JP2007328635A - Content distribution system, mobile terminal, content distribution server, and content distribution method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a content to be distributed to a terminal for using the content only when a mobile terminal exists near the terminal for using the content. <P>SOLUTION: A content distribution method includes: a step S13 wherein a mobile terminal 20 generates terminal information including respective terminal identifiers of a content using terminal 30 and the mobile terminal 20 and transmits a registration request message for requesting registration of the terminal information to a content distribution server 10 when the distance between the content using terminal 30 and the mobile terminal 20 becomes a certain distance or shorter; a step S14 wherein the content distribution server 10 registers the terminal information in response to reception of the registration request message; and a step S17 wherein the content distribution server 10 determines whether the terminal information has been registered or not in response to reception from the content using terminal 30 of a distribution request message for requesting distribution of a content and distributes the content to the content using terminal 30 in accordance with the determination result. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to content copyright management technology, and more particularly, to a content distribution system, a mobile terminal, a content distribution server, and a content distribution method for distributing content to a content use terminal that uses the content.

  Since digital content is intangible, unlike tangibles such as industrial products and foods, it has the feature that it is easy to duplicate the same quality. The copyright law prohibits copying of content unless the permission of the creator is obtained, but in practice it is often illegally copied and used. Proper protection of the copyright of the content is extremely important for content creators, and the demand is high. Against this background, recently, DRM (Digital Rights Management), which is a copyright management technology for digital contents, has attracted attention. Initially, DRM technology applied to music CDs, DVD movies, digital broadcasts, etc. attracted attention, but in recent years, content provided for mobile terminals has become diversified and expensive, and is applied to mobile terminals. DRM technology is also attracting attention.

  Against this background, OMA (Open Mobile Alliance), a standard organization for mobile application elemental technologies, has standardized OMA DRM, which is DRM technology for mobile terminals. OMA DRM is intended to protect any content distributed to mobile terminals, and not only allows copying of content protected by copyright law, but also limits on content usage (number of times used, expiration date, etc.) ) Can also be instructed. In addition, OMA DRM has various functions that meet the demands of content providers, such as a super-distribution function that promotes the distribution of digital contents by separating digital contents and rights information.

  OMA DRM is a simple OMA DRM version 1.0 (DRMv1.0) (for example, see Non-Patent Document 1) mainly targeting low-priced content and an advanced OMA DRM version mainly targeting high-priced content. There are two types, 2.0 (DRMv2.0) (see Non-Patent Document 2, for example). In OMA DRM version 2.0, in addition to file-type data such as ringtones and wallpaper, it is possible to perform copyright management for streaming distribution data such as music and video. Furthermore, OMA DRM version 2.0 introduced the concept that content acquired on a mobile terminal can be used (reproduced) in other peripheral devices (music player, video player, etc.) by introducing a domain function. .

  In addition, a number of problems have arisen when various contents such as music and moving images can be used on mobile terminals due to recent technological advances. For example, if a terminal that can use content (hereinafter referred to as a “content using terminal”) is misplaced or stolen, and the content using terminal is passed to another user, the content is used by another user. There was a problem.

Therefore, if the content use terminal leaves the owner or the user due to misplacement or theft, the content use terminal becomes unusable and can be used to warn that the content use terminal has been separated by a certain distance or more. Has been proposed (see, for example, Patent Document 1). By using this technology, it is possible to limit the use of content in a mobile terminal that receives content such as moving images and music.
Open Mobile Alliance, “OMA Digital Rights Management Enabler Release,” Approved Version 1.0, OMA-DRM-V1_0-20040615-A, June 2004, www.openmobilealliancs.org Open Mobile Alliance, “OMA Digital Rights Management Enabler Release,” Candidate Version 2.0, OMA-ERP-DRM-V2_0-20060303-A, March 2006, www.openmobilealliance.org Japanese Patent No. 293276

  By combining the two technologies described above, it is possible to further strengthen restrictions on the use of content. For example, if the use restriction device described above is mounted on a portable terminal and the use of content in a peripheral device such as a music player or DVD player as a content use terminal is restricted, the use restriction (number of times) of the content by OMA DRM In addition to the time limit, the content can be used only when the mobile terminal is physically close to the content use terminal.

  However, even if the content cannot be used, there is a problem that the content can be distributed from the content distribution server to the content using terminal, and the content is stored in the content using terminal. It does not matter if the content usage terminal has a tamper-resistant structure, but if the content can be taken out from the content usage terminal, the content is illegally used by a malicious user. There is.

  In view of the above problems, the present invention provides a content distribution system, a mobile terminal, a content distribution server, and a content distribution method capable of distributing content to a content use terminal only when the mobile terminal exists near the content use terminal The purpose is to provide.

  In order to achieve the above object, a first feature of the present invention is a content comprising a content use terminal that uses content, a content distribution server that delivers content to the content use terminal, and a mobile terminal that manages the content use terminal. In the distribution system, the mobile terminal generates terminal information including terminal identifiers of the content use terminal and the self terminal when the distance between the content use terminal and the self terminal is within a certain range. A registration request message for requesting registration of information, a registration request unit for transmitting to the content distribution server, and a deletion request message for requesting deletion of terminal information registered in the content distribution server when the distance exceeds a certain value, A deletion request unit that transmits to the content distribution server, and the content distribution server sends a registration request message Whether or not the terminal information is registered in the terminal information registration unit when a terminal information registration unit for registering terminal information and a distribution request message for requesting content distribution are received from the content use terminal. A content distribution unit that distributes content to the content usage terminal according to the determination result, and the terminal that is registered in the terminal information registration unit when the deletion request message is received, thereby deleting the content usage terminal The gist of the present invention is a content distribution system including a distribution control unit that stops distribution of content to the network.

  According to this feature, the content distribution server can distribute the content in response to the distribution request message from the content use terminal only when the distance between the content use terminal and the portable terminal is within a certain distance. Therefore, when the distance between the content use terminal and the portable terminal exceeds a certain distance, the distribution request message from the content use terminal is not permitted, and the content use terminal cannot receive the content. As a result, even if the content use terminal is misplaced or stolen, the content use terminal cannot receive the content, and unauthorized use by a malicious user can be prevented.

  According to a second feature of the present invention, in the content distribution system according to the first feature, when the terminal information is updated, the mobile terminal transmits an update request message for requesting the terminal information update to the content distribution server. The update control unit is further provided, and the distribution control unit updates the terminal information registered in the terminal information registration unit in response to the update request message.

  According to this feature, even when the terminal information is updated, the mobile terminal transmits an update request message for requesting the update of the terminal information to the content distribution server, so it is possible to cope with the update of the terminal information. It becomes.

  According to a third aspect of the present invention, in the content distribution system according to the first or second aspect, the terminal information further includes an encryption key shared between the mobile terminal and the content use terminal, and the content distribution unit The gist is to encrypt the content using a key and distribute the encrypted content to the content use terminal.

  According to this feature, by encrypting content using an encryption key shared between the mobile terminal and the content using terminal, the encrypted content can be used only on the mobile terminal and the content using terminal. It is possible to further strengthen the copyright protection of the content.

  A fourth feature of the present invention is a mobile terminal used together with a content use terminal that uses content and a content distribution server that delivers content to the content use terminal, and the distance between the content use terminal and the terminal itself is small. A registration request unit that generates terminal information including the terminal identifiers of the content use terminal and the own terminal, and transmits a registration request message for requesting registration of the terminal information to the content distribution server, when it is within a certain range; The gist is that the portable terminal includes a deletion request unit that transmits a deletion request message for requesting deletion of terminal information registered in the content distribution server to the content distribution server when the distance exceeds a certain value.

  According to a fifth aspect of the present invention, in the mobile terminal according to the fourth aspect, when the terminal information is updated, an update request message for requesting the update of the terminal information registered in the content distribution server is sent to the content distribution server. The gist of the present invention is to further include an update request unit to be transmitted to the server.

  A sixth feature of the present invention is a content distribution server used together with a content use terminal that uses content and a mobile terminal that manages the content use terminal, and includes a terminal that includes the respective terminal identifiers of the content use terminal and the mobile terminal When a registration request message for requesting registration of information is received from a mobile terminal, when a terminal information registration unit for registering terminal information and a distribution request message for requesting distribution of content are received from a content use terminal, It is determined whether or not the terminal information is registered in the terminal information registration unit, and a content distribution unit that distributes the content to the content using terminal according to the determination result, and a deletion request message that requests deletion of the terminal information, Content information by deleting the terminal information registered in the terminal information registration unit. And summarized in that a delivery of content to the user terminal a content distribution server and a distribution control unit to stop.

  According to a seventh feature of the present invention, in the content delivery server according to the sixth feature, the delivery control unit receives the update request message for requesting the update of the terminal information from the mobile terminal, and sends it to the terminal information registration unit. The gist is to update the registered terminal information.

  According to an eighth aspect of the present invention, in the content distribution server according to the sixth or seventh aspect, the terminal information further includes an encryption key shared between the mobile terminal and the content using terminal, and the content distribution unit includes the encryption The gist is to encrypt the content using a key and distribute the encrypted content to the content use terminal.

  A ninth feature of the present invention is a content distribution used in a content distribution system including a content use terminal that uses content, a content distribution server that distributes content to the content use terminal, and a mobile terminal that manages the content use terminal. When the distance between the content using terminal and the self terminal is within a certain range, the mobile terminal generates terminal information including the terminal identifiers of the content using terminal and the self terminal, and the terminal information Transmitting a registration request message for requesting registration to the content distribution server; registering terminal information when the content distribution server receives the registration request message; and distributing the content by the content distribution server The requested delivery request message was received from the content usage terminal If the distance between the mobile terminal and the mobile terminal exceeds a certain distance, the terminal information registered is determined whether or not the terminal information is registered and the content is distributed to the content use terminal according to the determination result. And a step of transmitting a deletion request message for requesting deletion of the content to the content distribution server, and when the content distribution server receives the deletion request message, the registered terminal information is deleted, so that the content to the content use terminal The content distribution method includes the step of stopping the distribution.

  According to the present invention, it is possible to provide a content distribution system, a mobile terminal, a content distribution server, and a content distribution method that can distribute content to a content use terminal only when the mobile terminal exists near the content use terminal.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings in the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

(System configuration)
As shown in FIG. 1A, the content distribution system according to the embodiment of the present invention includes a content distribution server 10, a portable terminal 20, and a content use terminal 30. The content distribution server 10, the portable terminal 20, and the content use terminal 30 include hardware resources such as a CPU, a storage device, and an input / output device, and software resources stored in the storage device.

  The content use terminal 30 can communicate with the content distribution server 10 via the communication network 40, and can acquire the content created by the content distribution server 10. As the content use terminal 30, for example, a terminal that can use content such as audio or moving images such as a music player, a DVD player, or a portable TV player can be used.

  The mobile terminal 20 communicates directly with the content use terminal 30 to manage the content use terminal 30 and communicates with the content distribution server 10 via the communication network 40. As the mobile terminal 20, for example, a mobile phone or a PDA having a wireless communication function can be used. When the mobile terminal 20 has a configuration in which content can be used, the mobile terminal 20 may receive content from the content distribution server 10 as with the content use terminal 30.

  The content distribution server 10 can communicate with the mobile terminal 20 and the content use terminal 30 via the communication network 40, and distributes the content to the content use terminal 30 via the communication network 40.

  The content using terminal 30 periodically transmits a radio wave for transmitting a terminal identifier for identifying the terminal 30 at a constant intensity, and the portable terminal 20 measures the intensity. Since the distance between the mobile terminal 20 and the content use terminal 30 and the radio wave intensity measured by the mobile terminal 20 have a correlation, the mobile terminal 20 is connected between the content use terminal 30 and the own terminal 20. The distance between them can be measured.

  The mobile terminal 20 periodically monitors whether or not the distance between the content use terminal 30 and the own terminal 20 is within a certain range, and the distance between the content use terminal 30 and the own terminal 20 is within a certain range. In some cases, a pairing process for managing the content use terminal 30 is executed.

  Specifically, the mobile terminal 20 is 1) that the content use terminal 30 is a management target of itself (hereinafter referred to as “pairing start”), and 2) the content use terminal 30 is out of its management target. (Hereinafter referred to as “pairing end”), and 3) it is possible to detect that the state of the content use terminal 30 has been updated (hereinafter referred to as “pairing state update”).

  Note that the portable terminal 20 also periodically transmits radio waves for transmitting a terminal identifier for identifying the terminal 20 itself. Here, the portable terminal 20 transmits radio waves at a constant intensity, and the content use terminal 30 measures the intensity, so that the content use terminal 30 can also measure the distance from the portable terminal 20. Therefore, a function that restricts the use (playback) of content on the content use terminal 30 according to the distance from the mobile terminal 20 may be added to the content use terminal 30. Such a technique is disclosed in Patent Document 1, for example. In the following, an example of adding a function that restricts the use of content to the content use terminal 30 will be described.

(Overview of operation)
Next, an operation outline of the content distribution system shown in FIG. 1A will be described with reference to the sequence diagram shown in FIG. However, description will be made assuming that the content use terminal 30 leaves the user of the mobile terminal 20 due to misplacement or theft of the content use terminal 30 while the content delivery server 10 is delivering the content to the content use terminal 30. .

  In step S11, the mobile terminal 20 determines that the distance between the mobile terminal 20 and the content use terminal 30 is within a certain range, and executes a pairing start process. “Pairing start processing” means that the content use terminal 30 is a management target of the mobile terminal 20, so that an identifier can be exchanged for uniquely identifying each other terminal, and can be shared between the mobile terminal 20 and the content use terminal 30 Means a process for generating a simple encryption key (hereinafter referred to as “pairing key”). The pairing key is a secret key used for encrypting communication between the portable terminal 20 and the content using terminal 30 while the pairing state is maintained. For example, a Diffie-Hellman key exchange method or a patent It is generated by Document 1 and its accompanying technology.

  In step S <b> 12, the mobile terminal 20 generates terminal information including the terminal identifiers of the content use terminal 30 and the own terminal 20. As shown in FIG. 6, the terminal information includes the terminal identifier of the mobile terminal 20 and the terminal identifier of the content use terminal 30 managed by the mobile terminal 20 as main components. Further, the terminal information includes a pairing key created by the pairing start process between the mobile terminal 20 and the content use terminal 30, and attached information such as a pairing validity period.

  In step S <b> 13, the mobile terminal 20 transmits a registration request message for requesting registration of terminal information to the content distribution server 10. The registration request message includes the terminal information generated in step S12.

  In step S14, the content distribution server 10 registers the terminal information transmitted from the portable terminal 20 in step S13. As a result, the terminal information shown in FIG. 6 is stored in the content distribution server 10.

  In step S <b> 15, the content use terminal 30 transmits a distribution request message for requesting content distribution to the content distribution server 10. The distribution request message includes, for example, the respective terminal identifiers of the content use terminal 30 and the mobile terminal 20. However, the distribution request message only needs to include at least the terminal identifier of the content use terminal 30, and the terminal identifier of the mobile terminal 20 is not essential. By adding the terminal identifier of the mobile terminal 20 to the distribution request message, the content distribution server 10 can easily refer to the terminal information using the terminal identifier of the mobile terminal 20.

  In step S16, the content distribution server 10 determines (authenticates) whether the terminal identifiers of the content use terminal 30 and the mobile terminal 20 notified in step S15 are registered as terminal information. When the terminal identifiers of the content use terminal 30 and the portable terminal 20 notified in step S15 are registered, the content distribution server 10 distributes the content to the content use terminal 30 in step S17.

  In step S <b> 18, the mobile terminal 20 determines that the distance between the content use terminal 30 and the terminal 20 has exceeded a certain level, and cancels the pairing. For example, when the radio wave intensity received by the mobile terminal 20 is lower than a predetermined intensity because the distance between the mobile terminal 20 and the content use terminal 30 is separated, the distance between the content use terminal 30 and the own terminal 20 Is determined to have exceeded a certain level and it is determined that pairing has been resolved.

  In step S <b> 19, the mobile terminal 20 transmits a deletion request message for requesting deletion of the terminal information registered in the content distribution server 10 to the content distribution server 10. Note that the deletion request message includes, for example, the terminal identifiers of the mobile terminal 20 and the content use terminal 30, respectively.

  In step S20, the content distribution server 10 deletes the terminal information including the terminal identifiers of the content use terminal 30 and the mobile terminal 20 notified in step S19. When the terminal information is deleted, it indicates that the pairing between the mobile terminal 20 and the content use terminal 30 has been released. For this reason, the content distribution server 10 stops the content distribution to the content use terminal 30 in step S21. This operation makes it impossible for the content use terminal 30 to receive the content.

  Thus, the content distribution server 10 permits the distribution request message from the content use terminal 30 only when the distance between the content use terminal 30 and the portable terminal 20 is within a certain distance. That is, the content use terminal 30 can receive content from the content distribution server 10 only when the mobile terminal 20 exists near the content use terminal 30. As a result, if the content use terminal 30 is misplaced or stolen, and the user moves away from the user of the mobile terminal 20, the content distribution server 10 can stop the distribution of the content to the content use terminal 30.

(Content distribution server configuration)
Next, a functional configuration example of the content distribution server 10 is shown in FIG. The content distribution server 10 includes a communication unit 101, a distribution control unit 102, a terminal information registration unit 103, a content distribution unit 104, and a content storage unit 105.

  The communication unit 101 communicates with the mobile terminal 20 and the content use terminal 30. The content storage unit 105 registers the terminal information transmitted from the mobile terminal 20.

  The content distribution unit 104 has a function of managing content stored in the content storage unit 105 and distributing content to the content use terminal 30. Specifically, when a distribution request message for requesting distribution of content is received from the content use terminal 30 via the communication unit 101, it is determined whether or not the terminal information is registered in the terminal information registration unit 103. The content is distributed to the content use terminal 30 according to the determination result.

  The distribution control unit 102 manages terminal information registered in the terminal information registration unit 103. Specifically, when the distribution control unit 102 receives an update request message for requesting update of the terminal information registered in the terminal information registration unit 103 from the mobile terminal 20 via the communication unit 101, the terminal information registration is performed. The terminal information registered in the unit 103 is updated. If the terminal information is updated while the content is being distributed to the content use terminal 30, the content distribution unit 104 continues to distribute the content based on the terminal information.

  Further, when receiving a deletion request message from the mobile terminal 20 via the communication unit 101, the distribution control unit 102 deletes the terminal information registered in the terminal information registration unit 103, and stores the content to the content use terminal 30. Stop delivery.

(Configuration of mobile device)
Next, a functional configuration example of the mobile terminal 20 is shown in FIG. The mobile terminal 20 includes a communication unit 201, a use restriction unit 202, and a control unit 203. The communication unit 201 communicates with the content distribution server 10 and the content use terminal 30. The use restriction unit 202 performs the use restriction described above for the content use terminal 30.

  The use restriction unit 202 performs pairing processing and periodically monitors the radio wave intensity received from the content use terminal 30 through the communication unit 201, and performs pairing between the content use terminal 30 and the portable terminal 20. Periodically determine whether or not In addition, when the pairing is canceled, the use restriction unit 202 performs a procedure such as deleting the pairing key used in each terminal.

  The control unit 203 includes a registration request unit 213, an update request unit 223, and a deletion request unit 233.

  When the distance between the content use terminal 30 and the mobile terminal 20 is within a certain range, the registration request unit 213 generates terminal information including the respective terminal identifiers of the content use terminal 30 and the mobile terminal 20, and the terminal information A registration request message for requesting registration is transmitted to the content distribution server 10 via the communication unit 201.

  When the terminal information is updated, the update request unit 223 transmits an update request message for requesting update of the terminal information registered in the content distribution server 10 to the content distribution server 10 via the communication unit 201.

  When the distance between the content use terminal 30 and the portable terminal 20 exceeds a certain value, the deletion request unit 233 sends a deletion request message requesting deletion of the terminal information registered in the content distribution server 10 to the communication unit 201. To the content distribution server 10.

(Content terminal configuration)
Next, a functional configuration example of the content use terminal 30 is shown in FIG. The content use terminal 30 includes a communication unit 301, a usage restriction unit 302, a content control unit 303, and a content storage unit 304.

  The communication unit 301 communicates with the content distribution server 10 and the mobile terminal 20. In the content storage unit 304, content distributed by the content distribution server 10 is stored. The content control unit 303 controls the content acquired from the content distribution server 10 and controls to use the content stored in the content storage unit 304.

  As described above, the use restriction unit 302 individually stops various applications and functions that operate on the content use terminal 30 when the distance between the mobile terminal 20 and the content use terminal 30 exceeds a certain distance. .

(Operation procedure for mobile devices)
Next, the operation procedure of the mobile terminal 20 will be described using the flowchart shown in FIG.

  In step S <b> 101, the control unit 203 determines whether any event of pairing start, pairing state update, or pairing end has been received from the use restriction unit 202. If any event of pairing start, pairing state update, or pairing end is received, the process proceeds to step S102.

  In step S102, the control unit 203 determines the type of event received in step S101. When the event received in step S101 is pairing start, the process proceeds to step S103.

  When the event received in step S101 is pairing state update, the process proceeds to step S104. As an example of the pairing state update, the pairing key can be updated. The pairing key shared between the mobile terminal 20 and the content use terminal 30 is periodically updated.

  When the event received in step S101 is the end of pairing, the process proceeds to step S105. As an example of the end of pairing, a case where the content use terminal 30 is separated from the mobile terminal 20 can be considered.

  In step S103, the registration request unit 213 generates terminal information to be transmitted to the content distribution server 10, and transmits a registration request message including the terminal information to the content distribution server 10 in step S106.

  In step S104, the update request unit 223 updates the terminal information to be transmitted to the content distribution server 10. In step S107, the update request unit 223 transmits an update request message including the updated terminal information to the content distribution server 10.

  In step S105, the deletion request unit 233 generates terminal information for requesting the content distribution server 10 to delete, and in step S108, a deletion request message including terminal information to be deleted is sent to the content distribution server 10. To send.

  Through the above operation, the mobile terminal 20 appropriately transmits the pairing state with the content use terminal 30 to the content distribution server 10.

(Contents distribution server terminal information management procedure)
Next, the terminal information management procedure in the content distribution server 10 will be described using the flowchart shown in FIG. When the content distribution server 10 receives various messages from the mobile terminal 20, the content distribution server 10 performs an operation according to the following.

  In step S <b> 201, the distribution control unit 102 determines whether any one of a registration request message, an update request message, or a deletion request message has been received from the mobile terminal 20 through the communication unit 101. When any one of the registration request message, the update request message, or the deletion request message is received, the process proceeds to step S202.

  In step S202, the distribution control unit 102 determines the type of message received in step S201. If the message received in step S201 is a registration request message, the process proceeds to step S203. In step S <b> 203, the distribution control unit 102 registers terminal information in the terminal information registration unit 103.

  When the message received in step S201 is an update request message, the process proceeds to step S204. In step S <b> 204, the distribution control unit 102 updates the terminal information stored in the terminal information registration unit 103.

  If the message received in step S201 is a deletion request message, the process proceeds to step S205. In step S205, the distribution control unit 102 deletes the terminal information stored in the terminal information registration unit 103.

  When the distribution control unit 102 performs registration of terminal information (step S203), update of terminal information (step S204), and deletion of terminal information (step S205) by the above operation, the result is returned to the portable terminal in step S206. In order to notify 20, a response message is created and transmitted to the mobile terminal 20.

  Through the above operation, the content distribution server 10 manages the pairing state (state information) between the content use terminal 30 and the mobile terminal 20.

(Content delivery server content delivery procedure)
Below, the content delivery procedure in the content delivery server 10 is demonstrated using the flowchart shown in FIG.

  In step S <b> 301, the content distribution unit 104 regularly monitors the communication unit 101 and determines whether a distribution request message has been received from the content use terminal 30. When the distribution request message is received from the content use terminal 30, the process proceeds to step S302.

  In step S <b> 302, the content distribution unit 104 confirms whether or not the terminal information regarding the terminal identifiers of the content use terminal 30 and the mobile terminal 20 included in the distribution request message is stored in the terminal information registration unit 103. When the terminal information regarding the terminal identifiers of the content use terminal 30 and the mobile terminal 20 included in the distribution request message is stored in the terminal information registration unit 103, the process proceeds to step S303.

  In step S303, the content distribution unit 104 distributes the content by any one of the following distribution methods 1 to 3.

(Distribution method 1)
The content distribution unit 104 transmits the content stored in the content storage unit 105 to the content usage terminal 30 as a distribution destination as it is. As for the distribution method, distribution is performed by the distribution method requested by the content use terminal 30 to the content distribution server 10.

  For example, when the content use terminal 30 desires streaming delivery using RTP (Real-Time Transport Protocol) or the like, the content delivery server 10 delivers the content to the content use terminal 30 using the protocol. To do.

  When the content use terminal 30 desires to distribute file-type content using HTTP (Hypertext Transfer Protocol) or SMTP (Simple Message Transfer Protocol), the content distribution server 10 uses the protocol to Content is distributed to the use terminal 30.

(Distribution method 2)
The content distribution unit 104 encrypts the content stored in the content storage unit 105 and transmits the content to the distribution destination content use terminal 30. As for the distribution method, the distribution method designated by the content use terminal 30 is used in the same manner as in Method 1.

  For content encryption, an encryption key or the like may be determined between the content distribution server 10 and the content use terminal 30, and the content may be encrypted using the encryption key. Alternatively, the content may be encrypted using a pairing key included in the terminal information. By encrypting the content using the pairing key, the content can be used only in the mobile terminal 20 and the content using terminal 30 that hold the pairing key. Strengthening is possible.

(Distribution method 3)
Distribution method 3 is an example in the case where the present invention is applied to a content distribution method that separates content and its right information as in OMA DRM.

  The content distribution unit 104 extracts rights information (Rights Object) to be distributed to the content use terminal 30 from the content storage unit 105 and transmits the right information to the content use terminal 30. As a transmission method of the right information, a transmission method defined by OMA DRM can be used.

  The content distribution unit 104 may encrypt the extracted right information using a pairing key. By encrypting the rights information using the pairing key, the rights information can be used only by the mobile terminal 20 and the content using terminal 30 that hold the pairing key, so that the copyright protection of the content can be protected. Further enhancement is possible. Since the pairing key is shared only by the portable terminal 20 and the content using terminal 30 in the vicinity thereof, it can be used as a method for realizing the domain function of OMA DRM.

  In the distribution methods 1 to 3 described above, when the terminal information of the content use terminal 30 is updated, the content distribution unit 104 processes the content distributed to the content use terminal 30 according to the distribution methods 1 to 3 described above. To change. For example, in the case of updating terminal information that involves updating a pairing key, the content distribution unit 104 updates the pairing key used for content encryption and distributes the content. As a result, even when the pairing state between the mobile terminal 20 and the content use terminal 30 is changed (in this case, the pairing key is updated), the content is also delivered to the content use terminal 30 accordingly. Content processing is possible.

(Other embodiments)
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the above-described embodiment, it has been described that the distribution request message transmitted from the content use terminal 30 does not need to include the terminal identifier of the mobile terminal 20. However, in the distribution methods 2 and 3 described above, the terminal identifier of the mobile terminal 20 is used as a distribution request in order for the content distribution server 10 to determine which mobile terminal and content using terminal pair to select as a pairing key. It is preferably included in the message.

  For example, in the embodiment described above, the use restriction unit 202 of the mobile terminal 20 warns that the content use terminal 30 has been separated by a certain distance or more by, for example, sounding a buzzer, as in Patent Document 1. Also good.

  Further, an example has been described in which the mobile terminal 20 and the content use terminal 30 periodically transmit radio waves with a constant intensity. However, the configuration is not limited to radio waves, and for example, an ultrasonic wave or the like may be periodically transmitted.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

FIG. 1A is an overall configuration diagram of a content distribution system according to an embodiment of the present invention, and FIG. 1B is a sequence diagram showing an operation outline of the content distribution system according to the embodiment of the present invention. It is a figure which shows the structural example of the terminal information which concerns on embodiment of this invention. It is a block diagram which shows the function structural example of the content delivery server which concerns on embodiment of this invention. It is a block diagram which shows the function structural example of the portable terminal which concerns on embodiment of this invention. It is a block diagram which shows the function structural example of the content utilization terminal which concerns on embodiment of this invention. It is a flowchart which shows the operation | movement procedure of the portable terminal which concerns on embodiment of this invention. It is a flowchart which shows the operation | movement procedure of the content delivery server which concerns on embodiment of this invention. It is a flowchart which shows the content delivery procedure of the content delivery server which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Content distribution server 20 ... Portable terminal 30 ... Content utilization terminal 40 ... Communication network 101 ... Communication part 102 ... Distribution control part 103 ... Terminal information registration part 104 ... Content distribution part 105 ... Content storage part 201 ... Communication part 202 ... Use Restriction unit 203 ... Control unit 213 ... Registration request unit 223 ... Update request unit 233 ... Deletion request unit 301 ... Communication unit 302 ... Usage restriction unit 303 ... Content control unit 304 ... Content storage unit

Claims (9)

A content delivery system comprising a content use terminal that uses content, a content delivery server that delivers content to the content use terminal, and a mobile terminal that manages the content use terminal,
The portable terminal is
Registration that generates terminal information including terminal identifiers of the content use terminal and the self terminal when the distance between the content use terminal and the self terminal is within a certain range, and requests registration of the terminal information. A registration request part for transmitting a request message to the content distribution server;
A deletion request unit that transmits a deletion request message for requesting deletion of terminal information registered in the content distribution server to the content distribution server when the distance exceeds a certain amount,
The content distribution server is
A terminal information registration unit for registering the terminal information when the registration request message is received;
When a distribution request message for requesting distribution of content is received from the content using terminal, it is determined whether or not the terminal information is registered in the terminal information registration unit, and the content using terminal is determined according to the determination result. A content distribution unit that distributes content to
A delivery control unit that stops delivery of the content to the content use terminal by deleting the terminal information registered in the terminal information registration unit when the deletion request message is received. Content distribution system. The mobile terminal further includes an update request unit that transmits an update request message for requesting the update of the terminal information to the content distribution server when the terminal information is updated.
The content distribution system according to claim 1, wherein the distribution control unit updates terminal information registered in the terminal information registration unit in response to the update request message. The terminal information further includes an encryption key shared between the mobile terminal and the content using terminal,
The content distribution system according to claim 1, wherein the content distribution unit encrypts the content using the encryption key, and distributes the encrypted content to the content use terminal. A content use terminal that uses content and a mobile terminal that is used together with a content delivery server that delivers content to the content use terminal,
Registration that generates terminal information including terminal identifiers of the content using terminal and the own terminal and requests registration of the terminal information when the distance between the content using terminal and the own terminal is within a certain range. A registration request part for transmitting a request message to the content distribution server;
A portable terminal comprising: a deletion request unit that transmits, to the content distribution server, a deletion request message that requests deletion of terminal information registered in the content distribution server when the distance exceeds a certain distance. .   An update request unit that transmits, to the content distribution server, an update request message that requests an update of the terminal information registered in the content distribution server when the terminal information is updated. Item 5. The mobile terminal according to Item 4. A content distribution server used together with a content use terminal that uses content and a mobile terminal that manages the content use terminal,
A terminal information registration unit for registering the terminal information when a registration request message for requesting registration of terminal information including terminal identifiers of the content use terminal and the mobile terminal is received from the mobile terminal;
When a distribution request message for requesting distribution of content is received from the content using terminal, it is determined whether or not the terminal information is registered in the terminal information registration unit, and the content using terminal is determined according to the determination result. A content distribution unit that distributes content to
When a deletion request message for requesting deletion of the terminal information is received from the mobile terminal, the distribution of content to the content using terminal is stopped by deleting the terminal information registered in the terminal information registration unit A content distribution server comprising: a distribution control unit for performing   The distribution control unit updates the terminal information registered in the terminal information registration unit when receiving an update request message for requesting an update of the terminal information from the portable terminal. Content distribution server described in 1. The terminal information further includes an encryption key shared between the mobile terminal and the content using terminal,
The content distribution server according to claim 6 or 7, wherein the content distribution unit encrypts the content using the encryption key, and distributes the encrypted content to the content use terminal. A content distribution method used in a content distribution system including a content use terminal that uses content, a content distribution server that distributes content to the content use terminal, and a mobile terminal that manages the content use terminal,
The mobile terminal generates terminal information including terminal identifiers of the content using terminal and the self terminal when the distance between the content using terminal and the self terminal is within a certain range, Transmitting a registration request message for requesting registration to the content distribution server;
When the content distribution server receives the registration request message, registering the terminal information;
When the content distribution server receives a distribution request message for requesting distribution of content from the content use terminal, it determines whether the terminal information is registered, and the content use terminal according to the determination result Delivering content to
A step of transmitting a deletion request message requesting deletion of the registered terminal information to the content distribution server when the mobile terminal exceeds a certain distance;
The content distribution server includes the step of, when receiving the deletion request message, deleting the registered terminal information to stop the distribution of the content to the content using terminal. Delivery method.

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