KR20080032555A - Apparatus and method for holding contents in common temporarily among the devices - Google Patents

Abstract

A device and a method for sharing contents temporarily among devices are provided to enable a user to use DRM(Digital Rights Management) contents in various devices of the user in common by enabling one device to transfer or share the DRM contents to other devices placed in a short distance. A proximity checking module(140) determines whether a target device is placed within a proximity distance predetermined based on a right of contents. A right managing module(120) generates and manages the right for temporarily sharing the contents when the target device is placed within the proximity distance. A communicating module(145) transfers the generated right to the target device. The right includes at least one of a reference value for determining the proximity distance and an available playback period of the contents.

Description

Method and apparatus for temporarily sharing content among devices {APPARATUS AND METHOD FOR HOLDING CONTENTS IN COMMON TEMPORARILY AMONG THE DEVICES}

1 is a view showing a process for temporarily sharing a right to play content between devices according to an embodiment of the present invention;

2 is an internal structure diagram of a device according to an embodiment of the present invention;

3 is an exemplary view showing a proximity condition specified in a right according to an embodiment of the present invention;

4 is an exemplary view showing a period condition specified in a right according to an embodiment of the present invention;

5 is an exemplary view showing a proximity distance and a reproducing period condition specified in a right according to an embodiment of the present invention;

6 is an exemplary view showing a proximity distance or a regeneration period condition specified in a right according to an embodiment of the present invention;

7 is an exemplary view showing a grace period specified in a right according to an embodiment of the present invention;

8 is a diagram illustrating an operation of directly transmitting a right from one device to another device according to an embodiment of the present invention;

9 illustrates an operation of indirectly transmitting a right from one device to another device according to an embodiment of the present invention.

The present invention relates to a method for sharing content among devices, and more particularly, to a method and apparatus for temporarily sharing content between devices in a short distance in a digital rights management (DRM) environment.

Currently, various services are available based on technologies for communication methods between near devices such as near field communication (NFC). NFC connects consumer devices to enable fast and easy communication. This communication solution aims to control data in an increasingly complex and increasingly connected world.

As the wireless access technology such as NFC, which enables short-range communication between devices, is developed, various services may be enabled between devices, and contents may be transmitted and shared as an application thereof.

As an example, a method of transmitting or sharing content in a state where devices owned by a user are located in close proximity between users in real life may be considered. However, when a user wants to transmit or share the content to which the protection technology is applied to prevent illegal distribution rather than transmitting or sharing the unprotected content, a content transmission and sharing method based on a separate protection technique is required.

In general, a technology for protecting content is Digital Rights Management (DRM), which is a technology that protects content from illegal distribution and distribution, and ensures safe distribution of paid content through the web and prevents illegal distribution. Was developed for. DRM protects the rights and interests of content providers, prevents illegal copying, and supports the creation, distribution, and management of contents such as charging royalties and payment agents. DRM includes both digital rights management technology, software and security technology for copyright approval and enforcement, payment and payment technology that ensures that only legitimate users use content and pay the appropriate fees. As such, DRM is one of the representative security techniques for protecting content, and defines the encrypted content and the right to use the content.

As described above, in the case of a content to which a protection technique is applied in order to prevent illegal distribution, a separate content transmission or sharing method is required. In particular, in order to transmit or share content to which DRM is applied, a method of transmitting and sharing content based on a DRM protection scheme is required.

Accordingly, the present invention provides a method and apparatus for sharing content among devices based on a DRM protection scheme.

In addition, the present invention provides a method and apparatus for temporarily sharing content between adjacent devices based on a DRM protection scheme.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description will be presented a representative embodiment in the present invention for achieving the above technical problem. Also, for the convenience of description of the present invention, names of entities defined by the Open Mobile Alliance (OMA), which is a standard organization of device applications, will be used. However, these standards and names do not limit the scope of the present invention. Of course, it is applicable to systems having a similar technical background.

The present invention implements a function for sharing content between devices based on a DRM protection scheme. In particular, the device checks whether the devices are within close proximity to each other so as to temporarily share content among devices within close proximity, and if the corresponding close distance corresponds to a predetermined close distance, the device has rights to the content. This gives the permission to enable temporary sharing of the content. In this way, the device to which the right has been transferred has the right to play the content, and thus the content can be commonly used among adjacent devices.

A description will now be given with reference to FIG. 1, which illustrates a process for temporarily sharing a right to play content between devices according to an embodiment of the present invention.

Referring to FIG. 1, first, device 1 20 and device 2 30 determine whether a distance between each other is within a predetermined proximity distance in step 15. That is, mutual authentication with proximity check is performed. If the device 1 20 determines that the mutual authentication with the device 2 30 is successful when it is within a predetermined proximity distance, the device 1 20 transmits a temporary right for content playback to the device 2 30 (temporary rights to play contents).

In these temporary rights, conditions such as proximity, duration, etc. representing a predetermined proximity distance between devices are specified. Therefore, the device 2 30 that has received the temporary right performs content playback based on the temporary right, but stops playing the content if the condition specified in the temporary right is not satisfied. For example, the device 2 30 determines whether the condition indicating the content playable period expires among the conditions in the temporary right, and stops playing the content when the period expires (stop consuming contents if rights are expired). Alternatively, if a device that is within a close distance moves and moves out of the close distance to satisfy a close distance condition with each other, the right to play the content is no longer available and the content playback is stopped. In other words, the authority to play the content disappears when the user moves out of close proximity.

Hereinafter, the components of the device to which the present invention is implemented and the operation thereof will be described with reference to FIG. 2. 2 illustrates an internal structure diagram of the device 1 20 according to an embodiment of the present invention, and the internal structure diagram of the device 2 20 is also the same.

Referring to FIG. 2, the device 1 20 to which the present invention is applied includes an application module 100, a DRM manager module 105, a registration module 110, and an authentication. ) Module 115, Rights Management module 120, Encryption Decryption module 125, Digital Signature module 130, Secure Storage module 135, It includes a proximity check module 140, a communication module 145, and a UIM I / F (Interface) module 150.

In more detail, the application module 100 is a module such as a media player, and serves to receive and reproduce the decoded content from the DRM manager module 105. The DRM manager module 105 manages registration, service subscription, and content use.

The registration module 110 performs an operation according to a device and service provider registration process. The authentication module 115 manages performance of authentication protocols between the user identification module and a network, for example, a Rights Issuer (RI), and uses the lower modules to generate and verify messages. Submodules of the authentication module 115 include an Encryption Decryption module 125 that performs encryption and decryption operations, and a Digital Signature module 130 that digitally signs the content. Responsible for secure decryption and interpretation of content.

The rights management module 120 manages the reproduction of the content according to rights in the device. The secure storage module 135 stores an encryption key and the like, and the communication module 145 is responsible for transmitting and receiving with the network, and in particular, receives a message from the network and transmits a response message corresponding to the received message. It plays a role.

In the following, a case where temporary sharing is started between devices in accordance with an authority in which a condition for a specific distance criterion is specified is described. First, the device having the authority to play the content starts the temporary sharing process when the reference distance it has meets the distance from the counterpart device.

The proximity condition for the temporary sharing may be specified as shown in FIG. 3 in the rights owned by the device 1 (20). 3 is an exemplary view showing a proximity condition specified in a privilege according to an embodiment of the present invention. The proximity condition is expressed as <proximity> XX </ proximity>. A distance value, which is a reference value for determining whether to start sharing, is set. That is, the device having the authority determines whether another device is located within the distance value based on the distance value specified in the authority.

For example, the device 1 20 starts a procedure for temporary sharing when the distance from the device 2 30 is less than or equal to the reference value specified in the authority. Here, the distance measurement with the device 2 (30) and whether or not the device 2 (30) is within the reference value distance is made in the proximity check module 140 of the device 1 (20). If the distance between the device 1 (20) and the device 2 (30) is less than or equal to the reference value specified in the authority, the authority management module 120 of the device 1 (20) generates the authority for temporary sharing to the device 2 (30) To pass.

Meanwhile, after the temporary sharing between the device 1 20 and the device 2 30 is started, the temporary sharing is terminated according to the following method.

First, there is a method of terminating the temporary sharing when the distance between the device 1 (20) and the device 2 (30) is out of the reference value specified in the authority. For example, when the distance between the device 1 (20) and the device 2 (30) is more than the reference value specified in the authority, that is, when the device 2 (30) is out of the predetermined proximity distance authority management module of the device 2 (30) 120 stops using the temporarily shared content. At this time, the proximity check module 140 of the device 2 (30) serves to determine the distance to the device 1 (20). In this case, the reference value specified in the authority may be expressed as shown in FIG. 3.

Second, there is a method of terminating the temporary sharing when the content playable period specified in the authority has passed. That is, temporary sharing is allowed only for a certain time after temporary sharing starts. For example, the device 2 30 determines whether the duration specified in the authority received from the device 1 20 expires, and in particular, the authority management module 120 of the device 2 30 is temporarily shared. If the usage period of the content is longer than the period specified in the authority, the use of the temporary shared content is stopped. Duration in which such content can be played may be specified in the authority as shown in FIG. 4. 4 is an exemplary view showing a period condition specified in a right according to an embodiment of the present invention.

Third, there is a method of terminating temporary sharing only when both the reference value specified in the authority and the content playable period are satisfied. That is, temporary sharing is allowed only when both conditions of a certain distance and period are satisfied after the temporary sharing starts, but temporary sharing is stopped when a situation in which none is satisfied.

For example, the rights management module 120 of the device 2 30 determines whether to keep the temporary sharing according to the distance from the device 1 20 and the content playback period, and the proximity distance specified in the rights is determined. If the playback period is exceeded at the same time out of the state, the use of the temporary shared content is stopped. Such distance and content reproducibility period may be specified in the authority as shown in FIG. 5. 5 is an exemplary diagram showing a proximity distance and a reproducing period condition specified in a right according to an embodiment of the present invention.

Fourth, there is a method of terminating the temporary sharing when either the distance reference value specified in the authority or the content playable period is satisfied. That is, after the temporary sharing is started, the temporary sharing stops when a predetermined proximity distance or a reproduction period expires. For example, the rights management module 120 of the device 2 30 determines whether to keep the temporary sharing according to the distance with the device 1 20 or the content playback period, and the proximity distance specified in the rights is determined. If you leave or exceed the playback period, stop using the temporary shared content. Such distance or content playable period may be specified in the authority as shown in FIG. 6. 6 is an exemplary view showing a proximity distance or a regeneration period condition specified in a right according to an embodiment of the present invention.

As described above, in the present invention, if at least one or more of the proximity distance and the content reproducibility period specified in the authority are satisfied, the temporary sharing of the content is stopped.

However, if the other device is out of close proximity or the playable period expires while the temporary sharing has already been made between the devices, the device that was playing the content may abruptly stop playing the content. There will only be. Accordingly, since the user must bear the inconvenience of stopping the use of the content being played on the way, the present invention proposes the following method to solve this problem. This grace period may be specified in the authorization as shown in FIG. 7 is an exemplary diagram showing a grace period specified in an authority according to an embodiment of the present invention.

First, there is a method of giving a grace time until content reproduction is completed for content currently in use. By doing so, the user who is using the content can use it without interruption. Alternatively, there may be a method of determining a grace time in advance. Accordingly, when the content playable period expires, the grace time is counted so that the user can prepare for the end of the content in advance. In other words, it is possible to prevent the sudden end of the content playback by notifying the user in advance of the end point of the content and ending the content playback only when the grace time expires.

Hereinafter, with reference to FIGS. 8 and 9, the rights transmission is performed between devices for temporary sharing according to an embodiment of the present invention. 8 is a diagram illustrating an operation of directly transmitting a right from one device to another device according to an embodiment of the present invention, and FIG. 9 is an indirect transmission of rights from one device to another device according to an embodiment of the present invention. It is a figure which shows the operation | movement.

First, in FIG. 8, when the device 1 20 receives a right specifying a condition necessary for proceeding temporary sharing from the RI 10, the device 1 20 performs a temporary sharing with the device 2 30 according to the right. To get started. Accordingly, the device 1 20 generates a right for sharing the content and transfers it to the device 2 30. That is, in RI 10, a permission for specifying a condition necessary for temporary sharing is created, and in device 1 20, a permission for content is created based on a permission created in RI 10. In detail, the right for content sharing is generated in the right management module 120 of the device 1 20, and the generated right is transmitted to the device 2 30 through the communication module 145.

Meanwhile, in FIG. 9, once the device 1 20 receives a right specifying a condition necessary for proceeding temporary sharing from the RI 10, the device 1 20 starts a temporary sharing with the device 2 30 according to the right. At this time, the device 1 20 informs the RI 10 of the device 2 30 and the content to be shared. The RI 10 then transmits the authority for sharing and playing the content designated by the device 1 20 to the device 2 30. In this way, the rights required for content reproduction are shared by each device 1 (20) and device 2 (30), and the rights are managed by the rights management module (120) of each device.

On the other hand, the device 1 (20) once informs the RI 10 of the device 2 (30) and the content to be shared only when it is determined that the device 2 (30) is within close proximity. As described above, the message transmitted to the RI 10 includes a content ID to be shared, an ID of the device 2 30, a transmission time, and an electronic signature. Each element constituting such a message is described in detail as follows.

Specifically, the content ID is the ID of the content to be temporarily shared, the ID of the device 2 30 is the ID of the counterpart device performing the temporary sharing, and the TS (Time Stamp) is the RI 10. The transmission time of the message transmitted to the digital signature (Signature) is the electronic signature for the message transmitted to the RI (10). When the RI 10 receives the message having such a component, the RI 10 generates and transmits a corresponding authority required for playing the content.

Meanwhile, conditions for terminating the temporary sharing after the temporary sharing between the device 1 20 and the device 2 30 are started may be applied by the device 1 20 or the device 2 30.

When the authority is directly transmitted between devices as shown in FIG. 8, the authority transmitted to the device 2 30 may include a temporary sharing end condition. In addition, when authority is indirectly transmitted through the RI 10 as shown in FIG. 9, the temporary sharing termination condition may be included in the authority received by the device 2 30 from the RI 10. The device 2 30 receiving such a right may manage the use of the content according to the conditions specified in the right, and then stop using the content according to the temporary sharing end condition. That is, the use of the content may be stopped according to a proximity condition or a content reproduction duration period.

As another method, the device 1 20 may transmit a separate command or message for discontinuing the use of the content to the device 2 30 instead of transmitting the right including the temporary sharing termination condition. If the device 1 20 continuously transmits the content to the device 2 30 as in the streaming method and proceeds with temporary sharing, the device 1 20 has the proximity specified in the rights owned by the device 1 20. Temporary sharing may be stopped by determining whether to stop the content transmission according to conditions such as distance and duration.

According to the present invention as described above, there is an advantage that users can commonly use the DRM applied content in a number of devices owned by them. In addition, according to the present invention, users can transmit or share content in a state in which their own devices are located at a close distance.

Claims (11)

In the method for temporarily sharing content between devices, Determining, by the first device that owns the rights to the content, whether there is a second device within a predetermined proximity distance based on the rights; Generating a right for temporary sharing of the content when the second device is within the proximity distance; And transmitting the generated right to be delivered to the second device. The method of claim 1, wherein the authority At least one condition among a reference value for determining the proximity distance and a playable period of the content is specified. The method of claim 2, Receiving, by the second device, the generated right directly from the first device; Determining, by the second device, whether at least one of the circumstances occurs when the distance with the first device is out of the proximity distance and when the period expires, based on a condition specified in the generated authority; Stopping the temporary sharing of the content when the at least one situation occurs. The method of claim 2, Receiving, by the second device, the generated right directly from the first device; Determining, by the second device, whether a situation occurs when the distance with the first device is out of the proximity distance or when the period expires, based on a condition specified in the generated authority; Stopping the temporary sharing of the content when the one or more situations occur. The method of claim 1, wherein the generating of the right for temporary sharing of the content comprises: Receiving, by the first device, a right necessary to perform temporary content sharing with the second device from a rights issuer; And generating content for sharing content based on the received permission. In the method for temporarily sharing content between devices, Determining, by the first device that owns the rights to the content, whether there is a second device within a predetermined proximity distance based on the rights; Generating and transmitting a message for sharing the content to a right issuer when the second device is within the proximity of the second device; And generating, by the authority issuer, the authority for the temporary sharing of the content based on the message, and transmitting the authority to the second device. The method of claim 6, wherein the right for temporary sharing of content includes: At least one condition among a reference value for determining the proximity distance and a playable period of the content is specified. The method of claim 7, wherein Receiving, by the second device, the generated right from the right issue word; Determining, by the second device, whether at least one of the circumstances occurs when the distance with the first device is out of the proximity distance and when the period expires, based on a condition specified in the generated authority; Stopping the temporary sharing of the content when the at least one situation occurs. The method of claim 7, wherein the second device receives the generated authority from the authority issue word; Determining, by the second device, whether a situation occurs when the distance with the first device is out of the proximity distance or when the period expires, based on a condition specified in the generated authority; Stopping the temporary sharing of the content when the one or more situations occur. An apparatus for temporarily sharing content between devices, the apparatus comprising: A proximity check module that determines whether there is a counterpart device within a predetermined proximity distance based on the authority to the content; A rights management module for generating and managing rights for temporary sharing of the content when the counterpart device is within the proximity distance; And a communication module for transmitting the generated right to be delivered to the counterpart device. The method of claim 10, wherein the authority And at least one condition among a reference value for determining the proximity distance and a playable period of the content is specified.

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