JP2008293161A - Recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a function which protects copyright of digital content data in a high-capacity recording medium, enables all the functions of an SD card even if the SD card used to protect content in an HDD is installed in other device. <P>SOLUTION: A recording medium 1400 can be used as a recording medium with a normal authentication function, by concealing the fact that an authentication area 1422 in the recording medium 1400 exists in other device. Also, content data in the recording medium 1500 is encrypted to protect copyright. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a device for protecting copyright when recording and reproducing digital data such as audio and video.

  In recent years, opportunities for personal enjoyment of digital video content and digital music content have increased, and along with this, there are various types of content copyright protection between those who have copyright of digital content and those who enjoy it individually. Have been proposed.

  Among them, as a very strong copyright protection method, there is a CPRM (Content Protection for Recordable Media) technology adopted in an SD (Secure Digital) card, a DVD (Digital Versatile Disk) -RAM, or the like. However, media such as SD cards currently exist, and it must be said that it is a recording medium with a very small capacity for recording video content as compared with HDD (Hard Disk Drive) such as 4 GB.

  Recently, data that a user desires to store in a medium has a huge amount of data such as video data, and therefore, a recordable time is considerably limited in a medium such as an SD card. Therefore, an inexpensive and large-capacity recording medium such as an HDD is suitable as a medium for recording huge data such as video data. However, the HDD generally does not have a function for protecting the copyright on the content to be recorded.

One of the methods for recording video content and music content on a large-capacity recording medium such as an HDD while protecting the copyright, while simultaneously using a function of a semiconductor memory having a copyright protection function such as an SD card, A method has been proposed in which copyright protection is performed on digital content recorded on the HDD. (For example, see Patent Document 1)
JP 2004-94778 A

  However, in the above-described conventional configuration, a function capable of encrypting content data in a large-capacity recording medium such as an HDD by using an SD card having a copyright protection function and protecting the copyright of the data. However, it is difficult to use the SD card used for encryption as a normal SD card by attaching it to another device. In addition, when the authentication area in which the encryption key used when encrypting the content in the HDD is stored is formatted, not only the encryption key used when encrypting the content in the normal area of the SD but also the HDD The encryption key when encrypting the content inside is also deleted.

  This is because a FAT (File Allocation Table) file system is constructed in the authentication area, a directory for SD or a directory for HDD is created in that, and the encryption keys of SD and HDD are stored in the directory. If this area is formatted, all encryption key data is erased. Therefore, if the SD card is formatted in a device that does not know that the SD and HDD keys exist, even the encryption key data on the HDD side that is not supposed to be erased is erased.

  In the present invention, the copyright of digital content data in a large-capacity recording medium is protected, and even if the SD card used for protecting the content in the HDD is attached to another device, the SD card itself is protected. It is an object of the present invention to provide a function that can use all the functions, and to provide a function that does not erase the encryption key on the HDD side even if the authentication area inside the SD card is formatted.

  In order to solve the conventional problems, the recording / reproducing apparatus of the present invention includes a first recording medium having a copyright protection function, a second recording medium having no copyright protection function, and the first recording medium. The medium stores a plurality of authentication area storage units for storing key data of encrypted content data of the first recording medium and the second recording medium, and size information of the authentication area storage unit In the recording / reproducing apparatus having the card information register unit, the size information of the authentication area storage unit of the card information register unit is the size of the authentication area for the first recording medium.

  Furthermore, the recording / reproducing apparatus of the present invention initializes the authentication area of the first recording medium corresponding to the second recording medium when performing the initialization process of the second recording medium. It is a feature.

  Further, the recording / reproducing apparatus of the present invention, when performing the initialization process of the first recording medium, the initial area of the normal area for storing the authentication area corresponding to the first recording medium and normal data. It is characterized by performing the conversion processing.

  Further, the second recording medium is any one of a magnetic recording medium, an optical recording medium, and a semiconductor medium.

As described above, according to the present invention, the copyright of the HDD is protected while the content in the large-capacity recording medium such as the HDD is protected using the semiconductor memory having the copyright protection function such as the SD card. Therefore, even if the semiconductor memory having the copyright protection function used for this purpose is attached to another device, it can be used as a normal medium.
Further, even if the SD authentication area is formatted by another device, the HDD content can be reproduced without deleting the encryption key used when the content in the HDD is encrypted.

  Embodiments of the recording / reproducing apparatus of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a block diagram of a recording / reproducing apparatus in Embodiment 1 of the present invention. In FIG. 1, 1000 denotes a recording / reproducing apparatus of the present invention, 1100 denotes a central processing unit (CPU (Central Process Unit)), 1200 denotes a data bus, 1300 denotes a host controller, and 1400 has a copyright function. Reference numeral 1500 denotes a first recording medium, and reference numeral 1500 denotes a second recording medium.

  The central processing unit 1100 performs calculation of data, control of each component, and the like. The data bus 1200 is a result of the calculation performed by the central processing unit 1100 and recording media such as the first recording medium 1400 and the second recording medium 1500. The above data flows through the host controller 1300. The host controller 1300 is controlled by the central processing unit 1100 and provides a data read / write function from the first recording medium 1400 and the second recording medium 1500. Further, authentication processing for the first recording medium 1400 is also performed.

  The first recording medium 1400 has a copyright protection function, and the recording medium information 1410 storing information indicating the characteristics of the first recording medium 1400 and the recording medium can be accessed only when authentication is successful. An authentication area 1420 as an area to be used and a normal area 1430 that can be accessed without requiring authentication. Further, the authentication area 1420 includes an authentication area 1421 for storing an encryption key used when encrypting content data in the normal area 1430 of the first recording medium 1400 and a normal area 1510 of the second recording medium 1500. The authentication area 1422 stores an encryption key used when encrypting stored content data.

  The second recording medium 1500 includes a normal area 1510 that is an area that does not require authentication.

  In this embodiment, for example, the first recording medium 1400 will be described as an SD card, and the second recording medium 1500 will be described as an HDD. Hereinafter, the first recording medium is referred to as an SD card, and the second recording medium is referred to as an HDD.

  The SD card 1400 copyrights digital video content data (which may be MPEG or other video compression format or non-compressed data) or digital music data (which may be MP3 or other compressed data or non-compressed data). When recording while protecting, authentication is first performed between the SD card 1400 and the recording / reproducing apparatus. If the authentication is successful, the authentication area 1421 and the authentication area 1422 can be accessed. The actual digital content data is encrypted and stored in the normal area 1430 of the SD card 1400. The key used for encrypting the digital video content is stored in the authentication area 1421.

  When reproducing digital content data with copyright protection measures from the SD card 1400, first, the digital content data to be reproduced from the authentication area 1421 after successful authentication between the recording / reproducing apparatus 1000 and the SD card 1400 is supported. At the same time, the encrypted data is read from the normal area 1430, and the encrypted content data is decrypted using the key data already read from the authentication area 1421 to reproduce the data.

  The HDD 1500 has a larger recording capacity than the SD card 1400, and can store a large amount of digital video content data and digital music content data compared to the SD card 1400.

  When content data is recorded on the HDD 1500, authentication is first performed between the SD card 1400 and the recording / playback apparatus 1000, and if the authentication is successful, the authentication area 1422 can be accessed, so the content to be recorded is encrypted. The encryption key data used at the time of writing is written in the authentication area 1422, and at the same time, the encrypted content data is written in the normal area 1510 of the HDD 1500.

  In order to reproduce the encrypted content data stored in the normal area 1510, first, after successful authentication between the SD card 1400 and the recording / reproducing apparatus 1000, the encryption to be reproduced from the authentication area 1422 for the HDD 1500 The key data corresponding to the encrypted content is read, and at the same time, the encrypted content data in the HDD 1500 is read from the normal area 1510, and the encryption is decrypted using the key data already read from the authentication area 1422 to reproduce the data.

  Further, as a method of dividing the authentication area in the SD card 1400 into a plurality of pieces, for example, division can be performed as follows. The recording medium information 1410 holds SD card information (for example, CSD (Card Specific Data) register). For example, the entire capacity of the SD card, the supported current value, sector size, file system type, and authentication area size There is.

  In carrying out the present invention, the authentication area 1420 is divided into a plurality of areas. For this purpose, the value representing the size of the authentication area in the recording medium information 1410 is rewritten to the size of the authentication area 1421 instead of the actual size of the authentication area. A plurality of areas 1421 and 1422 exist in the authentication area 1420, and each authentication area has a file management system such as FAT. However, in the present invention, information indicating how many partitions are in the recording medium such as MBR (Master Boot Recorder) is not provided at the head of the authentication area 1420.

  This is because, for example, when an SD card having partition information is attached to another device, the authentication area 1421 and the authentication area 1422 can be accessed as long as authentication is successful. Being accessible means that the data in it can be freely modified. Therefore, if the existence of the authentication area 1422 is recognized by another device, and it is mounted and the data is deleted, the encrypted content data on the HDD 1500 cannot be reproduced.

  Therefore, as described above in the present invention, the size of the authentication area is different from the actual size and is a small amount (the size of the authentication area 1421). It can be used. Further, since the authentication area 1422 cannot be accessed by other devices, the encryption key for the HDD 1500 is not deleted.

  Further, the authentication area 1420 in the SD card 1400 is divided into a plurality of authentication areas, and among these, the top area is used as the authentication area of the SD card itself. In this way, even if the SD card is installed in a device other than the recording / reproducing device of the present invention, it can be used as a normal SD card. Further, as described above, since the size of the authentication area for the SD card is recorded to be small, the authentication area 1422 for the HDD is not destroyed.

  The number of authentication areas 1420 in the SD card is not limited to two, but the same number of authentication areas as the recording media existing in the recording / reproducing apparatus are secured.

  In order to reproduce the contents of the HDD, it is necessary to determine where the authentication area for the HDD starts. This is because there is no partition information of the authentication area in the SD card. Therefore, the recording / reproducing apparatus of the present invention first acquires the size of the authentication area used for the SD card 1400 from the size of the authentication area in the recording medium information 1410 of the SD card 1400.

  Since it is used for the SD card 1400 up to that point, it is determined that the authentication area 1422 for the HDD 1500 starts from the size of the authentication area 1421 + 1, and is authenticated as the file system start position for the HDD 1500. The file information of the area 1422 is acquired. By doing so, the encryption key for the HDD 1500 can be acquired, and reproduction can be performed while decrypting the encrypted content data in the HDD 1500.

  Further, a method of area division will be described with reference to FIG. When the SD card is inserted into the recording / reproducing apparatus of the present invention, authentication is first performed to confirm that the SD card is a normal card between the SD card and the recording / reproducing apparatus (steps 2001 and 2002).

  If the authentication is successful, the authentication area in the SD card can be accessed, but if the authentication fails, the card is an illegal card and an error process is performed and the process is terminated. If the authentication is successful, it is checked whether the authentication area is divided so that it can be used by the recording / reproducing apparatus of the present invention (step 2003). If it is divided, it ends normally. If it is not divided, it is confirmed whether the key data already exists in the authentication area (step 2004).

  If the key data exists in the authentication area, the key data is temporarily saved in a different area from the authentication area (step 2006). After the key data is evacuated or when the key data does not exist in the authentication area, the number of normal areas including the SD card mounted on the recording / reproducing apparatus of the present invention and the capacity thereof are investigated. (Step 2005). After that, the authentication area is divided into a number of authentication areas. The size is basically determined according to the capacity ratio (step 2007).

  After the area division is completed (step 2008), a structure for managing data in the area such as a file system is created for each area (step 2009). When the key data saved in advance exists when the creation of the file system or the like is completed (step 2010), it is written back to the corresponding authentication area (step 2011).

  Further, an explanation will be given in the authentication area of the SD card with reference to FIG.

  The size of the authentication area 1 is the size of the authentication area described in the recording medium information 1410 of the SD card. The start address of the authentication area 2 is a position continuous from the last position of the authentication area 1, and the last address of the authentication area 2 corresponds to immediately before the start of the normal area.

Therefore, the size of the authentication area 2 is the value obtained by subtracting the last address (S2) of the authentication area 1 from the address (U1) at which the normal area starts.
In addition, when formatting the encrypted content of the HDD, the file system in 1422 which is the authentication area 2 of the SD card is formatted, and subsequently the HDD is also formatted.

  On the other hand, when taking the SD card to another machine and formatting the SD card, the size of the authentication area from the SD card is equivalent to the size of the authentication area described in the recording medium information 1410 (from the actual size). Only the authentication area 1 is formatted, and the area up to the authentication area 2 is not formatted.

  Therefore, when the SD card is inserted into the recording / reproducing apparatus again, the encrypted content in the HDD can be reproduced using the key information in the authentication area 2 in the SD card.

  A recording medium and a recording / reproducing apparatus having a copyright protection function according to the present invention protect a content in a large-capacity recording medium such as an HDD using a semiconductor memory having a copyright protection function such as an SD card. On the other hand, it has a function that can be used as a normal medium even if a semiconductor memory equipped with a copyright protection function used to protect the copyright of the HDD is attached to other devices. This is useful for a device and a medium that perform copyright protection when recording and reproducing data.

1 is a schematic diagram of a recording / reproducing apparatus in Embodiment 1 of the present invention. Flowchart of authentication area division processing in Embodiment 1 of the present invention Configuration of authentication area size and normal area in Embodiment 1 of the present invention

Explanation of symbols

1000 Recording / reproducing apparatus 1100 Central processing unit 1200 Data bus 1300 Host controller 1400 First recording medium (SD card)
1410 Recording medium information 1420 Authentication area 1421 First recording medium authentication area 1422 Second recording medium authentication area 1430 Normal area 1440 Communication control unit 1500 Second recording medium (HDD)
1510 Normal area

Claims (4)

A first recording medium with a copyright protection function;
A second recording medium having no copyright protection function;
The first recording medium includes a plurality of authentication area storage units for storing key data of encrypted content data of the first recording medium and the second recording medium;
In a recording / reproducing apparatus having a card information register unit for storing size information of the authentication area storage unit,
The recording / reproducing apparatus, wherein the size information of the authentication area storage section of the card information register section is the size of the authentication area for the first recording medium. 2. The recording according to claim 1, wherein when performing the initialization process of the second recording medium, the authentication area of the first recording medium corresponding to the second recording medium is initialized. Playback device. The initialization process for the authentication area corresponding to the first recording medium and the normal area for storing normal data are performed when the initialization process for the first recording medium is performed. Item 4. The recording / reproducing apparatus according to Item 1. 2. The recording / reproducing apparatus according to claim 1, wherein the second recording medium is any one of a magnetic recording medium, an optical recording medium, and a semiconductor medium.

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