The present invention relates to a right information encryption module, nonvolatile memory device, and right information recording system for safely recording: a use condition for encrypted contents; and right information including a key, and relates to a right information decryption module, nonvolatile memory device, right information reading system, and right information recording/reading system for reading the right information related to the encrypted contents for the purpose of decrypting and using the encrypted contents.
A network contents distribution service is widely spread; a contents distribution company distributes to a user terminal a pay electronic content (hereinafter simply referred to as a content) such as a piece of music, a movie, and a book to which a use restriction is imposed by a content holder in the service distributes. Since being the electronic information, the content can be easily copied, and thus the copyright of the content may be infringed because of the illegal copy. Accordingly, in order to prevent the illegal copy of the content, the contents distribution company usually encrypts the content and distributes the encrypted content to the user terminal. Generally, the distributed content is firstly recorded in a recording medium and then is watched by a plurality of the user terminals.
The contents distribution company creates a key used for encrypting the content as a part of contents right information (hereinafter simply referred to as right information), and distributes the key to the user terminal in addition to the content. In these years, the contents distribution company adds the reproduction management number of times and the reproduction management term to the right information in order to provide a flexible service. Thus, a data amount of the right information tends to increase.
Regarding the right information, it needs to prevent an act disadvantageous for the content holder such as the purposely-falsifying of the reproduction management number of times and the reproduction management term information by an ordinary user. Accordingly, a conventional method employs a technique for preparing in a nonvolatile memory device a secret region where the ordinary user cannot directly read and write data separately from a user region where the ordinary user can directly read and write data and recording the right information in the secret region.
In the network contents distribution server 730, a contents encryption part 731 encrypts a content COm by using a contents key included in the right information ROm and generates the encrypted content Enc_b (COm, ROm).
The recording device 720 is used as the user terminal, receives the right information ROm through a secure network 732, and receives the encrypted content Enc_b (COm, ROm). In the nonvolatile memory device 710, a mounted nonvolatile memory is divided into a secret region 711 and a user region 712.
The recording device 720 records the right information ROm in the secret region 711 of the nonvolatile memory device 710 through a secret communication means 722, and records the encrypted content Enc_b (COm, ROm) in the user region 712 by using a conventional writing means. Here, when a size of the secret region 711 is expanded, a size of the user region 712 that a user can freely use becomes small and thereby a user's convenience is impaired, and accordingly it is required to minimize the size of the secret region 711.
A reproduction device 721 reads the encrypted content Enc_b (COm, ROm) recorded in the user region 712 of the nonvolatile memory device 710 by using a conventional reading part. In addition, the device reads the right information ROm recorded in the secret region 711 via the secret communication means 722. And, a contents decryption part 723 decrypts the encrypted content Enc_b (COm, ROm) by using the contents key included in the right information ROm, and the device reproduces the content Com.
However, since the size of the secret region has to be fixed and the data amount of the right information ROm tends to increase, the size of the secret region has to be preliminarily large. Accordingly, the conventional method has a problem of reducing a region that a user can use.
Patent document 1 discloses a method to improve the problem.
Patent document 1: Japanese Unexamined Patent Publication No. 2004-194271
However, since separately requiring the static information IDu, the method increases information to be managed by a user and increases a management burden of the user. Since all of the right information recorded in a user region of a recording medium are encrypted by using one piece of the static information IDu as a key, all of the right information are at risk of the illegal use if the static information IDu is leaked. In addition, since a new encryption part and decryption part are added to a conventional recording device and reproducing device, the recording device and reproducing device have to be newly designed.
The present invention intends to provide a right information encryption module, a nonvolatile memory device, a right information recording system, a right information decryption module, a right information reading system, and a right information recording/reading system that are able to eliminate a possibility of capacity shortage of the secret region, the capacity shortage being caused by increase of data of the right information, without causing the above-mentioned problems.
To solve the problem, a nonvolatile memory device of the present invention comprises: a right information encryption module for encrypting and recording right information; a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information encryption module includes: a key generation part for generating key information used for encrypting the right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information to said key management information and for recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module, and wherein said right information decryption module includes: a right information reading part for reading the encrypted right information and the key management information that are connected each other and are recorded in said recording module; a key information reading part for reading the key information related to said key management information from said secret recording module; and a right information decryption part for decrypting the encrypted right information by using said key information.
To solve the problems, a nonvolatile memory device of the present invention comprises: a right information encryption module for encrypting and recording right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information encryption module includes: a key generation part for generating key information used for encrypting the right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information to said key management information and for recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module.
Said right information recording part may relate said key management information to said encrypted right information and output said key management information and said encrypted right information to an external apparatus and said external apparatus may output said key management information and said encrypted right information to said recording module.
Said right information recording part may relate said key management information to said encrypted right information and output said key management information and said encrypted right information to an external apparatus and said external apparatus may output said key management information and said encrypted right information to said recording module.
To solve the problems, a nonvolatile memory device of the present invention comprises: a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information decryption module includes: a right information reading part for reading key management information and encrypted right information obtained by encrypting right information of an encrypted content, the key management information and the encrypted right information being related each other and recorded in said recording module; a key information reading part for reading the key information related to said key management information from said secret recording module; and a right information decryption part for decrypting the encrypted right information by using said key information.
Said key management information and said encrypted right information that are connected each other may be once read from said recording module by an external apparatus and inputted to said right information reading part.
To solve the problems, a right information recording/reading system of the present invention comprises: a nonvolatile memory device; a right information outputting/reading device for writing and reading right information in and from said nonvolatile memory device; and a secret communication means for carrying out a secret communication between said nonvolatile memory device and said right information outputting/reading device, wherein said nonvolatile memory device comprises: a right information encryption module for encrypting and recording right information; a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, said right information encryption module includes: a key generation part for generating key information used for encrypting the right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information to said key management information and recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module, said right information decryption module includes: a right information reading part for reading the encrypted right information and the key management information that are connected each other and are recorded in said recording module; a key information reading part for reading the key information related to said key management information from said secret recording module; and a right information decryption part for decrypting the encrypted right information by using said key information, said right information outputting/reading device inputs the right information of the encrypted content to said nonvolatile memory device by using said secret communication means, and said nonvolatile memory device outputs the right information of the encrypted content to said right information outputting/reading device by using said secret communication means.
To solve the problems, a right information recording/reading system of the present invention comprises: a nonvolatile memory device; a right information output device for writing right information in said nonvolatile memory device; and a secret communication means for carrying out a secret communication between said nonvolatile memory device and said right information output device, wherein said nonvolatile memory device comprises: a right information encryption module for encrypting and recording right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, said right information encryption module includes: a key generation part for generating key information used for encrypting the right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information to said key management information and recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module, and said right information output device outputs the right information of the encrypted content to said nonvolatile memory device by using said secret communication means.
To solve the problems, a right information recording/reading system of the present invention comprises: a nonvolatile memory device; a right information output device for writing right information in said nonvolatile memory device; and a secret communication means for carrying out a secret communication between said nonvolatile memory device and said right information output device, wherein said nonvolatile memory device comprises: a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, said right information decryption module includes: a right information reading part for reading key management information and encrypted right information obtained by encrypting right information of an encrypted content, the key management information and the encrypted right information being related each other and recorded in said recording module; a key information reading part for reading the key information related to said key management information from said secret recording module; and a right information decryption part for decrypting the encrypted right information by using said key information, and said nonvolatile memory device outputs the decrypted right information of the encrypted content to said right information reading device by using said secret communication means.
To solve the problems, a right information encryption module of the present invention comprises: a key generation part for generating key information used for encrypting right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information generated by said right information encryption part and for relating said key information to said key management information and outputting said key information and key management information to an external device; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module.
Said right information recording part may relate said key management information to said encrypted right information and output said key management information and said encrypted right information to the external device.
To solve the problems, a right information decryption module of the present invention comprises: a right information reading part for inputting encrypted right information and key management information that are related each other from an external device; a key information reading part for inputting key information related to said key management information from the external device; and a right information decryption part for decrypting the encrypted right information by using said key information and for outputting the decrypted information to the external device.
Said right information reading part may input said key management information and said encrypted right information that are related each other from the external device.
A right information encryption module, a nonvolatile memory device, a right information recording system, a right information decryption module, a right information reading system, and a right information recording/reading system of the present invention reduce a size of data to be recorded in a secret region and does not newly require static information IDu to reduce information to be managed by a user, resulting in reduction of a management burden of the user. In addition, all pieces of right information to be recorded in a user region of the nonvolatile memory device are encrypted by individual keys generated in a recording medium, and if the key information is leaked, other pieces of the right information are not at risk of the illegal use. Since the key information used for encrypting the right information is not outputted to an outside of the nonvolatile memory device, the risk of leaking the information key is low.
In addition, a new encryption part and decryption part do not have to be added to a conventional recording device and reproducing device.
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g, and 110h Right information encryption module
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a Key generation part
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a Right information encryption part
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b and 116f Key management table
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e and 117f Falsification detection data generation part
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a Secret recording module
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a Recording module
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e Right information falsification detection part
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e, and 310h Nonvolatile memory device
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d External apparatus
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a Recording module
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a and 520b Right information output device
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a Secret communication means
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a Contents distribution server
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a Secure network
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a Non-secure network
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a Contents encryption part
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a and 620b Right information reading device
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a Secret communication means
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a Contents encryption part
Referring to drawings, embodiments of the present invention will be explained below. Notation of abbreviations in the present specification will be explained.
ROm: Right information of an encrypted content, including contents key information and contents view limitation information used for decrypting a content.
Km: Key information for encrypting and decrypting the right information, used when encrypting and decrypting one or more pieces of the right information.
Mm: Key management information relating the key information to the encrypted right information.
Am: Internal storage address of a secret recording module.
Hm: Falsification detection data used for a falsification detection of the right information.
Enc_x (A, B): Information obtained by encrypting A with a key of B in an encryption method X.
Enc_x and Dec_x: An encryption method and a decryption method in the x method, respectively.
The same numerals are added to the same components in the following respective embodiments and their modification examples, and detailed explanations of the same components will be omitted after their second appearance and different components will be mainly described.
The right information encryption module 110a internally has a key generation part 111a for generating a piece of key information Km based on the right information ROm given from the external apparatus 120a. The key information Km generated by the key generation part 111a is a string of random numbers serving as a unique value in each of the right information or in units of a plural pieces of the right information, or is a value equivalent to the string of random numbers. In addition, m is the natural number used for specifying each of the key information.
A right information encryption part 112a encrypts the right information ROm on the basis of the key information Km generated by the key generation part 111a. As an encryption method used by the right information encryption part 112a, the DES, the triple DES, the AES code, and the like are generally employed, but the encryption method is not limited to them and an arbitrary encryption method may be employed.
The key information recording part 114a generates a piece of key management information Mm in each of the key information Km, and connects the key management information Mm to the key information Km and records them in the secret recording module 130a. The key management information Mm is used for relating the key information Km to a piece of encrypted right information Enc_a (ROm, Km), and arbitrary information can be determined as the management information if being able to be distinguished from other key information. When the key management information Mm is used, the key information Km can be specified in decrypting the encrypted right information Enc_a (ROm, Km).
The right information recording part 115a records the encrypted right information Enc_a (ROm, Km) and the key management information Mm in the recording module 140a.
The secret recording module 130a is a recording module that cannot be accessed from other than the key information recording part 114a. The recording module 140a can be accessed also from other than the right information recording part 115a, and records data other than the encrypted right information.
Next, an operation of the present embodiment will be explained. The external apparatus 120a inputs the right information ROm to the right information encryption part 112a, and the key generation part 111a inputs the generated key information Km to the right information encryption part 112a. The right information encryption part 112a encrypts the right information ROm in an encryption method a, and outputs the encrypted right information Enc_a (ROm, Km) to the right information recording part 115a. The right information recording part 115a connects the key management information Mm to the encrypted right information Enc_a (ROm, Km), and records them in the recording module 140a. Meanwhile, the key information recording part 114a connects the key management information Mm to the key information Km, and records them in the secret recording module 130a. In this manner, since the sizes of the key management information Mm and the key information Km are small, the size of information to be recorded in the secret recording module 130a also can be small.
The secret recording module 130a and the recording module 140a may be configured by dividing a region of an identical nonvolatile memory. In this case, the division of the region has to be clearly separated. In the case where the secret recording module 130a and the recording module 140a are configured in an identical nonvolatile memory, a memory size of the nonvolatile memory is limited, and accordingly a memory size of the recording module 140a that a user can freely use is reduced when a memory size of the secret recording module 130a is large. However, since an amount of data to be recorded in the secret recording module 130a is small in the present embodiment, larger memory size can be allocated to the recording module 140a and thus a user's convenience is improved.
The secret module 130a and the recording module 140a may be configured in separate nonvolatile memories. In this case, it is preferable to employ an EEPROM suitable for access in small units of data as the secret module 130a and employ an NAND type flash memory suitable for a large memory capacity as the recording module 140a. The EEPROM is expensive compared to the NAND type flash memory, but since the amount of data to be recorded in the secret recording module 130a is small in the present embodiment, a memory size required for the EEPROM can be reduced and thereby the cost can be reduced.
The present embodiment does not require the static information IDu specific to a user according to Patent document 1. The right information ROm recorded in the recoding module 140a is encrypted originally on the basis of the individual key information Km generated by the key generation part 111a, and even if one piece of the key information is leaked, other pieces of the right information accordingly are not at risk of the illegal use. In addition, since the key information Km used for encrypting the right information ROm is not outputted to outsides of the right information encryption module 110a and the secret recording module 130a, the key information Km is not at risk of the leaking to the outside.
In addition, the key information K1 to Km are subsequently recorded at continuous addresses from 0001 in
Next, referring to
In this manner, in a case where a malicious user illegally falsified the encrypted right information Enc_a (ROm, Km) recorded in the recoding module 140a, the embodiment can detect in the reading whether or not the falsification has been made.
Next, an operation of the present embodiment will be explained. The right information reading part 215a reads the connected encrypted right information Enc_a (ROm, Km) recorded in the recording module 140a and outputs the information to the right information decryption part 212a, and reads the key management information Mm and outputs the information to the key information reading part 214a. The key information reading part 214a reads the key information Km connected to the key management information Mm from the secret recording module 130a, and outputs the information to the right information decryption part 212a. The decryption part 212a decrypts the encrypted right information Enc_a (ROm, Km) by using the key information Km, and outputs the right information ROm to the external apparatus 120a.
In this manner, it can be verified inside the right information decryption module 210e that a state of the encrypted right information Enc_a (ROm, Km) recorded in the recording module 140a is the same as that at the time when the information has been recorded. And, if a malicious user illegally falsified the encrypted right information Enc_a (ROm, Km) recorded in the recoding module, the embodiment can detect in the reading that the falsification has been made. In this case, since the decryption module does not output the right information ROm, the embodiment can make the illegal falsification meaningless.
In addition,
The secret recording module 330a and the recording module 340a may be configured by dividing a region of an identical nonvolatile memory. In this case, the division of the region has to be clearly separated. Additionally, since an amount of data to be recorded in the secret recording module is small in the present embodiment, larger memory size can be allocated to the recording module 340a and thus a user's convenience is improved.
The secret module 330a and the recording module 340a may be configured in separate nonvolatile memories. In this case, it is preferable to employ an EEPROM suitable for access in small units of data as the secret module 330a and employ an NAND type flash memory suitable for a large memory capacity as the recording module 340a. The EEPROM is expensive compared to the NAND type flash memory, but since the amount of data to be recorded in the secret recording module 330a is small in the present embodiment, a memory size required for the EEPROM can be reduced and thereby the cost can be reduced.
In addition, the present embodiment does not require the static information IDu specific to each user according to Patent document 1 and encrypts all of the right information ROm recorded in the recoding module 340a is encrypted on the basis of the individual key generated by the key generation part 111a, and even if one piece of the key information is leaked, other pieces of the right information accordingly are not at risk of the illegal use. In addition, since the key information Km is not outputted to the outside of the nonvolatile memory device 310a, the key information Km is not at risk of the leaking to the outside.
Here, in the case of manufacturing the nonvolatile memory device as the memory card, the nonvolatile memory device has an excellent portability and is expected to be used as a recording medium for safely recording the right information of the encrypted contents.
The first to third modification examples can be applied to the fifth embodiment as well as the first embodiment, and the above-mentioned effect can be obtained in that case.
In addition, the first to third modification examples of the second embodiment can be applied to the fifth embodiment as well as the first embodiment, and the above-mentioned effect can be obtained in that case.
The contents distribution server 560a generates the right information ROm with respect to the contents information COm. Then, the contents encryption part 563a encrypts the contents information Com on the basis of a contents key included in the right information ROm, and calculates the encrypted content Enc_b (COm, ROm). The contents server 560a sends the encrypted contents information to the right information output device 520a via the non-secure network 562a, and sends the right information ROm via the secure network 561a. In addition, the encrypted contents information can be distributed by the means other than the non-secure network 562a, for example, by being recorded in a CD-ROM or a memory card.
The right information output device 520a inputs the right information ROm to the right information encryption part 112a of the nonvolatile memory device 310e through the secret communication means 550a. In addition, since having the recording module 340a accessible from the right information output device 520a, the nonvolatile memory device 310e records the encrypted content Enc_b (COm, ROm) received from the contents server 560a in the recording module 340a. Additionally, in stead of this, the encrypted contents information may be retained in a memory in the right information output device 520a or may be recorded in another recording medium. The following procedures of the encryption and the recording of the right information ROm are the same as those shown in the fifth or the sixth embodiment.
Patent document 1 shown in
In the following description, the system employing the nonvolatile memory device 410e will be explained. When the falsification has not been detected, the nonvolatile memory device 410e outputs the right information ROm to the right information reading device 620a through the secret communication means 650a in accordance with the procedure shown in the eighth embodiment. The right information reading device 620a decrypts the encrypted content Enc_b (COm, ROm) by using the contents key included in the ROm at the contents decryption part 661a, and outputs the contents Com.
Here, an example of the encrypted content Enc_b (COm, ROm) recorded in the recording module 340a is shown, but a recording location of the encrypted content Enc_b (COm, ROm) may be other than the recording module 340a.
In
Patent document 1 shown in
Meanwhile, a nonvolatile memory device according to the present invention may comprise: a right information encryption module for encrypting and recording right information; a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information encryption module may include: a key generation part for generating key information used for encrypting the right information; a falsification detection data generation part for generating falsification detection data used for falsification detection of said right information from said right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information, said key management information, and said falsification detection data each other and for recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module, and wherein said right information decryption module may include: a right information reading part for reading the encrypted right information and the key management information that are connected each other and are recorded in said recording module; a key information reading part for reading said falsification detection data and the key information related to said key management information from said secret recording module; a right information decryption part for decrypting the encrypted right information by using said key information; and a falsification detection part for detecting falsification of the right information by using said falsification detection data and outputting the decrypted right information only in a case where the falsification has not been detected.
A nonvolatile memory device according to the present invention may comprise: a right information encryption module for encrypting and recording right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information encryption module may include: a key generation part for generating key information used for encrypting the right information; a falsification detection data generation part for generating falsification detection data used for falsification detection of said right information from said right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information and for relating said key information to said key management information and for recording said key information and key management information in said secret recording module; and a right information recording part for relating said key management information to said encrypted right information and for recording said key management information and said encrypted right information in said recording module.
A nonvolatile memory device according to the present invention may comprise: a right information decryption module for reading and decrypting the encrypted right information; a secret recording module for recording highly-secret information; and a recording module for recording arbitrary information, wherein said right information decryption module may include: a right information reading part for reading key management information and encrypted right information obtained by encrypting right information of an encrypted content, the key management information and the encrypted right information being related each other and recorded in said recording module; a key information reading part for reading the key information related to said key management information and falsification detection data used for falsification detection from said secret recording module; a right information decryption part for decrypting the encrypted right information by using said key information; and a falsification detection part for detecting falsification of the right information by using said falsification detection data and outputting the decrypted right information only in a case where the falsification has not been detected.
A right information encryption module according to the present invention may comprise: a key generation part for generating key information used for encrypting right information; a falsification detection data generation part for generating falsification detection data used for falsification detection of said right information from said right information; a right information encryption part for generating encrypted right information by encrypting the right information of an encrypted content inputted from an external device by using the key information generated by said key generation part; a key information recording part for generating key management information that relates the key information generated by said key generation part to the encrypted right information generated by said right information encryption part and for relating said key information, said key management information, and said falsification detection data each other and outputting said key information and key management information to an external device; and a right information recording part for relating said key management information to said encrypted right information and for outputting said key management information and said encrypted right information to the external device.
A right information decryption module according to the present invention may comprise: a right information reading part for inputting encrypted right information and key management information that are related each other from an external device; a key information reading part for inputting key information related to said key management information and falsification detection data used for falsification detection of the right information from the external device; a right information decryption part for decrypting the encrypted right information by using said key information and for outputting the decrypted information to the external device; and a falsification detection part for detecting falsification of the right information by using said falsification detection data and outputting the decrypted right information only in a case where the falsification has not been detected.
The present invention can be expected to serve as not only a conventional memory card but also a right information protection function module incorporated in an audio apparatus and video apparatus having a storage function that essentially requires the protection of the right information, the apparatuses being applied to a network type contents distribution service.
Number | Date | Country | Kind |
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2007-116773 | Apr 2007 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2008/000504 | 3/10/2008 | WO | 00 | 10/7/2009 |