KR101302560B1 - Apparatus, system and method for sharing digital contents between devices - Google Patents

Abstract

The present invention relates to a device for sharing digital content, a system, and a method of sharing between devices, and more particularly, to a technology for sharing digital content encrypted by DRM among playback devices regardless of DRM. To this end, by using a digital content sharing device included in a first device that reproduces encrypted digital content, a digital content sharing system between devices that can reproduce the encrypted digital content of the first device in the second device, The digital content sharing module included in the device includes a receiving unit for receiving the encrypted digital content, a decryption unit for decrypting the encrypted digital content, and inserting a fingerprint in the decrypted digital content based on the leakage path tracking information. And a fingerprint printing unit for storing the digital content, and a transmission unit for transmitting the fingerprint-embedded digital content to the second device.

Encryption, DRM, Digital, Content, Device, Share, Fingerprinting

Description

Apparatus, system and method for sharing digital contents between devices}

The present invention relates to a device for sharing digital content, a system, and a method of sharing between devices, and more particularly, to a technology for sharing digital content encrypted by DRM among playback devices regardless of DRM.

The present invention is derived from a study conducted as part of the cultural contents industry technical support project of the Ministry of Culture, Sports and Tourism and the Korea Creative Content Agency. [Task management number: 2-09-1205-001-10987-09-001, Assignment name: DCI Development of technology for digital cinema distribution management and copyright protection that conforms to the standard].

As piracy of digital contents increases gradually, various encryption techniques are used as a method for protecting copyrights of digital contents. For example, DRM (Digital Rights Management) technology is one of the technologies widely used to protect the copyright of digital content. Only users or devices with the right to use the content can play the content, and other users or devices can prevent the illegal distribution of the content by preventing the content.

However, anyone who purchases and uses DRM-applied content legitimately can play the content on his / her other device. However, due to the closedness of the DRM, playback is not possible except for the device at the time of purchasing the content, which causes a lot of inconvenience to the user. In addition, if a device to be played is provided with another DRM, content becomes more difficult to play.

In order to solve such inconveniences, mutually compatible technologies and interworking technologies between DRMs have been introduced, and in the music contents, a method of providing music contents without DRM such as DRM free has appeared. However, there is still a problem of copyright protection when providing services such as music contents without DRM.

The present invention is created from the above problems, an object of the present invention is to solve the user inconvenience caused by the closedness of the DRM, share the DRM applied digital content between various devices, to prevent illegal distribution of digital content To provide an apparatus, system, and method for the same.

The object of the present invention as described above, by using a digital content sharing device included in the first device for playing encrypted digital content, digital content between devices that can reproduce the encrypted digital content of the first device in the second device As a sharing system, the digital content sharing module included in the first device includes:

Receiving unit for receiving the encrypted digital content, Decryption unit for decrypting the encrypted digital content, and inserting the fingerprint to the decrypted digital content based on the leakage path tracking information, and stores the digital content embedded with the fingerprint It can be achieved by a digital content sharing system between devices including a fingerprint printing unit and a transmission unit for transmitting the fingerprint-inserted digital content to the second device.

In addition, the object of the present invention as described above, as an apparatus for sharing digital content so that encrypted digital content can be played on different playback devices,

Decryption module that receives and decrypts encrypted digital content and converts the decrypted digital content to the codec or resolution of the content playback device, and converts the digital content into A digital content sharing device between devices including a fingerprint module for inserting and storing a fingerprint can be achieved.

The present invention as described above is another category, as a method for sharing digital content between devices that can reproduce encrypted digital content included in the first device for playing digital content in the second device,

 Decrypting digital content, inserting and storing a fingerprint in the decrypted digital content, and transmitting the digital content in which the fingerprint is inserted to a second device. Is achievable by.

According to one embodiment of the present invention as described above, the user has an advantage that can utilize the digital content in various devices owned by him. At the same time, there is an advantage in that the copyright holder of the digital content can prevent illegal distribution of the digital content.

In addition, even if IPTV or the like is activated and the digital content overflows, the copyright holder can safely produce and provide digital content protected by DRM.

Since the convenience of the user and the protection of the content provider (or copyright holder) are achieved together, the content market can be expanded.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

1 is a schematic block diagram of a digital content sharing system (hereinafter, referred to as a "sharing system") between devices according to the present invention. As shown in FIG. 1, the sharing system includes a first device and a second device capable of playing digital content. The first device includes a digital content sharing module 100, so that the digital content received by the first device can be reproduced by the second device, and the processed digital content is transmitted to the second device.

The first device and the second device are various types of media that can reproduce digital content, such as PDAs, TVs, laptops, or PCs. The first device and the second device may be the same type of device or different types of devices. For example, protection techniques for digital content may be different. In addition, the reproduction environment of the digital content may be different as different types of reproduction devices. Hereinafter, a description will be given of a case where the first device is the notebook 20 and the second device is the PDA 20 with reference to FIG. 1.

The digital content sharing module (hereinafter, referred to as a 'sharing module') 100 included in the notebook 20 may include a receiver 110, an encryption decoder 120, a fingerprint printer 130, a transmitter 140, and the like. It includes.

The receiving unit 110 receives an encrypted digital content, a decryption key, and a license (permission to digital content) from the content distribution server 10. The digital content may be encrypted according to, for example, Digital Rights Management (DRM) technology. In the present invention, the digital content includes all kinds of content such as audio content and video content.

The decryption unit 120 decrypts the encrypted digital content. The decryption unit 120 may use an decryption key (eg, a license) received from the content distribution server 10. For example, the decryption unit 120 releases the DRM applied to the digital content. The digital content in the decrypted state can be played back, and the digital content can be played in audio or video form through the first device.

The fingerprinting unit 130 receives the decrypted digital content, inserts a fingerprint into the digital content based on the leak path tracking information, and stores the digital content into which the fingerprint is inserted.

The leak path tracking information may be received from the decryption unit 120. For example, when the receiver downloads a digital content or a license corresponding to the DMR, the receiver is to input information of the first device. In this case, the inputted information may be utilized as information for tracking the leakage path. As another embodiment, the leak path tracking information may be input from a user of the first device (ie, a receiver of digital content).

The leak path tracking information may be, for example, information of a receiver (ie, a user of the first device) that has received digital content or information about the first device. The information about the first device is information of the first device itself. For example, when the first device is a PDA, it may be a serial number, and when the first device is a notebook 20, it may be an IP address of a notebook user. The recipient's information may be information that can identify the recipient, such as the recipient's name and social security number.

When the fingerprint unit 130 inserts the fingerprint into the digital content, the fingerprint unit 130 may convert the digital content to match the playback environment of the second device. For example, the fingerprinting unit 130 may change the digital content according to the codec or resolution of the PDA, which is the second device, and insert a fingerprint into the changed digital content.

The operation of the fingerprinting unit 130 may be performed while digital content is reproduced in audio or video form through the notebook 20 which is the first device. Alternatively, this may be performed by a simple command such as when receiving, selecting and storing digital content in the notebook 20.

Digital content with embedded fingerprint can be played on any PDA device with other DRM. In addition, since information on the receiver or the first device is inserted into the fingerprint, the user can be traced when illegally disseminated on the web hard or the Internet. Therefore, illegal distribution of digital content can be prevented or blocked.

The transmitter 140 transmits the digital content with the fingerprint inserted to the PDA 30 as the second device. The transmission to the PDA 30 may be performed at the same time as the digital content is played in the notebook 20, or may be performed separately.

In the above, the system for sharing digital content between the first device and the second device using the sharing module 100 included in the first device has been described. Hereinafter, as another embodiment of the present invention, a case in which the sharing module 100 included in the first device is separated as an external device will be described. FIG. 2 shows a state in which an apparatus 200 (hereinafter, referred to as a 'sharing apparatus') 200 for performing a task of sharing digital contents so that encrypted digital contents can be played on different playback devices is applied.

As shown in FIG. 2, the sharing apparatus 200 processes digital content encrypted for use in a plurality of playback devices in accordance with a playback device, and transmits the processed digital content to a plurality of playback devices owned by a user. This allows sharing of digital content between devices. As a reproduction device, for example, PDA 210, TV 220, notebook 230 and the like. Hereinafter, a detailed configuration of the sharing apparatus 200 will be described with reference to FIG. 3. The sharing device 200 includes a decryption module 310, a fingerprinting module 320, a storage module 330, a transmission module 340, and the like.

As illustrated in FIG. 3, the decryption module 310 includes a receiver 311, a decryption unit 312, and an outflow path tracking information unit 313.

The receiving unit 311 receives the encrypted digital content and the decryption key (eg, a license) from the content distribution server 10 and sends them to the decryption unit 312. The receiver 311 may receive a license together.

The decryption unit 312 decrypts the digital content using the decryption key. The encrypted digital content input to the decryption unit 312 may be encrypted by, for example, DRM technology. In this case, the decryption unit 312 releases the DRM.

In addition, the receiver 311 may receive information of a receiver that has received digital content from the content distribution server 10. The recipient's information may be collected, for example, in the act of the receiver purchasing digital content from the content distribution server 10. The recipient's information may be the recipient's name, social security number, or the recipient's personal information associated with a payment method. The information of the receiver is information for tracking the leakage path of the digital content, which can be used to track the distribution path in the case where the digital content is illegally distributed later.

The outflow route tracking information unit 313 generates information on the receiver, which is the outflow route tracking information, and / or information on a reproduction device used by the receiver. One specific example thereof is replaced with the content of the above-described part with reference to FIG. 1. The leak path tracking information and the decrypted digital content are transmitted to the fingerprinting module 320.

The fingerprinting module 320 is for inserting a fingerprint into the decrypted digital content, and includes a changer 321 and a fingerprinting unit 322 as shown in FIG. 3.

The converter 321 receives the decrypted digital content, changes the digital content, and sends the digital content to the fingerprinting unit 322. For example, if the digital content processed by the sharing apparatus 200 according to the present invention is to be transmitted to the PDA 210, the conversion unit 321 changes the digital content in accordance with the codec or resolution of the PDA 210. As another example, if the present invention attempts to transmit digital content processed by the sharing apparatus 200 according to the present invention to the TV 220, the conversion unit 321 changes the digital content in accordance with the resolution of the TV 220. Let's do it. As such, in order to change the digital content in accordance with the playback device, the fingerprinting module 320 may request a user to select a playback device through a separate display screen (not shown). When the user selects the playback device through the display screen, the changer 321 may change the digital content according to the selected playback device.

The fingerprint unit 322 inserts the fingerprint into the digital content based on the leak path tracking information received from the decryption module 310. The decrypted digital content may be arbitrarily illegally distributed to prevent this.

The storage module 330 stores the digital content in which the fingerprint is inserted. The digital content stored in the storage module 330 may be sent to the playback device whenever the user desires and played.

The transmission module 340 transmits the digital content with the fingerprint inserted to the playback device. At this time, the playback devices to be transmitted may be the same type or different types. For example, protection techniques or reproduction environments of digital contents may be different. The content protection technique means a technique in which content is encrypted according to the DRM technology.
Hereinafter, a digital content sharing method (hereinafter, referred to as a "sharing method") between devices according to the present invention will be described with reference to the accompanying drawings. 4 is a flowchart schematically showing a sharing method according to the present invention. For convenience of explanation, a case of using the sharing system of FIG. 1 as an example will be described.

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The first device receives an encrypted digital content and a license from the content distribution server (S410). The license is a right to use digital content, to reproduce encrypted digital content on the first device. Also, the first device may receive a key for decrypting the encrypted digital content while receiving the encrypted digital content.

The first device releases the encrypted digital content using a key that can decrypt the password (S420). For example, the digital content may be encrypted by DRM technology, in which case the DRM is released.

The first device inserts the fingerprint into the decrypted digital content (S430). The fingerprint is inserted based on the information on the receiver or the information on the first device that has received the digital content. For example, the first device may change the decrypted digital content in accordance with the playback environment of the second device (S432), and insert a fingerprint into the changed digital content (S434). In operation S432, for example, the digital content may be changed to match the codec or the resolution of the second device.

The first device stores the digital content in which the fingerprint is inserted (S440). Digital content embedded with a fingerprint may be stored in the form of a file. The storage of the digital content may occur at the same time as the digital content is played back. In addition, it can be made even if the digital content is not played. Digital content stored in the first device may be transmitted to the second device (S450) and played through the second device.

In another embodiment of the present invention, the first device decrypts the encryption (S420), inserts the fingerprint (S430), and transmits to the second device (S450) while playing the digital content using a license. Can be performed.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

1 is a schematic structural block diagram of a system for sharing digital content between devices according to the present invention;

FIG. 2 is a block diagram illustrating an environment to which an apparatus for sharing digital content is applied to play encrypted digital content on different playback devices as another embodiment of the present invention.

FIG. 3 is a schematic block diagram of a device for sharing digital content in FIG. 2;

4 is a schematic flowchart of a method for sharing digital content between devices according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: Content Distribution Server

100: digital content sharing module

110:

120: decryption unit

130: fingerprinting unit

140: transmission unit

200: device for sharing digital content between devices

310: decryption module

311: receiving unit

312: detoxification unit

313: information leakage tracking information

320: fingerprinting module

321: change part

322: printing

330: storage module

340: transmission module

Claims (20)

An inter-device digital content sharing system capable of reproducing the encrypted digital content of the first device in a second device using a digital content sharing device included in a first device that reproduces encrypted digital content, The digital content sharing module included in the first device, A receiving unit to receive the encrypted digital content; An encryption decryption unit for decrypting the encrypted digital content; A fingerprint unit inserting a fingerprint into the decrypted digital content based on the leak path tracking information and storing the digital content into which the fingerprint is inserted; And Transmitter for transmitting the digital content inserted the fingerprint to the second device Including The fingerprinting unit converts the decrypted digital content to be reproduced on the second device, inserts a fingerprint on the converted digital content based on the leak path tracking information, and inserts the fingerprint into the digital content. To store content Digital content sharing system between devices. The method of claim 1, wherein the encrypted digital content, A digital content sharing system between devices that is encrypted by Digital Rights Management technology. The method of claim 1, wherein the outflow path tracking information, Digital information sharing system between the device is the information of the first device or the user information of the first device. delete The method of claim 1, wherein the first device and the second device, The digital content sharing system between devices wherein the protection technique of the digital content is a different playback device. The method of claim 1, wherein the first device and the second device, Digital content sharing system between devices that are codecs or playback devices of different resolutions. A device for sharing digital content so that encrypted digital content can be played on different playback devices. A decryption module for receiving encrypted digital content to decrypt the digital content; And A fingerprinting module for converting the decrypted digital content and inserting a fingerprint into the converted digital content based on the leak path tracking information for the digital content &Lt; / RTI &gt; The fingerprinting module A changer for changing the decrypted digital content in accordance with the codec or resolution of the playback device; And And a fingerprinting unit inserting a fingerprint into the converted digital content based on the leak path tracking information. Device for sharing digital content between devices. The method of claim 7, wherein the encrypted digital content, A device for sharing digital content between devices that is encrypted by digital rights management technology. The method of claim 7, wherein the decryption module, A receiving unit to receive the encrypted digital content; Decryption unit for decrypting the received digital content; And Outflow path tracking information unit for generating outflow path tracking information of the digital content Device comprising a digital content sharing device. According to claim 7, wherein the outflow path tracking information, Device information sharing device between the device which is the information of the receiver receiving the encrypted digital content or information about the playback device used by the receiver. delete The method of claim 7, wherein And a storage module for storing the digital content in which the fingerprint is inserted. A method of sharing digital content between devices that can reproduce encrypted digital content included in a first device that plays digital content in a second device, Decrypting the encrypted digital content; Converting the decrypted digital content in accordance with a playback environment including a codec and / or resolution of the second device; Inserting a fingerprint into the converted digital content; And Transmitting the digital content inserted with the fingerprint to a second device; Digital content sharing method between devices comprising a. The method of claim 13, wherein the encrypted digital content, A method of sharing digital content between devices, which is encrypted by digital rights management technology. delete delete The method of claim 13, wherein the fingerprint, Digital content sharing method is generated based on the leakage path tracking information for the digital content. The method of claim 17, wherein the outflow path tracking information, And digital information or device information of the first device. 14. The method of claim 13, And storing the digital content in which the fingerprint is inserted. The method of claim 13, wherein the first device and the second device, The method of sharing digital content between devices in which the protection technique of the digital content is a different playback device.

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