JP2007019688A - Content transfer method and content transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide "a content transfer method and a content transfer system" that can transfer contents such as music data held in an in-vehicle device to the other in-vehicle device by a proper method. <P>SOLUTION: For the system wherein the first in-vehicle device holding the contents and the second in-vehicle device are connected to each other through a relay means to communicate with each other, the method for content transfer includes a step of transferring specified identification information from the second in-vehicle device to the first in-vehicle device, a step of enciphering a content deciphering key for deciphering the held contents in the first in-vehicle device by using the specified identification information, a step of transferring the enciphered content deciphering key to the second in-vehicle device, and a step of deciphering the enciphered content deciphering key in the second in-vehicle device. The specified identification information may be an open key generated in the second in-vehicle device or the identification number of the second in-vehicle device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a content transfer method and content transfer system for transferring ripped and stored content, and more particularly to a content transfer method and content transfer system for transferring content stored in an in-vehicle device memory.

  In recent years, it has become common to mount a player such as a CD (Compact Disc) or a DVD (Digital Versatile Disc) on which music is recorded in a vehicle and enjoy the music by playing the CD while driving.

  In addition to playing back an existing music CD, the music CD contents (contents) are collected from your favorite songs and songs of your favorite artist, stored in a memory (for example, hard disk), and music from the hard disk. It is also done to search for and play.

  There is a method of ripping music CD content as a method of copying and recording such music playback CD content on another information recording medium capable of high-speed search such as a hard disk device. Ripping is extracting digital format data recorded on a music CD, converting it into a file format that can be processed by a PC (Personal Computer), and storing it.

  In addition to offline information as described above, opportunities to purchase digitized music data using the Internet are increasing.

For example, in Patent Document 1, music data with unnatural sound quality is acquired as a sample using the Internet, and then music data is reproduced with high quality using a content key received by a person who purchased the music data. A method is disclosed. It is also conceivable to rip the music data acquired in this way and store it in the memory of the in-vehicle device.
JP 2000-339852 A

  As described above, music CD content is ripped and stored on a hard disk or the like, but such a one-generation copy (copy) of a music CD has no legal problem.

  However, it is basically prohibited to copy the contents of the music CD ripped and stored in the memory of the in-vehicle device to the memory of another in-vehicle device. That is, copy protection technology based on the SCMS (Serial Copy Management System) standard is added to the digital recording device, and copying by digital connection is possible only for one generation. Further, existing copyright protection standards such as Windows-DRM (Digital Rights Management) cannot handle ripped content, and cannot protect the copyright of such content.

  Therefore, content such as a music CD stored in the memory of the in-vehicle device by ripping cannot be used in another in-vehicle device. For this reason, conventionally, when a new in-vehicle device is purchased, necessary data must be ripped from a music CD or the like to a hard disk. At this time, it takes a lot of time and effort to save all the music data stored in the old in-vehicle device, which is a heavy burden on the user.

  In Patent Document 1, the content key is acquired to improve the music data, but the low-quality music data at the time the sample is acquired is not copied to another device, so the disclosed method The above problem cannot be solved.

  The present invention has been made in view of the problems of the prior art, and provides a content transfer method and a content transfer system that can legally transfer content such as music data held in an in-vehicle device to another in-vehicle device. The purpose is to do.

  In order to solve the above-described problems of the prior art, according to an aspect of the present invention, in a system in which a first in-vehicle device and a second in-vehicle device having content are communicably connected via a relay unit. , Transferring predetermined identification information from the second in-vehicle device to the first in-vehicle device, and decrypting the content held in the first in-vehicle device using the predetermined identification information Encrypting a content decryption key for use, transferring the encrypted content decryption key to the second vehicle-mounted device, and encrypting the content decryption key in the second vehicle-mounted device A content transfer method comprising: a step of decrypting the content.

  In the content transfer method according to the above aspect, the predetermined identification information includes a public key created in the second vehicle-mounted device, an identification number of the second vehicle-mounted device, or the first and second vehicle-mounted devices prepared in advance. May be information indicating any of the identification numbers shared.

  In the content transfer method according to this embodiment, a public key is created on the new in-vehicle device (second on-vehicle device) side, and a content decryption key for decrypting content using this public key is assigned to the old in-vehicle device ( The first in-vehicle device) encrypts the data. Then, the encrypted content decryption key is transferred to the new in-vehicle device, and the content decryption key is decrypted by the new in-vehicle device. Thereby, the content encrypted using the content decryption key can be decrypted.

  In this way, ripped and accumulated data can be transferred and restored to the new in-vehicle device without infringing on the copyright, and the convenience of the user is improved by eliminating the trouble of newly saving the data. .

  Further, in the content transfer method according to the above aspect, instead of the step of transferring the encrypted content decryption key to the second in-vehicle device, the step of transferring the encrypted content decryption key to the relay means Encrypting license information with the predetermined identification information in the first in-vehicle device, erasing the content decryption key, and transferring the encrypted license information to the relay means And a step in which the relay means transfers the encrypted content decryption key and the encrypted license information to the second vehicle-mounted device, and a step of decrypting the license information in the second vehicle-mounted device. May be included.

  In the information transfer method according to this aspect, the encrypted content key and the encrypted license information are transferred to the relay device. This license information includes information obtained by deleting the content key with the old in-vehicle device. Thereafter, the encrypted content key and license information are transferred to a new in-vehicle device.

  Thereby, it can be determined whether or not the content key can be decrypted on the new in-vehicle device side. In addition, since it is not necessary to determine whether or not the relay device may decrypt the content key, a bridge medium such as a flash memory or a removable HDD can be used as the relay device.

  Moreover, according to the other form of this invention, the content transfer system which implements the content transfer method which concerns on said form is provided. A content transfer system according to one embodiment includes a first in-vehicle device that holds content, a second in-vehicle device, and a relay unit that relays the first and second in-vehicle devices so that they can communicate with each other. The first in-vehicle device encrypts a content decryption key for decrypting the content obtained by encrypting the content by using predetermined identification information received from the second in-vehicle device. Means, content encryption means for encrypting the content ripped from the content recording medium, content decryption key is encrypted based on an instruction from the relay means, and the encrypted content decryption key is transferred to the relay means And the second vehicle-mounted device decrypts the encrypted content decryption key and the identification information acquisition unit that generates or acquires predetermined identification information. Receiving the encrypted content decryption key from the relay means, decrypting the content decryption key, and decrypting the content decryption key Control means for decrypting the encrypted content using the content decryption key thus obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
(Content transfer system configuration)
FIG. 1 shows a configuration of a content transfer system 100 according to an embodiment of the present invention.

  The content transfer system 100 according to the present embodiment includes an old in-vehicle device 1, a new in-vehicle device 2, and a relay device 3 that relays information between the both in-vehicle devices.

  The old vehicle-mounted device 1 includes a content encryption unit 5 that encrypts data obtained by ripping a part of the content of the music CD 4, a storage unit 7 such as an HDD that stores the content of the encrypted music CD, and license information. A flash memory 6 to be stored, a license information and a content decryption key (a key for decrypting the encrypted content), an encryption / decryption unit 8 for decrypting the encrypted content, An input / output unit 9 that transmits and receives signals to and from the relay device 3 and a control unit 10 that includes a microcomputer that controls these units are included.

  On the other hand, the new in-vehicle device 2 includes a storage unit 15 for storing music CD content, an encrypted content decryption key and an encryption / decryption unit 12 for decrypting the encrypted content, and a content decryption key. An identification information acquisition unit 14 that generates or acquires identification information for encrypting the information, an input / output unit 11 that transmits and receives signals to and from the relay device 3, and a control unit 16 that includes a microcomputer that controls these units. It is comprised including.

  In addition, the relay device 3 stores the input / output unit 17 connected to the input / output unit 9 of the old in-vehicle device 1 and the input / output unit 11 of the new in-vehicle device 2, and key information transferred from the old in-vehicle device 1. And a control unit 18 including a display unit 20 that displays an information transfer state and a microcomputer that controls these units.

  In the content transfer system 100 configured as described above, data obtained by ripping a part of the content of the music CD 4 is encrypted by the content encryption unit 5 and stored in the storage unit 7. The encrypted content is transferred from the storage unit 7 of the old in-vehicle device 1 to the storage unit 15 of the new in-vehicle device 2 by a normal method. The content decryption key is encrypted in the encryption / decryption unit 8. This encryption is based on information (for example, public key) generated or acquired by the identification information acquisition unit 14 of the new in-vehicle device 2. This information is transmitted from the new in-vehicle device 2 to the old in-vehicle device 1 via the relay device 3. The key encrypted by the encryption / decryption unit 8 is transferred to the new in-vehicle device 2 via the relay device 3. When the control unit 16 of the new vehicle-mounted device 2 determines that the transferred key can be decrypted, it decrypts the encrypted key. Then, the content of the encrypted music CD stored in the storage unit 15 is decrypted using the decrypted key.

  In this way, the ripped music CD content can be transferred to a new in-vehicle device. Thereby, the user can save the trouble of newly ripping music data, and the convenience of the user can be improved.

(Content transfer method)
Hereinafter, a content transfer method performed by the content transfer system 100 according to the present embodiment will be described with reference to FIG. 2 showing an example of the state transition flow.

  First, a content movement mode for moving content is activated on the old in-vehicle device 1 side. A signal indicating that the content movement mode has been activated is transferred to the relay device 3 and transferred from the relay device 3 to the new in-vehicle device 2. On the new in-vehicle device 2 side, a content acceptance mode for accepting content is activated. A signal indicating that the content acceptance mode has been activated is transferred to the relay device 3, and the control unit 18 of the relay device 3 determines that the movement and acceptance of the content have been activated in the old in-vehicle device 1 and the new in-vehicle device 2. Establish a communication path for in-vehicle devices. Here, for example, a PC (personal computer) is used as the relay device 3. Further, it is assumed that both the old in-vehicle device 1 and the new in-vehicle device 2 have an interface for connecting to a PC.

  Next, a public key is created in the new in-vehicle device 2. This public key is created based on the ID of the new in-vehicle device 2, for example. After creating the public key, it is transferred to the relay device 3. The relay device 3 that has received the public key transfers the public key to the old in-vehicle device 1.

  Next, the old in-vehicle device 1 encrypts the content decryption key for decrypting the content using the received public key. Here, it is assumed that the content decryption key is created in advance by the old vehicle-mounted device 1 by an arbitrary method.

  The encrypted content decryption key is transferred to the relay device 3. The relay device 3 stores the transferred content decryption key in the storage unit 19.

  Next, in the in-vehicle device 1, the license information (for example, copy prohibition flag) related to the music CD to be transferred is encrypted and stored in the flash memory 6 using the transferred public key, and then the content decryption key is used. to erase. The license information includes information obtained by deleting the content decryption key in the old in-vehicle device 1. Thereafter, the encrypted license information is transferred to the relay device 3.

  Next, the relay device 3 transfers the encrypted content decryption key and the encrypted license information to the new in-vehicle device 2. In the new in-vehicle device 2, the license information is stored in the flash memory 13.

  Next, the new in-vehicle device 2 decrypts the license information and confirms the validity of the license information. That is, it is determined whether or not the content decryption key has been deleted in the old in-vehicle device 1. If the content decryption key has been erased, only the new in-vehicle device 2 can decrypt the ripped and encrypted music CD content, and the same content can be played back by other in-vehicle devices. The problem can be avoided. After determining that the content decryption key has been deleted in the old in-vehicle device 1, the content decryption key is decrypted and stored in the storage unit 15.

  Next, the new vehicle-mounted device 2 notifies the relay device 3 that acquisition of the content decryption key has been completed. The relay device 3 that has received the notification displays on the display unit 20 that the content transfer has been completed, and ends the processing.

  As described above, in the content transfer method according to the present embodiment, a key for decrypting encrypted content data is encrypted by the old in-vehicle device based on the information of the new in-vehicle device, and the encrypted key is It is transferred to the new in-vehicle device. The new in-vehicle device decrypts the encrypted key and decrypts the content using this key. By performing such processing, the ripped music data can be transferred to another in-vehicle device. Thereby, the user can save the trouble of newly ripping music data, and the convenience of the user can be improved.

  In the present embodiment, the PC is used as the relay device 3. However, the present invention is not limited to the PC, and if a port for connecting a flash memory or the like is prepared in the in-vehicle device, such a bridge medium may be used. Is possible. In this case, after the new in-vehicle device 2 decrypts the content decryption key and stores it in the storage unit 15, the encrypted content decryption key, license information, and public key stored in the bridge medium are deleted. To finish the content transfer process.

(Second Embodiment)
The configuration of the content transfer system 100 in the second embodiment is the same as the configuration described in the first embodiment. Regarding the content transfer method, in the first embodiment, the public key is created in the new in-vehicle device 2 and the content decryption key is encrypted by the public key method. In the second embodiment, the content decryption key is used. This is different from the first embodiment in that encryption / decryption is performed using the same key.

(Content transfer method)
Hereinafter, the content transfer method according to the second embodiment will be described with reference to the state transition flowchart of FIG.

  In this embodiment, it is assumed that a common ID is assigned in advance to both the old in-vehicle device 1 and the new in-vehicle device 2. This common ID is, for example, an arbitrary number or character combination having a 16-byte length, as shown in FIG. These ID groups are assigned at the time of production of the in-vehicle device, and about 10 ID groups are stored in the flash memory (6, 13) built in the in-vehicle device.

  First, it authenticates whether the old vehicle equipment 1 and the new vehicle equipment 2 are the company's products. Authentication is performed as follows.

First, the nth ID information (ID _n ) stored in the memory from the new in-vehicle device 2 is transferred to the old in-vehicle device 1 via the relay device 3. Here, the relay device 3 may be, for example, a general-purpose PC or a dedicated device for information transfer.

Next, transfer the old on-board unit 1 ID _n received it is determined whether the flash memory 6 of the old on-board device 1, the next ID information ID _n if (ID n + ₁₎ to the new on-board unit 2 To do.

Next, it is determined whether or not the ID _{n + 1} received by the new in-vehicle device 2 is in the flash memory 13 of the new in-vehicle device 2, and if so, the authentication between the old in-vehicle device 1 and the new in-vehicle device 2 has been completed. Become.

Next, the new vehicle-mounted device 2 transmits _{n + 2nd} ID information (ID _{n + 2} ) to the old vehicle-mounted device 1.

Next, the old vehicle-mounted device 1 that has received the ID _{n + 2} encrypts the content decryption key using an n + 3rd ID information (ID _{n + 3} ) by an arbitrary method. Here, it is assumed that the content decryption key is created in advance by the old vehicle-mounted device 1 by an arbitrary method.

  Next, the encrypted content decryption key is transferred to the new in-vehicle device 2 via the relay device 3. When the new in-vehicle device 2 transmits a reception confirmation signal to the relay device 3, the relay device 3 transmits an instruction signal for erasing the content decryption key to the old in-vehicle device 1.

When the old in-vehicle device 1 erases the content decryption key and transmits an erasure completion notification to the relay device, the relay device 3 transmits a signal instructing the new in-vehicle device 2 to decrypt the encrypted content decryption key. . Thereafter, the new in-vehicle device 2 decrypts the encrypted content decryption key using ID _{n + 3} , and transmits a decryption completion notification to the relay device 3.

  The movement of the key for decrypting the content is completed by executing the above-described series of processes, and the relay device 3 displays on the display unit 20 that the movement has been completed.

  Thereafter, using the content decryption key, the encrypted content can be decrypted to listen to music or the like.

  As described above, in the content transfer method according to the present embodiment, an encrypted key is encrypted by using one ID among ID groups to which a key for decrypting encrypted content is assigned in advance. Is transferred to the new in-vehicle device 2. By performing such processing, the ripped music data can be transferred to the new in-vehicle device 2. Thereby, the user can save the trouble of newly ripping music data, and the convenience of the user can be improved.

  In the present embodiment, since an ID that is a key used for encryption and decryption is assigned in advance, it is not necessary to generate a new key in the new in-vehicle device 2. Moreover, since the same key is used in the encryption performed in the old vehicle-mounted device 1 and the decryption performed in the new vehicle-mounted device 2, there is an advantage that the processing time for encryption and decryption is shortened.

(Modification)
In the second embodiment, signal transmission is started from the new in-vehicle device 2 in order to perform authentication between the old in-vehicle device 1 and the new in-vehicle device 2. In this modification, signal transmission is started from the old vehicle-mounted device 1. In the second embodiment, an ID is prepared in advance, but in this modification, an ID unique to the in-vehicle device is used.

  Hereinafter, a content transfer method according to this modification will be described with reference to the state transition flowchart of FIG.

  First, an authentication is performed between the old in-vehicle device 1 and the new in-vehicle device 2 as to whether it is a company product. This authentication is performed as follows.

  First, the ID number of the old in-vehicle device 1 is transmitted from the old in-vehicle device 1 to the new in-vehicle device 2 via the relay device 3. The control unit 16 of the new in-vehicle device 2 determines whether or not the transmitted ID number belongs to the company, and if so, the ID number of the new in-vehicle device 2 passes through the relay device 3. It transmits to the old vehicle equipment 1.

  Next, the old in-vehicle device 1 converts the ID number of the new in-vehicle device 2 received by the encryption / decryption unit 8 with a certain logic, and encrypts the content decryption key using the converted ID number.

  Next, as in the second embodiment, the encrypted content decryption key is transmitted to the new in-vehicle device 2 via the relay device 3, and after the old in-vehicle device 1 erases the content decryption key, the relay is performed. The device 3 transmits an instruction to decrypt the content decryption key to the new in-vehicle device 2.

  Next, in the new in-vehicle device 2, the encryption / decryption unit 12 converts the ID of the new in-vehicle device 2 with a certain logic. This constant logic uses the same logic as the logic obtained by converting the ID number of the new in-vehicle device 2 in the old in-vehicle device 1. The encrypted content decryption key is decrypted using the converted ID.

  As described above, in the content transfer method according to the present modification, the key for decrypting the encrypted content is encrypted based on the ID of the new vehicle-mounted device 2, and the encrypted key is transferred to the new vehicle-mounted device. 2 is transferred. By performing such processing, the ripped music data can be transferred to the new in-vehicle device 2. Thereby, the user can save the trouble of newly ripping music data, and the convenience of the user can be improved.

  Further, since the ID number of the in-vehicle device is used for the authentication between the two in-vehicle devices, the signal for authentication needs to be transmitted only once from each in-vehicle device, and the second embodiment described above (see FIG. 3). ), The authentication process can be performed more efficiently.

(Third embodiment)
FIG. 6 shows the configuration of a content transfer system 200 according to the third embodiment of the present invention. The content transfer system 200 according to the present embodiment is composed of the old in-vehicle device 1 and the new in-vehicle device 2, and the first and second embodiments are different in that there is no relay device that relays information between these both in-vehicle devices. This is different from the content transfer system 100. Accordingly, in FIG. 6, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the content transfer system 200, data obtained by ripping a part of the content of the music CD 4 is encrypted by the content encryption unit 5 and stored in the storage unit 7. The encrypted content is transferred from the storage unit 7 of the old in-vehicle device 1 to the storage unit 15 of the new in-vehicle device 2 by a normal method. The content decryption key is encrypted in the encryption / decryption unit 8. This encryption is based on information generated or acquired by the identification information acquisition unit 14 of the new in-vehicle device 2. This information is directly transmitted from the new in-vehicle device 2 to the old in-vehicle device 1. The key encrypted by the encryption / decryption unit 8 is directly transmitted from the old in-vehicle device 1 to the new in-vehicle device 2. When it is determined that the transferred key can be decrypted, the control unit 16 of the new vehicle-mounted device 2 decrypts the encrypted key. Then, the content of the encrypted music CD stored in the storage unit 15 is decrypted using the decrypted key.

  In this way, it is possible to transfer the ripped music CD content to a new in-vehicle device. Furthermore, since the information related to the content decryption key for decrypting the content is directly transmitted and received between the old in-vehicle device 1 and the new in-vehicle device 2, the content transfer process is simpler than when the content is transferred via a relay device. As a result, the processing time can be shortened.

(Content transfer method)
Hereinafter, a content transfer method performed by the content transfer system 200 according to the present embodiment will be described with reference to FIG. 7 showing an example of the state transition flow.

  First, a content movement mode for moving content on the old in-vehicle device 1 side is activated. A signal indicating that the content movement mode has been activated is transmitted to the new in-vehicle device 2 via the input / output unit 9 and the input / output unit 11. In the new vehicle-mounted device 2, a content acceptance mode for accepting content is activated. A signal indicating that the content acceptance mode has been activated is transmitted to the old in-vehicle device 1 via the input / output unit 11 and the input / output unit 9, and a communication path is established between the old in-vehicle device 1 and the new in-vehicle device 2.

  Next, a public key is created in the new in-vehicle device 2. This public key is created based on the ID of the new in-vehicle device 2, for example. After creating the public key, it is transferred to the old in-vehicle device 1.

  Next, the content decryption key for decrypting the content is encrypted using the public key received in the old in-vehicle device 1 and transferred to the new in-vehicle device 2.

  Next, the license information related to the music CD to be transferred is encrypted using the transferred public key, the content decryption key is deleted, and then the encrypted license information is transferred to the new in-vehicle device 2.

  Next, the new in-vehicle device 2 decrypts the license information, confirms that the content decryption key has been erased in the old in-vehicle device 1, and decrypts the encrypted content decryption key.

  As described above, the content transfer method according to the present embodiment can achieve the same effects as those of the content transfer method according to the first embodiment.

  Furthermore, since the information related to the content decryption key is directly transmitted and received between the old in-vehicle device 1 and the new in-vehicle device 2, the content transfer process is simplified compared to the case where the relay device is used, and the processing time is reduced. It can be shortened.

(Modification 1)
Hereinafter, the content transfer method according to the first modification will be described with reference to the state transition flowchart of FIG.

  In this modification, as described in the second embodiment, it is assumed that a common ID (see FIG. 4) is assigned to both the old in-vehicle device 1 and the new in-vehicle device 2 in advance.

  First, it authenticates whether the old vehicle equipment 1 and the new vehicle equipment 2 are the company's products.

First, the n-th ID information (ID _n ) stored in the flash memory 13 is directly transmitted from the new in-vehicle device 2 to the old in-vehicle device 1.

Next, the old in-vehicle device 1 determines whether or not the received ID _n is in the flash memory 6 of the old in-vehicle device 1, and if there is, ID information (ID _{n + 1} ) next to ID _n is sent to the new in-vehicle device 2. Send directly.

Next, it is determined whether or not the ID _{n + 1} received by the new in-vehicle device 2 is in the flash memory 13 of the new in-vehicle device 2, and if so, the authentication between the old in-vehicle device 1 and the new in-vehicle device 2 has been performed. become.

Next, the new in-vehicle device 2 transmits the ( _{n + 2} ) th ID information (ID _{n + 2} ) to the old in-vehicle device 1.

Next, the old vehicle-mounted device 1 encrypts the content decryption key created in advance using the ( _{n + 3} ) th ID information (ID _{n + 3} ).

  Next, the encrypted content decryption key is directly transmitted to the new in-vehicle device 2. When the new vehicle-mounted device 2 receives the content decryption key, the new vehicle-mounted device 2 transmits an instruction signal for deleting the content decryption key to the old vehicle-mounted device 1.

  Next, when the old in-vehicle device 1 deletes the content decryption key, the old in-vehicle device 1 transmits a signal instructing the new in-vehicle device 2 to decrypt the content decryption key.

Thereafter, the new vehicle-mounted device 2 decrypts the encrypted content decryption key using ID _{n + 3} . Then, it is possible to decrypt the encrypted content using the content decryption key and listen to music or the like.

  As described above, also in the content transfer method according to this modification, the same effect as that of the content transfer method according to the second embodiment can be obtained.

  Furthermore, since the information related to the content decryption key is directly transmitted and received between the old in-vehicle device 1 and the new in-vehicle device 2, the content transfer process is simplified compared to the case where the relay device is used, and the processing time is reduced. It can be shortened.

(Modification 2)
Hereinafter, the content transfer method according to the second modification will be described with reference to the state transition flowchart of FIG.

  First, authentication is performed between the old in-vehicle device 1 and the new in-vehicle device 2 as to whether or not the product is a company product.

  First, the ID number of the old in-vehicle device 1 is transmitted directly from the old in-vehicle device 1 to the new in-vehicle device 2. The control unit 16 of the new in-vehicle device 2 determines whether or not the transmitted ID number belongs to the company, and if it belongs to the company, transmits the ID number of the new in-vehicle device 2 directly to the old in-vehicle device 1.

  Next, in the old in-vehicle device 1, the encryption / decryption unit 8 converts the received ID number of the new in-vehicle device 2 with a certain logic, and encrypts the content decryption key using the converted ID number.

  Next, the encrypted content decryption key is directly transmitted to the new in-vehicle device 2. When the new vehicle-mounted device 2 receives the content decryption key, the new vehicle-mounted device 2 transmits an instruction signal for deleting the content decryption key to the old vehicle-mounted device 1.

  Next, after the old in-vehicle device 1 erases the content decryption key, the old in-vehicle device 1 transmits a signal instructing the new in-vehicle device 2 to decrypt the content decryption key.

  Thereafter, the new in-vehicle device 2 uses the encryption / decryption unit 12 to convert the ID of the new in-vehicle device 2 with a certain logic, and decrypts the encrypted content decryption key using the converted ID.

  As described above, also in the content transfer method according to this modification, it is possible to obtain the same effect as the content transfer method according to the modification of the second embodiment.

  Furthermore, since the information related to the content decryption key is directly transmitted and received between the old in-vehicle device 1 and the new in-vehicle device 2, the content transfer process is simplified compared to the case where the relay device is used, and the processing time is reduced. It can be shortened.

It is a block diagram which shows the structure of the content transfer system which concerns on the 1st Embodiment of this invention. It is a state transition flowchart which shows an example of the content transfer process which concerns on 1st Embodiment. It is a state transition flowchart which shows an example of the content transfer process which concerns on 2nd Embodiment. It is a figure which shows an example of a common ID group. It is a state transition flowchart which shows an example of the content transfer process which concerns on the modification of 2nd Embodiment. It is a block diagram which shows the structure of the content transfer system which concerns on the 3rd Embodiment of this invention. It is a state transition flow figure showing an example of content transfer processing concerning a 3rd embodiment. It is a state transition flow figure showing an example of content transfer processing concerning modification 1 of a 3rd embodiment. It is a state transition flowchart which shows an example of the content transfer process which concerns on the modification 2 of 3rd Embodiment.

Explanation of symbols

1 ... Old in-vehicle device (first in-vehicle device),
2 ... New in-vehicle device (second in-vehicle device),
3 ... Relay device (relay means),
4 ... Music CD,
5 ... Content encryption unit,
6, 13 ... flash memory,
7 ... Memory part,
8: Encryption / decryption unit (encryption key creation means),
9, 11 ... Input / output unit,
10, 16 ... control unit,
12: Encryption / decryption unit (key decryption means),
14 ... identification information acquisition unit (identification information acquisition means),
15: Storage section (storage means).

Claims (12)

In the system in which the first in-vehicle device and the second in-vehicle device possessing the content are communicably connected via the relay unit,
Transferring predetermined identification information from the second vehicle-mounted device to the first vehicle-mounted device;
Encrypting a content decryption key for decrypting the stored content using the predetermined identification information in the first vehicle-mounted device;
Transferring the encrypted content decryption key to the second in-vehicle device;
And a step of decrypting the encrypted content decryption key in the second in-vehicle device.   The predetermined identification information is one of a public key created in the second vehicle-mounted device, an identification number of the second vehicle-mounted device, or an identification number shared by the first and second vehicle-mounted devices prepared in advance. The content transfer method according to claim 1, wherein the information is instruction information. Instead of transferring the encrypted content decryption key to the second in-vehicle device,
Transferring the encrypted content decryption key to the relay means;
Encrypting license information with the predetermined identification information in the first vehicle-mounted device;
Erasing the content decryption key;
Transferring the encrypted license information to the relay means;
The relay means transferring the encrypted content decryption key and the encrypted license information to the second in-vehicle device;
The content transfer method according to claim 1, further comprising: decrypting license information in the second in-vehicle device. Between the step of transferring the encrypted content decryption key to the second in-vehicle device and the step of decrypting the content decryption key,
Transmitting a reception confirmation signal for confirming that the second vehicle-mounted device has received the encrypted content decryption key to the relay unit;
After the reception confirmation signal is received, the relay means instructs the first in-vehicle device to delete the content decryption key;
After the first vehicle-mounted device receives an instruction to erase the content decryption key, erases the content decryption key and notifies the relay means of the completion of the erase;
The relay unit includes a step of instructing the second in-vehicle device to decrypt the encrypted content decryption key after receiving the notification of the completion of erasure. The content transfer method described.   The content transfer method according to any one of claims 1 to 4, wherein the relay unit is a personal computer or a bridge medium. A first in-vehicle device having content, a second in-vehicle device, and a relay means for relaying the first and second in-vehicle devices so as to communicate with each other;
The first in-vehicle device is:
An encryption key generating means for encrypting a content decryption key for decrypting the content obtained by encrypting the content using the predetermined identification information received from the second in-vehicle device;
Content encryption means for encrypting the ripped content from the content recording medium;
Control means for encrypting a content decryption key based on an instruction from the relay means, and transferring the encrypted content decryption key to the relay means;
The second in-vehicle device is
Identification information acquisition means for generating or acquiring predetermined identification information;
Key decryption means for decrypting the encrypted content decryption key;
Storage means for storing the encrypted content;
Receiving the encrypted content decryption key from the relay means, decrypting the content decryption key, and decrypting the encrypted content using the decrypted content decryption key And a content transfer system.   The predetermined identification information is either a public key created in the second vehicle-mounted device, an identification number of the second vehicle-mounted device, or an identification number shared by the first and second vehicle-mounted devices prepared in advance. The content transfer system according to claim 6, wherein the content transfer system is information to be instructed.   8. The content transfer system according to claim 6, wherein the relay unit is a personal computer or a bridge medium. In the system in which the first in-vehicle device and the second in-vehicle device possessing the content are connected to be communicable,
Transferring predetermined identification information from the second vehicle-mounted device to the first vehicle-mounted device;
Encrypting a content decryption key for decrypting the stored content using the predetermined identification information in the first vehicle-mounted device;
Transferring the encrypted content decryption key to the second in-vehicle device;
And a step of decrypting the encrypted content decryption key in the second in-vehicle device.   The predetermined identification information is one of a public key created in the second vehicle-mounted device, an identification number of the second vehicle-mounted device, or an identification number shared by the first and second vehicle-mounted devices prepared in advance. The content transfer method according to claim 9, wherein the information is instruction information. A first in-vehicle device having content and a second in-vehicle device capable of communicating with the first in-vehicle device;
The first in-vehicle device is:
An encryption key generating means for encrypting a content decryption key for decrypting the content obtained by encrypting the content using the predetermined identification information received from the second in-vehicle device;
Content encryption means for encrypting the ripped content from the content recording medium;
Control means for encrypting a content decryption key based on an instruction from the second onboard device and transferring the encrypted content decryption key to the second onboard device;
The second in-vehicle device is
Identification information acquisition means for generating or acquiring predetermined identification information;
Key decryption means for decrypting the encrypted content decryption key;
Storage means for storing the encrypted content;
The encrypted content decryption key is received from the first vehicle-mounted device, the content decryption key is decrypted, and the encrypted content is decrypted using the decrypted content decryption key. A content transfer system comprising a control means for decoding.   The predetermined identification information is either a public key created in the second vehicle-mounted device, an identification number of the second vehicle-mounted device, or an identification number shared by the first and second vehicle-mounted devices prepared in advance. The content transfer system according to claim 11, wherein the content transfer system is an instruction information.

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