JP2006294091A - Content writing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content writing system that can improve the protection of the content without consuming the data area the user can use by writing the encrypted content in the protected area on a recording medium. <P>SOLUTION: In the content writing system 10, the content key 16 is enciphered by the key encryption means 15 and the enciphered content 6 is recorded in the protected area 5 on the recording medium 1. A content 19 is enciphered by the data encryption means 17 using the content key 16, and the enciphered content 8 is written in the protected area 5 on the recording medium 1. Further, the content writing system 10 can instruct the recording medium 1 to change its ratio of the data area 7 and the protected area 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a content writing apparatus for a recording medium with an enhanced content protection function.

  In recent years, the spread of online content distribution has increased, and there has been an increasing need for receiving paid content with a portable terminal and storing it in a recording medium such as a memory card. Content providers, on the other hand, require the introduction of a strong copyright protection system to eliminate illegal copying and distribute high-quality content with peace of mind.

  FIG. 4 is a block diagram showing a configuration of a conventional content writing apparatus that writes content on a recording medium in consideration of such copyright protection. In this example, for example, the system of FIG. 4 is operated by a user, and it is assumed that content 89 on the Internet is downloaded, for example.

  In FIG. 4, the recording medium 71 has a ROM area 72 that cannot be written but can only be read, a protection area 75 that can be read and written when mutual authentication is successful, and a data area 77 that can be read and written regardless of the mutual authentication result. The recording medium ID 73 and the mutual authentication key 74 that are unique to the recording medium are stored and can only be read, the encrypted content key 76 is written in the protected area 75, and music, video, still image, An encrypted content 78 obtained by encrypting content such as a game is written.

  The conventional content writing device 80 generates the medium specific information 83 from the recording medium ID 73 and the mutual authentication key 74 in the ROM area 72 of the recording medium 71 and the device key 84 stored in the external recording medium IF means 81. , Mutual authentication processing means 82 for mutual authentication with the connected recording medium 71, and key encryption / decryption means for encrypting / decrypting the content key 86 with the medium specific information 83 including the specific information of the recording medium 71 85, and data encryption / decryption means 87 for encrypting the content 89 stored in the content writing device 80 using the content key 86.

  The operation will be described below with reference to FIG. When the recording medium 71 is connected to the content writing device 80, the mutual authentication processing means 82 is stored in the recording medium ID 73 and the mutual authentication key 74 in the ROM area 72 of the recording medium 71 and the external recording medium IF means 81. The medium specific information 83 is generated from the device key 84, and mutual authentication is performed between the recording medium 71 and the writing device 80. If the mutual authentication is successful, the key encryption / decryption means 85 encrypts the content key 86 stored in the external recording medium IF means 81 using the medium specific information 83. Next, the encrypted content key 76 is written in the protected area 75 of the recording medium 71.

  The data encryption / decryption means 87 encrypts the content 89 stored in the content writing device 80 with the content key 86 and writes the encrypted content 78 in the data area 77 of the recording medium 71.

In Patent Document 1, when transmitting data encrypted in this way to another counterpart device, the parameter information for generating the encryption key is encrypted and transferred to the counterpart device. Technology is shown.
Japanese Patent Laid-Open No. 2000-100069

  In the configuration of a conventional system for writing content on a recording medium in consideration of copyright protection, when writing encrypted content in the data area of the recording medium, the pre-recorded content is written on the recording medium in advance and sold or distributed. When the encrypted content is stored in the data area of the recording medium in the medium, the encrypted content stored in the data area is visible to the user. At this time, the content is encrypted and copyright protection is provided for the copy, but there is a problem that the user who uses it deletes the encrypted content by mistake.

  Further, in prerecorded media in which content is written in advance on a recording medium and sold or distributed, if encrypted content is stored in the data area of the recording medium, the capacity of the data area that can be used by the user is also reduced.

  The present invention solves such a problem, and in a system for writing content to a recording medium, the content protection function is further strengthened by writing the encrypted content to the protected area of the recording medium, and the data area that can be used by the user is further improved. The object is to provide a system that does not consume capacity.

  In order to address the above problems, the content writing apparatus of the present invention writes the encrypted content encrypted with the content key to the protected area of the recording medium, and encrypts the content key using the medium specific information to Write to the protected area. Further, the content writing device changes the ratio of the capacity of the protection area and the data area of the storage medium.

  According to the content writing device of the present invention, when writing encrypted content, the content is first encrypted with the content key, and the content key is created from the mutual authentication key of the recording medium and the device key of the content writing device Data area that can be used by the user while further enhancing the content protection function because it is encrypted using medium-specific information and the encrypted content and encrypted content key are stored in the protected area of the recording medium. There is an advantage of not being aware of the capacity reduction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment of the present invention, the content writing device writes the content on a recording medium connected to the content writing device. Here, the content provider side that sells / distributes the content installs on the recording medium. The content is encrypted and recorded, the encrypted content key is decrypted by the terminal device or content writing device owned by the user, and the content is reproduced.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a content writing apparatus and a recording medium according to Embodiment 1 of the present invention, and shows functions when writing content. 2 is a block diagram showing the configuration of the content writing device and the recording medium when the capacity of the protection area and the data area of the recording medium is changed, and FIG. 3 is the configuration of the content writing apparatus and the recording medium when decrypting the encrypted content. FIG.

(1) Operation at the time of content writing in the content writing apparatus In FIG. 1, a recording medium 1 includes a ROM area 2 that can only be read, a protected area 5 that can be read and written when mutual authentication is successful, and a data area that can be read and written regardless of the mutual authentication result 7 In the ROM area 2, a recording medium ID 3 unique to the recording medium 1 and a mutual authentication key 4 are stored and recorded in a state in which they can only be read. In the protected area 5, an encrypted content key 6 and an encrypted content 8 obtained by encrypting content such as music, a moving image, a still image, and a game are written.

  The content writing device 10 generates the medium specific information 13 from the recording medium ID 3 and the mutual authentication key 4 in the ROM area 2 of the recording medium 1 and the device key 14 stored in the external recording medium IF means 11 and connects them. And a mutual authentication processing means 12 for performing mutual authentication with the recorded recording medium 1, and encryption of the content key 16 using the medium unique information 13 and writing as an encrypted content key in the protected area 5 of the recording medium 1 Means 15 and data encryption means 17 for encrypting the content 19 using the content key 16 and writing the encrypted content in the protected area of the recording medium 1.

  Next, a procedure for writing the content 19 to the recording medium 1 by the content writing apparatus 10 and the contents thereof will be described with reference to FIG.

  In the content writing device 10, when the recording medium 1 is connected to the content writing device 10, the mutual authentication processing means 12 performs the recording medium ID 3 and the mutual authentication key 4 in the ROM area 2 of the recording medium 1 and the external recording medium IF. The medium specific information 13 is generated from the device key 14 stored in the means 11, and mutual authentication is performed between the recording medium 1 and the content writing apparatus 10. If the mutual authentication is successful, the key encryption unit 15 encrypts the content key 16 stored in the external recording medium IF unit 11 using the medium specific information 13. Next, the encrypted content key 6 is written in the protected area 5 of the recording medium 1.

  In addition, the content encryption unit 17 encrypts the content 19 stored in the content writing device 10 using the content key 16. Next, the encrypted content 8 is written in the protected area 5 of the recording medium 1.

(2) Operation when the capacity of the protection area and data area of the recording medium is changed In FIG. 2, the recording medium 1 includes a ROM area 2 that can only be read, a protection area 5 that can be read and written when mutual authentication is successful, and a mutual authentication result A data area 7 that can be read and written, a protection area 5, and a data area for changing the capacity of the data area 7 and a capacity changing means 21 for the protection area are provided.

  Further, the content writing apparatus 10 includes the external recording medium IF unit 11 that communicates with the recording medium 1, the data area of the recording medium 1, and the capacity of the data area and protection area to instruct the capacity change unit 21 of the protection area to change capacity. Control means 22 is provided. 2 is for explaining means added to the configuration of the recording medium 1 and the content writing apparatus 10 in FIG. 1, and other means shown in FIG. 1 are omitted.

  Next, a procedure for changing the capacities of the data area 7 and the protection area 5 of the recording medium 1 in the content writing apparatus 10 and the contents thereof will be described with reference to FIG. In the content writing device 10, when the recording medium 1 is connected to the content writing device 10, mutual authentication is performed between the recording medium 1 and the content writing device 10 according to the procedure described in FIG. After successful mutual authentication, the content writing apparatus 10 uses the data area and protected area capacity control means 22 to transfer the data area 7 and the protected area 5 to the data area and protected area capacity changing means 21 of the recording medium 1. When the capacity is instructed, the data area and protection area capacity changing means 21 of the recording medium 1 changes the capacity of the data area and the protection area based on the new capacity of the data area 7 and the protection area 5. The capacities of the data area 7 and the protection area 5 can be varied in 256 ways, for example, when the capacity ratio is indicated by 8-bit information.

(3) Operation at the time of reproducing content from a recording medium in the content writing device Next, the content writing device 10 has the encrypted content 8 written therein, and the recording medium 1 is decrypted and reproduced by the content writing device 10 The procedure and contents in this case will be described with reference to FIG.

  The content writing device 10 is basically the same as the content writing device 10 of FIG. 1, but for the sake of simplicity, portions not described in FIG. 1 are added, and the additional portions will be described. The external recording medium IF unit 11 includes a data decrypting unit 27 for decrypting and reproducing the encrypted content 8 encrypted, and a content 19a decrypted and reproduced by the data decrypting unit 27. This content 19a is substantially the same as the content 19 of FIG. The other parts are the same as those in FIG.

  Next, with regard to the content writing apparatus configured as described above, a procedure for reproducing content from a recording medium by the content writing apparatus and the contents thereof will be described with reference to FIG. When the recording medium 1 is connected to the content writing apparatus 10, the content writing apparatus 10 includes the mutual authentication processing means 12 that records the recording medium ID 3 and the mutual authentication key 4 in the ROM area 2 of the recording medium 1 and the external recording medium IF. The medium specific information 13 is generated from the device key 14 stored in the means 11, and mutual authentication is performed between the recording medium 1 and the content writing apparatus 10.

  Next, if mutual authentication is successful, the key decryption means 25 calls the encrypted content key 6 from the protected area 5 of the recording medium 1 and decrypts it using the medium specific information 13 to obtain the content key 16a. Then, the data decryption means 27 calls the encrypted content 8 from the protected area 5 of the recording medium 1, decrypts it using the content key 16a, and reproduces the content 19a.

  As described above, according to the present embodiment, the content writing device 10 stores the encrypted content and the encrypted content key in the protected area of the recording medium, so that the content protection function can be further enhanced. In addition, a system that does not consume the capacity of the data area that can be used by the user can be realized.

  In addition, each component of the external recording medium interface means of each content writing apparatus in the above embodiment can be realized by individual hardware or software.

  Further, although the content is not particularly mentioned, it is needless to say that the content of the content such as audio information, video information, computer usable data, and mixed data thereof is not limited.

  Further, it goes without saying that the recording medium can be applied regardless of the type of semiconductor memory, optical disk, magnetic disk or the like.

  As described above, the content writing device according to the present invention can be used by the content writing device to protect the recording medium for the purpose of strong copyright protection for content providers to eliminate illegal copying and distribute high-quality content with peace of mind. It is possible to record encrypted content in advance, decrypt and reproduce the content, further enhance content protection, and is useful in devices and systems that handle video and audio content.

1 is a block diagram showing a configuration of a content writing device and a recording medium according to Embodiment 1 of the present invention. FIG. 3 is a block diagram showing a configuration of a content writing device and a recording medium when the capacity of the protection area and data area of the recording medium is changed according to the first embodiment FIG. 3 is a block diagram showing a configuration of a content writing device and a recording medium when decrypting encrypted content according to the first embodiment Block diagram showing the configuration of a conventional content writing device and recording medium

Explanation of symbols

1 Recording medium 2 ROM area 3 Recording medium ID
4 Mutual Authentication Key 5 Protected Area 6 Encrypted Content Key 7 Data Area 8 Encrypted Content 10 Content Writing Device 11 External Recording Medium IF Unit 12 Mutual Authentication Processing Unit 13 Medium Specific Information 14 Device Key 15 Key Encrypting Unit 16, 16a Content key 17 Data encryption means 19, 19a Content 21 Data area and protection area capacity change means 22 Data area and protection area capacity control means 25 Key decryption means 27 Data decryption means

Claims (5)

Means for writing the encrypted content encrypted with the content key to the protected area of the recording medium;
Means for encrypting the content key with medium-specific information and writing it in a protected area of the recording medium. A mutual authentication processing means for performing mutual authentication based on data in the ROM area, a recording medium having a ROM area, a protection area and a data area, and generating medium-specific information;
Data encryption means for encrypting the content based on the content key;
Key encryption means for encrypting the content key based on the medium specific information,
A content writing apparatus, wherein the content encrypted by the data encryption unit and the content key encrypted by the key encryption unit are written in a protected area of the recording medium. 3. The content writing apparatus according to claim 2, further comprising capacity control means for changing the capacity of the protection area and the data area of the recording medium. A mutual authentication processing means for performing mutual authentication based on data in the ROM area, a recording medium having a ROM area, a protection area and a data area, and generating medium-specific information;
Data encryption means for encrypting the content based on the content key and writing it in the protected area of the recording medium;
Key encryption means for encrypting the content key based on the medium specific information and writing it in a protected area of the recording medium;
A key decryption means for reading the encrypted content key from the protected area of the recording medium and performing decryption based on the medium-specific information;
A content writing / reading apparatus comprising: a data decrypting unit that reads the encrypted content from the protected area of the recording medium and decrypts the content based on the decrypted content key. 5. The content writing / reading apparatus according to claim 4, further comprising capacity control means for changing the capacity of the protection area and the data area of the recording medium.

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