JP2008067148A - Portable communication terminal, and content management method in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce encrypted contents stored in two or more removable media. <P>SOLUTION: The portable communication terminal 1 comprises: a contents control section 20 for managing contents encryption key information associated with the acquired identification information unique to the removable media 10 wherein encrypted contents are stored; and a contents reproduction section 30 for decrypting contents and reproducing them according to the encryption key information outputted from the contents control section 20 on the basis of the identification information by acquiring the identification information unique to the removable media. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable communication terminal device equipped with a removable medium in which encrypted content is stored, and a content management method in the device.

  Since mobile communication terminal devices such as mobile phones have limited internal memory capacity, portable external devices such as mini-SD (Secure Digital) memory cards can be used for content such as music and video acquired via a network. Saving to a storage device (hereinafter referred to as a removable medium) is performed. Here, it is important to encrypt the content in order to prevent unauthorized copying of the content.

In a mobile communication terminal device, encryption is performed using terminal-specific identification information set for each unique identification number such as a mobile phone number, or data is encrypted and compressed using unique encryption information for each mobile communication terminal device. A common method is to use a memory card having a security function for saving.

In addition to the mobile communication terminal device, many technologies for preventing unauthorized copying of the content described above have been proposed. For example, the image content in the hard disk is compressed and transferred to a removable medium, and then compressed. There is known a content copy management method capable of faithfully reproducing image content while protecting the copyright even when the information is returned to the hard disk (see, for example, Patent Document 1).
JP 2006-107265 A

  However, in the above-described mobile communication terminal device, for example, when content A is downloaded, the content is stored in the removable medium A, and then the content B is downloaded and the content B is stored in the removable medium B, mobile communication Since the encryption key information managed in the terminal device is updated each time, it is not possible to reproduce other than the latest content (content B here). That is, when content is stored in a different removable medium, the key information is also changed, so that the content of the previously stored removable medium cannot be played back.

  The present invention has been made to solve the above-described problems, and provides a portable communication terminal device and a content management method in the device, which can reproduce encrypted content stored in a plurality of removable media. With the goal.

  A portable communication terminal device according to the present invention includes a content management unit that acquires identification information unique to a removable medium in which encrypted content is stored, and manages content encryption key information in association with the identification information. A content reproduction unit that acquires identification information unique to the bubble media and decrypts and reproduces the content according to encryption key information output from the content management unit based on the identification information.

Further, the content management method in the mobile communication terminal device according to the present invention includes a step in which the control device that controls the mobile communication terminal device acquires the content from the outside, and the unique identification information from the removable memory that is the storage destination of the content. A step of acquiring and writing the identification information in a first management table assigned to the storage device, and an encryption key to an index of the second management table assigned to the storage device corresponding to the index of the first management table A step of writing information, and a step of encrypting the acquired content with the encryption key information and storing it on a removable medium.

Further, the content management method in the portable communication terminal device according to the present invention is based on a step in which a control device that controls the portable communication terminal device acquires identification information unique to the removable medium from the removable medium, and the acquired identification information. Searching the first management table assigned to the storage device, obtaining an index to the second management table assigned to the storage device corresponding to the identification information, and a second based on the obtained index And a step of obtaining the encryption key information corresponding to the index, and decrypting the content based on the obtained encryption key information and reproducing the content decrypted by the reproduction device. Is.

  ADVANTAGE OF THE INVENTION According to this invention, the portable communication terminal device which enabled reproduction | regeneration of the encryption content preserve | saved on the several removable media, and the content management method in the same device can be provided.

FIG. 1 is a block diagram showing an internal configuration of a mobile communication terminal apparatus according to an embodiment of the present invention. Here, only constituent blocks directly related to the present invention are extracted and shown.
Here, the mobile communication terminal device 1 includes a removable medium 10, a content management unit 20, and a content playback unit 30.

  The removable medium 10 is composed of, for example, a mini SD and is mounted in a slot formed on the side of the mobile communication terminal device 1. Here, contents such as music and video acquired via the network are encrypted and stored.

  The content management unit 20 has a function of acquiring identification information unique to the removable medium 10 and managing the encryption key information of the content in association with the identification information, and includes a removable media management table 21, an encryption key information management table 22, The content acquisition unit 23, the media identification information management unit 24, the encryption key information management unit 25, and the encrypted content generation unit 26.

The removable media management table 21 is allocated and stored as a first management table in a storage device (for example, a flash memory) of the mobile communication terminal device 1, and the removable media 10 is stored as shown in FIG. Unique identification information (Unique ID) possessed and an index (0 to n) to an encryption key information management table 22 described later are stored and managed in association with each other.
The encryption key information management table 22 is allocated and stored as a second management table in a storage device (for example, a flash memory) of the mobile communication terminal device 1, and is removable as shown in FIG. The index (0-n) of the medium 10 and the content encryption key information (Encrypt Key0-n) are stored and managed in association with each other.

The content acquisition unit 23 acquires user-desired content from the outside via a network or an externally connected PC (personal computer) and outputs the content to the encrypted content generation unit 26.
In addition, the media identification information management unit 24 acquires unique identification information from the removable medium 10 that is the storage destination of the acquired content, and writes it in the removable media management table 21 as the first management table. In addition, the encryption key information management unit 25 generates an encryption key each time an index of the encryption key information management table 22 as the second management table corresponds to the index of the removable media management table 21 as the first management table. Write information. The encrypted content generation unit 26 encrypts the content acquired by the content acquisition unit 23 with the encryption key information managed by the encryption key information management unit 25 and stores the encrypted content in the removable medium 10.

  On the other hand, the content reproduction unit 30 has a function of acquiring identification information unique to the removable medium 10 and decoding and reproducing the content according to encryption key information output from the content management unit 20 based on the identification information. A media identification information acquisition unit 31, a media identification information search unit 32, an encryption key information search unit 33, and a content decryption / reproduction unit 34.

The media identification information acquisition unit 31 acquires identification information unique to the removable medium 10 and outputs the identification information to the media identification information search unit 32 as a first management table search unit. The media identification information search unit 32 searches the removable media management table 21 based on the identification information acquired by the media identification information acquisition unit 31, and acquires an index to the encryption key information management table 22 corresponding to the identification information. Then, the encryption key information search unit 33 as the second management table search unit is activated.
The encryption key information search unit 33 searches the encryption key information management table 22 based on the index acquired by the media identification information search unit 32, acquires the encryption key information corresponding to the index, and delivers it to the content decryption / playback unit 34. The content decryption / playback unit 34 decrypts the content based on the acquired encryption key information and supplies the decrypted content to a playback device (not shown) to play back the content.

 The main control unit 40 is a control center of the mobile communication terminal device 1 of the present invention, and will be described later. The sequence control of each block which comprises the above-mentioned content management part 20 and the content reproduction part 30 is performed.

  Note that the mobile communication terminal device 1 shown in FIG. 1 includes an analog high-frequency portion that manages the transceiver / receiver function inherent to the mobile communication terminal device 1, a communication connection portion with a network such as an IP (Internet Protocol) network, and a camera. The additional function part and the like, and the man-machine interface part related to the user operation / display are not directly related to the present invention, and therefore are not shown.

FIG. 3 is a flowchart for explaining the operation of the mobile communication terminal apparatus according to the embodiment of the present invention. FIG. 3 also shows each step (procedure) of the content management method in the mobile communication terminal device of the present invention.
The operation of the embodiment of the present invention shown in FIGS. 1 and 2 will be described in detail below with reference to the flowchart shown in FIG.

First, the main control unit 40 determines whether the incoming request is a content storage request or a reproduction request (step S301). Here, it is assumed that the content storage request and the content reproduction request are generated when the user operates an input device (not shown).
Here, if it is determined that the request is a content storage request (step S301 "save"), the main control unit 40 activates the content management unit 20, and at this time, the content acquisition unit 23 of the content management unit 20 The content related to the user's desired music or video is downloaded and acquired by transfer from an external device such as a Web (World Wide Web) site managed by the content provider or a PC (not shown) (step S302).

Next, the main control unit 40 controls the media identification information management unit 24 to acquire identification information (media ID: Unique ID 0 to 9 in FIG. 2) that is stored in the removable medium 10 that is the storage destination and is unique to the removable media 10. (Step S303), and writes it in the removable media management table 21 (Step S304).
Subsequently, the main control unit 40 activates the encryption key information management unit 22, and the encryption key information management unit 22 is generated in the index of the key information management table 22 corresponding to the index written in the removable media management table 21. Encryption key information (Encrypt Key 0 to 9) is written (step S305).

Next, the main control unit 40 activates the encrypted content generation unit 26, and the encrypted content generation unit 26 generates the encryption key information generated and output by the encryption key information management unit 25 for the content acquired by the content acquisition unit 23. Encryption is performed based on (Encrypt Key 0 to 9) (step S306), and the encrypted content is stored in the removable medium 10 (step S307).

On the other hand, if it is determined in step S301 that the request is a content reproduction request (step S301 “reproduction”), the main control unit 40 activates the content reproduction unit 30.
At this time, the media identification information acquisition unit 31 of the content playback unit 30 acquires the unique identification information (media ID: Unique ID 0 to 9 in FIG. 2) held by the removable medium 10 and outputs it to the media identification information search unit 32. (Step S308).

Subsequently, the media identification information search unit 32 searches the removable media management table 21 included in the content management unit 20 under the control of the main control unit 40 (step S309), and if a hit is found (step S310 “hit”), The index of the key information management table 22 corresponding to the identification information (Unique ID 0 to 9) acquired by the media identification information acquisition unit 31 is acquired and transferred to the encryption key information search unit 33 (step S310 “hit”).
If the acquired identification information is not written in the removable media management table 21, the process is terminated (Step S310 “Mis Hit”).

Next, the encryption key information search unit 33 searches the encryption key information management table 22 of the content management unit 20 under the control of the main control unit 40 (step S311). If there is a hit (step S312 “hit”), Encryption key information (Encrypt Key 0 to 9) corresponding to the index of the encryption key information management table 22 is acquired and delivered to the content decryption / playback unit 34.
If the index acquired from the media identification information management table 21 is not written in the encryption key information management table 22, the process ends (step S312 “Mis Hit”).

Finally, the content decryption / playback unit 34 decrypts the encrypted content previously stored in the removable medium 10 based on the obtained encryption key information (Encrypt Key 0-9) (step S313), and plays back and outputs (step S31). S314).

As described above, according to the mobile communication terminal device 1 according to the embodiment of the present invention, the unique identification information of the removable medium 10 is used to guarantee the uniqueness of the removable medium 10 and the identification information is included in the identification information. The associated removable media management table 21 and encryption key information management table 22 can guide the encryption key information generated by the mobile communication terminal device 1 when it is stored in the removable medium 10.
Further, by searching the removable media management table 21 and the key information management table 22 described above, it is possible to reproduce the encrypted content stored in the plurality of removable media 10.

In this example, the mini SD is used as the removable medium. However, the SD is not limited to the mini SD, and any medium that can acquire unique information is not limited to the SD (CF) (Compact Flash (registered trademark)). )), MMC (multimedia card), memory card, smart media, memory stick, HDD (hard disk), or the like.

Further, the content management unit 20, the content reproduction unit 30, and the main control unit 40 shown in FIG. 1 are specifically realized by a CPU (control device), a memory (storage device), a peripheral LSI, and the like. By sequentially reading out and executing the program stored in the memory, “at the time of saving the content, the identification information unique to the removable medium 10 is acquired, the encryption key information of the content is managed in association with the identification information, and the content is reproduced. Based on the identification information unique to the removable medium 10, a function of decrypting and reproducing the content according to encryption key information managed in association with the identification information "is realized.
At this time, as the peripheral LSI, a media controller that controls (reads / writes) the removable media 10 asynchronously with the CPU, a playback device that plays back content, or the like can be considered.

It is a block diagram which shows the internal structure of the portable communication terminal device concerning embodiment of this invention. It is a figure which shows an example of the data structure of the management table (Removable media management table 21, Encryption key information management table 22) shown in FIG. It is a flowchart for demonstrating operation | movement of the portable communication terminal device concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Portable communication terminal device, 10 ... Removable media, 20 ... Content management part, 21 ... Removable media management table (1st management table), 22 ... Encryption key information management table (2nd management table), 23 ... Content Acquisition unit 24 ... Media identification information management unit 25 ... Encryption key information management unit 26 ... Encrypted content generation unit 30 ... Content playback unit 31 ... Media identification information acquisition unit 32 ... Media identification information search unit 1 management table search unit), 33 ... encryption key information search unit (second management table search unit), 34 ... content decryption / playback unit, 40 ... main control unit

Claims (6)

A mobile communication terminal device equipped with a removable medium for storing encrypted content,
A content management unit that acquires identification information unique to the removable medium and manages encryption key information of the content in association with the identification information;
A content reproduction unit that acquires identification information unique to the removable medium and decrypts and reproduces the content according to the encryption key information output from the content management unit based on the identification information;
A portable communication terminal device comprising: The content management unit
A first management table for managing the identification information in association with an index to the second management table;
The second management table for managing the index and the encryption key information of the content in association with each other;
The mobile communication terminal device according to claim 1, further comprising: The content management unit
A content acquisition unit for acquiring the content from outside;
A medium identification information management unit that acquires unique identification information from the removable medium serving as a storage destination of the content and writes the unique identification information in the first management table;
An encryption key information management unit for writing the encryption key information to the index of the second management table corresponding to the index of the first management table;
An encrypted content generation unit that encrypts the acquired content with the encryption key information and stores the encrypted content in the removable medium;
The mobile communication terminal device according to claim 1, further comprising: The content playback unit
A medium identification information acquisition unit for acquiring identification information unique to the removable medium;
A first management table search unit that searches the first management table based on the identification information and obtains an index to the second management table corresponding to the identification information;
A second management table search unit for searching the second management table based on the acquired index and acquiring encryption key information corresponding to the index;
A content decryption / playback unit for decrypting and playing back the content based on the acquired encryption key information;
The mobile communication terminal device according to claim 1, further comprising: A content management method in a portable communication terminal device equipped with a removable medium for storing encrypted content and comprising at least a storage device and a control device,
The controller is
Obtaining the content from outside;
Acquiring unique identification information from the removable medium that is the storage destination of the content, and writing the identification information to a first management table allocated to the storage device;
Writing encryption key information into an index of a second management table allocated to the storage device corresponding to the index of the first management table;
Encrypting the acquired content with the encryption key information and storing it in the removable medium; and
A content management method comprising: A content management method in a portable communication terminal device equipped with a removable medium for storing encrypted content and comprising at least a storage device, a control device, and a playback device,
The controller is
Obtaining identification information unique to the removable medium from the removable medium;
A step of searching a first management table allocated to the storage device based on the acquired identification information and acquiring an index to the second management table allocated to the storage device corresponding to the identification information When,
Searching the second management table based on the acquired index, and acquiring encryption key information corresponding to the index;
Decrypting the content based on the acquired encryption key information, and playing back the decrypted content by the playback device;
A content management method comprising:

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