright protection identification part 4 is enciphered. On the other hand, when it is determined that the reliability of the recording medium 2 is low, the encryption key is formed based on the prescribed information of the information processor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus equipped with an encryption device capable of strengthening the copyright protection of received data.

[0002]

2. Description of the Related Art In recent years, with the generalization of data communication,
Portable information terminal devices having a communication function have become widespread. These portable information terminal devices are provided with a recording medium for storing the received data, and this recording medium is composed of, for example, a rewritable memory card that can be attached to and detached from the portable information terminal device. ing. Further, these portable information terminal devices employ a technique of encrypting received data when storing it in a recording medium such as a memory card, so that the contents of the received data cannot be easily read by others. Has become.

For example, in Japanese Unexamined Patent Publication No. 9-146457, first identification information is generated by encrypting unique identification information of an information recording medium with an arbitrary authentication number, and the first information is recorded on the information recording medium. The second information is generated by encrypting the predetermined information of the system to be handled, a part of the second information is selected to generate the third information, and the third information is transferred to the information recording medium. A technique is disclosed in which encryption is performed using unique information of a device for reading and writing, and an encryption key for accessing information recorded on an information recording medium is generated.

Further, Japanese Patent Laid-Open No. 2000-187935 has a communication means for receiving digital data encrypted by the communication means, and the encryption means for encrypting the data is a recording medium. A first encryption unit for encrypting data with an encryption key generated based on the identification information of the recording medium and an encryption key generated based on the identification information of the reproduction device that handles the recording medium. When it is determined that the recording medium is removable from the reproducing apparatus, the first encrypting section encrypts the data, and the recording medium is removable from the reproducing apparatus. A technique is disclosed in which, when it is determined that the data cannot be encrypted, the second encryption unit encrypts the data.

Further, in Japanese Patent Laid-Open No. 7-287655,
The unique information of the device is written in the recording medium, and when this recording medium is installed in the device, the unique information of the device and the unique information already recorded on the recording medium are read and compared, and the unique information does not match. If this is the case, technology that prohibits access is disclosed. In this technique, the unique information is encrypted when the unique information is recorded on the recording medium.

Further, in Japanese Patent Laid-Open No. 2000-113586, based on a key encrypted by unique information held by a recording medium, identification information unique to each information, and information encrypted by the key. A technique is disclosed in which an encrypted key is specified by identification information unique to information, and the encrypted information is decrypted and reproduced.

[0007]

In the above-mentioned conventional technique, the encryption key generated by various encryption key generation methods is used to enhance the security of the information recorded on the recording medium, and A method of controlling the encryption key generation method when it is detachable is adopted. That is, as the importance of data confidentiality increases, the generation and control of the encryption key related to its security will become more sophisticated. Furthermore, since a recording medium for recording data has a physical (electrical) life, it is important to copy the data and back it up.

However, in the above-mentioned conventional technique,
For a removable recording medium, a method of controlling an encryption key based on the identification information of the recording medium is adopted. For this reason, when the data of the recording medium is copied to a new recording medium, the original information of the original recording medium and the unique information of the new recording medium are different, so that copying is possible but reproduction cannot be performed. There was a problem.

Further, although the method of writing the unique information of the information processing apparatus to the recording medium can solve the above-mentioned problem, there is a problem in that the copyright of the data may be ignored and copying may be performed. It was That is, if you have some knowledge of data encryption,
When the encrypted data recorded on the recording medium is decrypted, reproduced, and then saved, the data can be saved to a new recording medium to make a copy ignoring the copyright. There were times when it ended up.

In addition, in the method of generating the encryption key based on the unique information of the recording medium, the data recorded on the recording medium is recorded according to the life of the recording medium itself or the life of the operating environment (increased error rate). I could not make a copy.
That is, in the conventional technique, there is no means for the user to know the life of the recording medium, so that it is often the case that some users think that the data of the recording medium can be permanently used.

In addition, in the method in which the unique information of the device and the unique information already recorded on the recording medium are read out and compared, and if the unique information does not match, the access is prohibited, the information recorded in the recording medium is used. Since the information itself can be easily read, it can be copied to another recording medium, and the copyright cannot be protected. Further, if the device becomes unusable due to a failure or the like, even if another device tries to read the information recorded up to that point, the unique information of the device written in the recording medium will be different and the reading will not be successful. It was possible.

Further, based on the key encrypted by the unique information held by the recording medium, the identification information unique to each information, and the information encrypted by the key, the encrypted key is unique to the information. In the method of specifying the identification information of and reproducing the encrypted information in a composite manner, if the identification information peculiar to each information is used, each information can be copied without limitation,
The copyright holder's desired number of copies is no longer valid, and as a result, copyright protection cannot be achieved.

The present invention has been proposed in view of the above-mentioned circumstances, and it is possible to enhance the protection of the copyright of received data and to appropriately deal with the life of the recording medium. An object is to provide an information processing device including a possible encryption device.

[0014]

An information processing apparatus according to the present invention includes a receiving means for receiving data, an encrypting means for encrypting received data received by the receiving means, and the encrypting means. An information processing apparatus capable of copying the received data recorded on the recording medium onto a new recording medium, the receiving data being recorded on the exchangeable recording medium. Is provided with copyright protection identification means for identifying whether or not the data is protected by copyright, and reliability determination means for determining the reliability of the recording medium. In the case where the data identified as protected by the copyright is encrypted by the encryption means, the reliability determination means determines that the recording medium has high reliability. If it is determined that the encryption key is generated and encrypted based on the unique information of the recording medium and the reliability of the recording medium is determined to be low by the reliability determination means, The copyright is protected by generating an encryption key based on the unique information of the information processing apparatus and performing encryption.

Further, the information processing apparatus can be provided with an encryption key identifying means for identifying the type of encryption key used for the data recorded on the recording medium.

Further, in the information processing apparatus, when the data is encrypted and recorded in the recording medium, it is possible not to mix the types of the encryption keys in the recording medium.

Further, the information processing apparatus according to the present invention is for identifying receiving means for receiving data and for identifying whether or not the received data received by the receiving means is copyright protected data. Copyright protection identification means, copyright information management means for detecting copyright information from the received data and generating copyright management information, encryption means for encrypting the received data, and the encryption An information processing apparatus capable of copying the received data recorded on the recording medium onto a new recording medium, the storage device storing the received data encrypted by the encrypting means on an exchangeable recording medium. Cryptographic key generating means for generating an encryption key based on the unique information of the information processing device, the copyright information of the received data, and the copyright management information generated by the copyright information management means. Providing the received data with the encryption key created by the encryption key creating means to generate encrypted received data, and recording the encrypted received data in the recording medium. It is a feature.

In the information processing device, the encrypted received data and an encryption key for decrypting the encrypted received data are transmitted within a range permitted by the copyright information of the received data, It can be copied to a new recording medium.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an information processing apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an information processing device according to an embodiment of the present invention. As shown in FIG. 1, an information processing apparatus 1 according to an embodiment of the present invention records data on an exchangeable recording medium 2 and records the data recorded on the recording medium 2 as a novel recording medium. It is a device that can be copied to.

The information processing apparatus 1 includes a communication function unit 3 for transmitting and receiving data, and a copyright protection identifying unit 4 for identifying whether or not the received data is copyright protected data.
A data encryption unit 5 for encrypting data, an encryption key generation unit 6 for generating an encryption key used when encrypting data, and unique information of the recording medium 2 or the information processing device 1. A unique information acquisition / output unit 7 for acquiring and outputting, a reliability determination unit 8 for determining the reliability of the recording medium 2, and an encryption used for the data recorded on the recording medium 2. An encryption key identification determination unit 9 for identifying the type of key, an encrypted data decryption unit 10 for decrypting the data recorded on the recording medium 2, and a display for outputting the decrypted data to the outside. An external output interface section 11 is provided. Further, the recording medium 2 is provided with an encryption key recognizing means 12 for recognizing an encryption key used for the recorded data.

In the information processing apparatus 1, the data received by the communication function unit 3 is identified by the copyright protection identifying unit 4 as to whether or not it is a copyrighted work. In the information processing device 1 according to the present embodiment, the type of data (D
The copyright protection is identified based on the standard established for each VD or DVC. Note that the information processing apparatus 1 according to the present embodiment is premised on not specifying the encryption (key) of a copyrighted work that is not protected. Only encryption will be described.

Next, the operation of the information processing apparatus 1 according to this embodiment will be described based on the flowchart shown in FIG. In the information processing apparatus 1 according to the present embodiment, the communication function unit 3 receives data via the communication network, and the copyright protection identification unit 4 identifies whether or not the data is copyright protected. . If the data is copyright protected, as shown in FIG. 2, the encryption key identification determination unit 9 determines the presence / absence of an encryption key recorded on the exchangeable recording medium 2. (S0a).

Here, when there is no encryption key, the reliability determination unit 8 collects the data regarding the reliability read from the recording medium 2 and determines the reliability (S0b). On the other hand, if there is an encryption key, it is determined whether or not the encryption key is the unique information of the recording medium 2 (S1), and if it is the unique information of the recording medium 2, the reliability determination unit 8 records it. Medium 2
The data regarding the reliability read out from is collected and the reliability is determined (S0b).

The data regarding the reliability depends on the type of the recording medium 2, but for example, the number of times the recording medium 2 is accessed is written in the initial information area. Then, the reliability is determined by reading the accumulated access count information and comparing it with a specified value of the access count preset in the ROM or the like of the information processing apparatus 1. Further, for example, at a predetermined timing, the reliability measurement signal is recorded in a specific vacant area of the recording medium 2, the reliability measurement signal is reproduced, and the error value at the time of reproduction and the information processing apparatus 1 are stored in advance. RO
There is a method of determining the reliability by comparing the error value set in M. EEPROM as the recording medium 2
When used, the rewriting life is said to be several hundred thousand times.

When it is determined in the reliability determination process (S0b) that the reliability of the recording medium 2 is equal to or higher than the set value (high reliability), the unique information acquisition / output unit 7
The unique information of the recording medium 2 is acquired (S2). Further, when it is determined that the reliability of the recording medium 2 is less than or equal to the set value (the reliability is low), and when it is determined that the encryption key determination process (S1) is not the unique information of the recording medium 2, The unique information acquisition / output unit 7 acquires the unique information of the information processing device 1 (S3).

The unique information of the recording medium 2 is information different for each recording medium 2 (for example, serial numbers such as serial numbers).
That is, the unique information of the information processing device 1 is information different for each information processing device 1 (for example, a manufacturing number stored in a ROM, an identification number assigned to each CPU, etc.). In addition, the unique information of the recording medium 2 is previously stored in the recording medium 2.
It is assumed that the unique information of the information processing apparatus 1 is stored in advance in the ROM in the information processing apparatus 1.

The encryption key generation unit 6 generates an encryption key based on each unique information acquired by the unique information acquisition / output unit 7 (S4, S5). Then, the data encryption unit 5 encrypts the received data based on the encryption key generated by the encryption key generation unit 6 (S6). The encrypted data is recorded and stored in the recording medium 2, and at the same time, whether the encrypted key is generated by the encryption key recognizing means 12 based on the unique information of the recording medium 2 (S7) or the unique information of the information processing apparatus 1. It is determined whether or not the encryption key is generated based on (S8).

The method of recognizing the encryption key by the encryption key recognizing means 12 is such that any one of the above encryption keys is recorded as data on the recording medium 2.
It is possible to use a method of recording in association with. It is also possible to use a method in which any one of the above-mentioned encryption keys is printed or marked with unevenness so that the recording medium 2 can be physically recognized.

When the recording medium 2 on which data has already been recorded by using the information processing apparatus 1 is attached to the information processing apparatus 1, the encryption key recognizing means 12 of the recording medium 2 is used.
Since the encryption key can be determined in step 1, if the encryption key determined in step 1 (S1) is the encryption key generated based on the unique information of the information processing device 1, the information processing device 1
The received data is encrypted by the encryption key generated based on the unique information of. In this way, the determination by the encryption key recognizing means 12 (S1) is performed to determine the reliability of the recording medium 2 (S0).
By giving priority over b), it is possible to prevent the mixture of encryption key systems for the recording medium 2.

If the encryption key determined in step 1 (S1) is the encryption key generated based on the unique information of the recording medium 2, the reliability of the recording medium 2 is determined (S0b). Then, when it is determined that the reliability is low,
The recording medium 2 is replaced, and a warning is issued to record data on the new recording medium 2. Here, the user refuses to replace the recording medium 2 (the recording medium 2 that remains unreliable).
When the data is added in step 1), the data is encrypted by the encryption key generated based on the unique information of the recording medium 2.

Further, the reliability judgment processing of the recording medium 2 (S0
In b), the upper limit of the number of times when the encryption key is generated based on the unique information of the information processing device 1 may be limited by designating the number of times of copying in the copyright protection data of the received data.

The encrypted data stored in the recording medium 2 is
The encryption key is recognized by the encryption key recognizing means 12 of the recording medium 2, and the encryption key identification determination unit 9 determines the type of the encryption key to obtain the encryption key. Then, by the encrypted data decryption unit 10,
Data is decrypted based on the encryption key and the encrypted data recorded on the recording medium 2. The decoded data is input to the display / external output interface unit 11 and can be used for each purpose.

Next, another embodiment of the information processing apparatus according to the present invention will be described.

FIG. 3 is a block diagram showing a schematic configuration of an information processing apparatus according to another embodiment of the present invention. An information processing apparatus 21 according to another embodiment of the present invention, as shown in FIG. 3, has a communication function unit 23 for transmitting and receiving data.
A copyright protection identification unit 24 for identifying whether the received data is copyright protection data, a data encryption unit 25 for encrypting the data, and an encryption key used for encrypting the data. A cryptographic key A generation unit 26 and a cryptographic key B generation unit 27 for generating the unique information, and a unique information acquisition / output unit 28 for acquiring and outputting the unique information of the information processing device 21.
A copyright information management unit 29 for managing copyright information obtained from the received data, and an encrypted data decryption unit 30 for decrypting the data recorded on the recording medium 22.
And a display / external output interface unit 31 for outputting the decrypted data to the outside. Also,
A key information management unit 32 for managing the encryption key information used for the recorded data is added to the recording medium 22. The unique information of the information processing device 21 is information different for each information processing device 21, for example, a manufacturing number stored in the ROM.

In the information processing device 21, the data received by the communication function unit 23 is identified by the copyright protection identifying unit 24 as to whether or not the data is subject to copyright protection. In the information processing device 21 according to the present embodiment, the type of data (D
VD, DVC, etc.)
Identify copyright protection.

Next, the operation of the information processing apparatus 21 according to the present embodiment will be described based on the flowchart shown in FIG. In the information processing apparatus 21 according to the present embodiment, the communication function unit 23 receives data via the communication network, and the copyright protection identification unit 24 identifies whether or not the data is copyright protection target data. Then, in the case of copyright protected data, as shown in FIG. 4, information about whether or not copying of the data is permitted is acquired from the copyright holder and the content of the limitation is judged (S11).

If the duplication of the data is not permitted, the duplication permission count and the duplication permission count remaining count are both set to zero (S12), and the duplication is prohibited (S12). Then, while obtaining the copy permission number (S13) and the copy permission remaining number (S14), the encryption key A generation unit 2 is based on the obtained copy permission number and the copy permission remaining number.
The encryption key A is generated by 6 (S15). Therefore,
The encryption key A will include copy restriction information based on the copyright information.

The device unique information is acquired from the unique information acquisition / output unit 28 (S16), and the encryption key B generation unit 27 generates the encryption key B based on the device unique information and the number of times copying is permitted (S17). ). Therefore, the encryption key B includes the device unique information and the copy permission / prohibition information. Then, the data encryption unit 25 encrypts the received data based on the generated encryption key A and encryption key B (S18). The encrypted data is recorded on the recording medium 2
The information of the encryption key A and the encryption key B, which are stored in No. 2 (S19) and used for encryption, are managed by the key information management unit 32.

The encrypted data recorded on the recording medium 22 is recorded by the encrypted data decrypting unit 30 on the basis of the information managed by the key information managing unit 32, and each encryption key and the recording medium 22.
The data is decrypted from the encrypted data recorded in (1) and is sent to the display / external output interface unit 31 for display or output.

[0040]

According to the information processing apparatus of the present invention, the reliability of the recording medium on which the data protected by the copyright is recorded is determined, and when the reliability of the recording medium is high, the reliability of the recording medium is determined. The encryption key is generated based on the unique information, and when the reliability of the recording medium becomes low, the encryption key is generated based on the unique information of the information processing device. Therefore, when the reliability of the recording medium becomes low, it becomes possible to replace the recording medium with a new recording medium and perform copying, and there is no risk of losing important data.

Further, when the encryption key is generated from the copy data copied to the new recording medium, the reliability of this new recording medium is determined (the reliability is naturally high). An encryption key is generated based on the unique information of the and the copyright is protected.

Further, according to the information processing apparatus of the present invention, since the encryption key system of the data recorded on the recording medium can be identified, the user can judge the type of the encryption key and process the information. The information processing device does not have to input the device, and the information processing device automatically recognizes the type of the encryption key.

Further, according to the information processing apparatus of the present invention, since the types of encryption keys do not coexist in the data recorded in the recording medium, the data management becomes easy.

Further, according to the information processing apparatus of the present invention, the encryption key is based on the unique information of the information processing apparatus, the copyright information of the received data, and the copyright management information generated by the copyright information management means. Is generated. Therefore, when an attempt is made to copy the encrypted data that is subject to copyright protection in order to generate the encryption key, it becomes possible to perform copy management based on the copy restriction information and the copy permission / prohibition information held by the encryption key.
Furthermore, since the encryption key holds device-specific information, even if the user wants to move data to another information processing device, if the copyright holder permits the action, It is possible to make a temporary copy without referring to the device-specific information.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an information processing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the information processing apparatus according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of an information processing apparatus according to another embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the information processing apparatus according to another embodiment of the present invention.

[Explanation of symbols]

1, 21 Information processing device 2.22 recording medium 3, 23 Communication function section 4, 24 Copyright protection identification section 5, 25 Data encryption part 6 Cryptographic key generator 7 Unique information acquisition / output section 8 Reliability determination unit 9 Cryptographic key identification determination unit 10, 30 Encrypted data decryption unit 11, 31 Display / external output interface section 12 Cryptographic key recognition means 26 Encryption Key A Generation Unit 27 Encryption Key B Generation Unit 28 Unique information acquisition / output section 29 Copyright Information Management Department 32 Key Information Management Department

Claims (5)

[Claims] 1. A receiving means for receiving data, an encrypting means for encrypting the received data received by the receiving means, and a recording medium capable of exchanging the received data encrypted by the encrypting means. An information processing apparatus capable of copying the received data recorded on the recording medium to a new recording medium, the storage device storing the recorded data on the recording medium, and whether or not the received data is data protected by copyright. A copyright protection identifying means for identifying the data, and a reliability determining means for determining the reliability of the recording medium, and the data identified by the copyright protection identifying means as protected by copyright. On the other hand, when performing the encryption by the encryption unit, if the reliability determination unit determines that the reliability of the recording medium is high, the unique information of the recording medium is An encryption key is generated based on the encryption key, and when the reliability determination unit determines that the reliability of the recording medium is low, the encryption key is generated based on the unique information of the information processing apparatus. By doing the encryption,
An information processing device characterized by copyright protection. 2. The information processing apparatus according to claim 1, further comprising encryption key identifying means for identifying the type of encryption key used for the data recorded on the recording medium. 3. The information processing apparatus according to claim 1, wherein when the data is encrypted and recorded in the recording medium, the types of the encryption keys are not mixed in the recording medium. 4. Receiving means for receiving data, copyright protection identifying means for identifying whether or not the received data received by the receiving means is data protected by copyright, and the receiving means. Copyright information management means for detecting copyright information from data to generate copyright management information; encryption means for encrypting the received data;
An information processing apparatus, comprising: a storage unit for recording the received data encrypted by the encryption unit on an exchangeable recording medium, and copying the received data recorded on the recording medium to a new recording medium. An encryption key generating unit for generating an encryption key based on the unique information of the information processing device, the copyright information of the received data, and the copyright management information generated by the copyright information management unit, Characterized in that the received data is encrypted using the encryption key created by the encryption key creating means to generate encrypted received data, and the encrypted received data is recorded in the recording medium. Information processing device. 5. Within the range permitted by the copyright information of the received data, the encrypted received data and an encryption key for decrypting the encrypted received data are transmitted and copied to a new recording medium. The information processing apparatus according to claim 4, wherein the information processing apparatus is enabled.