KR101236459B1 - Terminal apparatus with DRM decoding function and DRM decoding method in terminal apparatus - Google Patents

Abstract

The present invention relates to a terminal device having a DRM decoding function and a DRM decoding method in the terminal device. The terminal device having a DRM decoding function according to the present invention includes a local file memory for storing DRM media content data, and an operating system. A native unit equipped with an application program for driving a media device player by using; and converting a local file path of the DRM media content data into a URL path for a web server when a playback of the DRM media content data is requested from the application program; Providing the media device player and converting the URL path for the web server into a local file path of the DRM media content data when the media device player is requested to play the DRM media content data. By air after the read and decrypt the content data providing unit that provides the DRM decryption to the media player device, it is possible to reproduce the DRM media content data in a terminal device with the operating system without requiring a dedicated DRM decryption module.

Description

Terminal apparatus with DRM decoding function and DRM decoding method in terminal apparatus

The present invention relates to a terminal device having a DRM decryption function and a DRM decoding method in the terminal device. In particular, the terminal device includes a local web server module in which the DRM media content data stored in the terminal device is stored. A terminal device having a DRM decoding function for decoding as a path and a DRM decoding method in the terminal device.

Digital Rights Management (DRM) is a technology that manages copyright of digital content and is one of technologies for preventing illegal use of digital media content. Since DRM technology provides strong level of security based on encryption technology among various types of media content protection technologies and supports various business models since early 2000, music, video, e-book, e-learning, etc. It has been applied to various media content service areas.

On the other hand, in recent years, the spread of terminal devices equipped with an operating system (Operating System) is increasing, such representative devices include Apple's iPhone (iPhone) and Android phones provided by Google and Android phones equipped with the Android operating system have.

However, in the terminal devices equipped with these operating systems, in order to support DRM of audio / video media contents, the decoding module method used in a general PC (Personal Computer) environment cannot be applied. Therefore, a terminal device equipped with these operating systems has a dedicated DRM decoding module directly embedded in the operating system. An example of this is Apple's FairPlay.

Fairplay is a DRM technique made by Apple that is embedded in QuickTime multimedia software and used in Apple's iPhones, iPods and iTunes. Apple's media content can be purchased from the iTunes store, and is encrypted with Fairplay at the time of purchase, so you can use it on devices that do not have rights other than Apple's iPhones, iPods and iTunes. It cannot be decrypted.

However, in the case of the dedicated DRM decoding module embedded directly in the operating system, it is difficult to change the source code of the embedded media device player or add a function due to the characteristics of the operating system. Accordingly, there is a demand for a DRM decoding technology that can utilize the supported codec and functions of the media device player regardless of the version of the operating system of the terminal device.

In order to solve the above problems, the present invention includes a terminal device having a DRM decryption function for decoding a DRM media content data stored in the terminal device as a URL path for a web server by providing a local web server module in the terminal device. And a DRM decoding method in a terminal device.

In order to solve the above problems, a terminal device having a DRM decoding function according to the present invention includes a local file memory for storing DRM media content data, and a native with an application program for driving the media device player using an operating system. A unit and a DRM decryption provided to the media device player after reading and decoding the DRM media content data from the local file memory using a URL path for a web server when a request for reproduction of the DRM media content data is requested from the application program. Provide the unit.

The DRM decoding unit converts a local file path of the DRM media content data into a URL path for the web server and provides the media device player when the DRM media content data is requested to be played from the application program. When the DRM media content data is requested to be played from the player, the media device converts the URL path for the web server into a local file path of the DRM media content data, reads and decodes the DRM media content data from the local file memory, and then decodes the media device. It is desirable to provide to the player.

The DRM decoding unit includes: a decoding module unit for decoding the DRM media content data, a resource manager unit for converting and managing a local file path of the DRM media content data into the URL path for the web server; When the DRM media content data is requested to be played, the DRM media content data is read from the local file memory by receiving a local file path of the DRM media content data corresponding to the URL path for the web server from the resource manager. It provides a web server module for decoding the read DRM media content data using the decryption module and then providing the same to the media device player.

The web server module unit includes a request handler that provides HTTP response information and the decoded media content data in response to a Hyper Text Transfer Protocol (HTTP) range request from the media device player, and the HTTP range from the media device player. When the request includes a request to play the DRM media content data, the DRM media content data is received from the local file memory by receiving a local file path of the DRM media content data corresponding to the URL path for the web server from the resource manager. Reads and decrypts the read DRM media content data using the decryption module and provides the file manager to return to the request handler.

The request handler preferably checks the validity of the URL path for the web server including a globally unique identifier of the concept of OneTime Password (OTP) that is changed every time the DRM media content data is played.

The DRM decoding unit further includes a license manager unit that manages a license of the DRM media content data, and a media player controller unit that is responsible for playing and controlling the media device player, wherein the resource manager unit is configured to execute the license manager unit. It is preferable to provide a local file path of the DRM media content data to request confirmation of the license, and if the DRM media content data is a normal license, request the media player controller to play the URL path for the web server.

When the decryption module unit receives the read DRM media content data from the web server module unit, the license manager inquires whether the read DRM media content data is licensed, receives a predetermined encryption key, and reads the read. It is desirable to decode the DRM media content data.

The DRM decoding unit may further include a download manager unit which downloads the DRM media content data of an external server and stores the DRM media content data in the local file memory, and when remote playback of the DRM media content data of the external server is requested from the application program. Preferably, the web server module unit checks whether the DRM media content data is in a download completion state before reading the downloaded DRM media content data.

The DRM decryption unit may further include a security manager configured to check whether the terminal apparatus is abnormally driven and to control whether the read-only DRM media content data is decrypted or not decrypted by the decryption module unit in accordance with a security rule. Do.

When the DRM media content data is requested to be played by the media device player, the web server module unit calls the security manager and detects the packet sniffing to intercept network traffic. The DRM media content data read by the decryption module unit is detected. It is preferable to control so that is not decrypted.

The DRM decoding method in a terminal device equipped with a local file memory for storing DRM media content data and an application program for driving a media device player using an operating system includes the DRM media content data from the application program. When the playback is requested, the decoding step using the web server URL path provided to the media device player after reading and decoding the DRM media content data from the local file memory using the web server URL path is provided.

The decoding using the URL path for the web server may include converting a local file path of the DRM media content data into a URL path for a web server and providing the media device player when the DRM media content data is requested to be played from the application program. And converting the URL path for the web server into a local file path of the DRM media content data by reading the DRM media content data from the local file memory when the media device player is requested to play the DRM media content data. And decoding the decoded media content data to the media device player.

According to the present invention, by providing a local web server module inside the terminal device, the DRM media content data can be played in the terminal device equipped with the operating system without a dedicated DRM decoding module.

1 is a schematic block diagram of a DRM system associated with a terminal device according to an embodiment of the present invention.
FIG. 2 is a detailed block diagram of the DRM decoding unit illustrated in FIG. 1.
3 is a flowchart illustrating a DRM decoding method in a terminal device according to an embodiment of the present invention.

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

1 is a schematic block diagram of a DRM system associated with a terminal device according to an embodiment of the present invention.

As shown in FIG. 1, the terminal device-linked DRM system 100 includes a content providing server 110, a license issuing server 120, a personal computer (PC) 130, and an operating system-mounted terminal device 140. do.

In the content providing server 110, media contents to be provided to the user are encrypted using an encryption key provided from the license issuing server 120 and stored as digital rights management (DRM) media contents 112.

The license issuing server 120 is a server that generates and issues a license for the DRM media contents 112 stored in the content providing server 110.

The PC 130 may be connected to the content providing server 110 through the Internet, and the user may download and store DRM media content after connecting the PC 130 to the content providing server 110 through a login or the like. .

The operating system-mounted terminal device 140 includes a native unit 150 that performs a function of a general terminal device and a DRM decoding unit 160 that decrypts DRM media content. An operating system-equipped terminal device 140 includes an iPhone equipped with an Apple operating system (iOS) and an Android phone equipped with an Android operating system provided by Google.

Native unit 150 includes a number of application programs 152, media device player 154, and local file memory 156. The native unit 150 downloads the DRM media content stored in the PC 130 through a USB (Universal Series Bus) or the like when the user drives the download related application program 152, and the DRM media content in the local file memory 156. The DRM media content 112 stored in the content providing server 110 is stored as data or stored in the local file memory 156 as DRM media content data through Wi-Fi. Media device player 154 includes MPMoviePlayer, AVPlayer (iOS4 +), AudioQueue, and the like.

The DRM decryption unit 160 includes a decryption core 162, a web server module unit 164, and a decryption module unit 166.

When the decryption core 162 is requested to play the DRM media content data stored in the local file memory 156 from the application program 152, the decryption core 162 inquires whether the license for the DRM media content data for which playback is requested is licensed. do. The decryption core 162 is connected to the license issuing server 120 through the native unit 150 when the decryption core 162 is not licensed for the DRM media content data requested for playback. In this case, a secure channel is formed between the OS-mounted terminal device 140 and the license issuing server 120 by using a key distribution algorithm of a diffie-helman method. The operating system-mounted terminal 140 transmits a single identifier of the operating system-mounted terminal 140 to the license issuing server 120, and the license issuing server 120 sends a single identifier of the operating system-mounted terminal 140. Send the used device-binding license. The operating system-mounted terminal device 140 stores the device combination license transmitted from the license issuing server 120 in the license storage 168. When the decryption core 162 is licensed for the DRM media content data requested for playback, the decryption core 162 stores a virtual local file path of the DRM media content data stored in the local file memory 156 as a virtual uniform resource locator for a web server. The path is converted and provided to the media device player 154.

When the web server module unit 164 is requested to play the DRM media content data stored in the local file memory 156 from the media device player 154, the web server module unit 164 stores the URL path for the web server in the local file memory 156. Reverse-transform into the physical local file path of the data, read the DRM media content data stored in the local file memory 156 using the physical local file path, and decrypt the read DRM media content data using the decryption module 166. Then to the media device player 154.

The decryption module unit 166 decrypts the DRM media content data provided from the web server module unit 164. The decryption module unit 166 decrypts the DRM media content data by obtaining predetermined encryption key (CEK) information from the license storage 162 of the decryption core 162.

FIG. 2 is a detailed block diagram of the DRM decoding unit illustrated in FIG. 1.

As shown in FIG. 2, the DRM decryption unit 160 includes an application interface unit 210, a license manager unit 220, a resource manager unit 230, a media player controller unit 240, and a decryption module unit 166. , A web server module unit 164, a security manager unit 250, and a download manager unit 270.

The application interface unit 210 is an interface for processing a request for playing the DRM media content data stored in the local file memory 156 by the application program 152. The application interface unit 210 may call and control various functions related to the playback of the media device player 154 when the application program 152 is requested to play the DRM media content data stored in the local file memory 156. Interface functions and deliver various events related to the playback of the media device player 154 to the application program 152.

The license manager 220 includes a license repository 168 and is connected to the license issuing server 120 through the application interface 210. When the license manager 220 is connected to the license issuing server 120, the license manager 220 is responsible for issuing and updating a license related to the DRM media content. The license manager 220 inquires whether the DRM media content data is licensed when the DRM media content data is requested to play through the application interface unit 210, and when the license period has elapsed or the number of licenses has been reproduced. Prohibit license for DRM media content data.

The resource manager 230 converts and manages a physical local file path of the DRM media content stored in the local file memory 156 into a URL path for a web server. When the DRM media content data stored in the local file memory 156 is requested by the application program 152 through the application interface unit 210, the resource manager 230 may physically display the DRM media content data requested for playback. The in-file path is converted into a URL path for the web server and provided to the media player controller 240.

In addition, the resource manager 230 provides the license manager 220 with a local file path of the DRM media content data requested for playback, and requests license confirmation and issuance of the DRM media content data requested for playback. In addition, the resource manager 230 provides a URL path for the web server to the media player controller 240 when the license of the DRM media content data requested for playback is confirmed.

The media player controller 240 creates an object of the basic media device player 154 embedded in the OS-mounted terminal device 140 to play and control the media. The media player controller 240 performs a command related to the media device player 154 of the application program 152 transmitted to the application interface unit 210 and receives an event generated from the media device player 154. To pass). In addition, the media player controller 240 controls the media device player 154 according to a command when a pause, position search, double speed control, and playback stop command are input in the application program 152 through the application interface unit 210. To control.

The decryption module unit 166 decrypts the DRM media content data for which reproduction is requested, which is read from the local file memory 156. The decryption module unit 166 requests a license inquiry from the license manager 220, obtains predetermined encryption key (CEK) information necessary for decryption from the license manager 220, and retrieves the DRM media content data for which playback is requested. Decrypt

The web server module unit 164 returns a corresponding data of the requested DRM media content in response to a Hyper Text Transfer Protocol (HTTP) range request from the resource manager unit 230.

When the web server module unit 164 is requested to play DRM media content data from the media device player 154, the local file path of the DRM media content data to be played corresponding to the URL path for the web server from the resource manager 230 is requested. To be provided. The web server module unit 164 reads the DRM media content data to be stored in the local file memory 156 using a local file path of the DRM media content data to be played. The web server module unit 164 provides the DRM media content data read from the local file memory 156 to the decryption module unit 166, and transmits the media content data decrypted by the decryption module unit 166 to the media device player 154. )

The web server module unit 164 may include a request handler 262 and a file manager 264. The request handler 262 is responsible for processing an HTTP request request, and includes a globally unique identifier (GUID: Globally Unique IDentifier) of the OneTime Password (OTP) concept that changes every time the DRM media content data is played. Checks the validity and provides HTTP response information and decrypted media content data as a response. The file manager 264 reads the DRM media content data by converting the URL path for the web server into a corresponding local file path through the resource manager 230 when the HTTP request includes a request for the DRM media content data of a specific resource. After turning on, the decoding module 166 performs decoding and returns the decrypted media content data.

The security manager 250 checks whether the terminal device is abnormally driven, that is, jailbreak to release or hack Apple's iPhone lock device, or rooting to gain administrator's authority by hacking the operating system of the Android company. The module unit 166 may control the decoding operation not to be performed. Also, in this case, if the security rule permits decryption, the security manager unit 250 may control the decryption module unit to read the DRM media content data.

In addition, if the packet manager sniffing the network traffic in the loopback environment is detected, the security manager 250 may expose the decrypted media content data delivered to the media device player 154 through the web server module 164. As such, the decryption module unit 166 controls not to perform the decryption operation.

The download manager 270 downloads and manages DRM media content data of an external server, for example, the content providing server 110 in the remote play mode. That is, if the download manager 270 wants to play DRM media content data in an external server instead of playing DRM media content data stored in the local file memory 156, the download manager unit 270 stores the DRM media content data in the local file memory 156. It is in charge of storing in). When the remote file data is in a playback mode (progressive download or download & play), the file manager 264 of the web server module unit 164 sends the DRM media to the download manager unit 270 before reading the requested DRM media content data. Check if all the content data has been downloaded and wait if not completed.

3 is a flowchart illustrating a DRM decoding method in a terminal device according to an embodiment of the present invention.

The user operates the content reproduction related application program 152 stored in the terminal device (S302). If the user selects the DRM media content data to be played from among the files displayed in the application program 152, for example, Documents / video.mp4 and clicks play, the application program 152 executes the application interface of the decryption unit 160. The unit 210 provides a play related function and a local file path of the DRM media content data.

When the playback related function is input, the application interface unit 210 calls the security manager 250 to check the security state of the OS-mounted terminal device 140 (S304). The security manager 250 checks whether the terminal device is abnormally driven, that is, jailbreak to release or hack Apple's iPhone lock device, or rooting to gain administrator's authority by hacking the operating system of the Android company (S406). If not, the decryption module unit 166 controls the decryption operation not to be performed. When it is determined that the operating system-mounted terminal device 140 is normally driven by the call of the security manager 250, the local file path of the DRM media content data to be played back, which is input to the application interface unit 210, is a resource manager. It is provided to the unit 230.

The resource manager 230 provides a local file path inputted to the license manager 220, for example, Documents / video.mp4, and requests confirmation and issuance of a license for DRM media content data to be played ( S306).

In addition, the resource manager 230 converts the local file path of the DRM media content data to be played into a URL path for a web server when the license of the DRM media content data requested for playback is confirmed, and the media player controller unit 240. Request playback of a web server URL, for example, http: //localhost/xxxx_video.mp4 (S308). Here, the conversion is a concept that includes all configurations that can use a URL for a web server including a match.

The media player controller 240 generates an object of the basic media device player 154 embedded in the operating system-mounted terminal device 140 and provides the object to the media device player 154, and the media device player 154 provides a media URL. For example, GET / xxxx_video.mp4 is generated, and DRM media content data to be played, for example, 0 to 16384 bytes, is requested (S310).

When the web server module 164 receives the DRM media content data to be played from the media device player 154, the web server module 164 calls the security manager 250 to check the security state. If the packet manager sniffing the network traffic in the loopback environment is detected (S312), the security manager unit 250 exposes the decrypted media content data delivered to the media device player 154 through the web server module unit 164. Since the decoding module unit 166 does not perform the decoding operation, it may also be controlled.

When it is determined that the terminal apparatus is normally driven by the call of the security manager 250, the web server module 164 obtains a local file path for the URL for the web server from the resource manager 230 (S314).

When the file manager 264 of the web server module 164 receives the local file path from the resource manager 230, the file manager 264 reads the DRM media content data stored in the local file memory 156 using the local file path. (S316).

The web server module unit 164 provides data of the read DRM media content data to the decryption module unit 166. The decryption module unit 166 requests a license inquiry from the license manager 220, obtains predetermined encryption key (CEK) information necessary for decryption from the license manager 220, and retrieves the DRM media content data for which playback is requested. Decode (S318).

The request handler 262 of the web server module 164 transmits the decrypted media content data to the media device player 154 through the decryption module 166 (S320). In this case, the web server module unit 164 transmits response information, for example, HTTP 200 OK and 0-16384 bytes to the media device player 154.

The media device player 154 plays the decrypted media content received from the web server module unit 164 and checks whether the media content has been played (S322). If playback of the media content is complete, play or end the other media content, otherwise the media device player 154 continues to request data of the same media content.

The DRM decoding method in the terminal apparatus shown in FIG. 3 may be stored and supplied to a readable recording medium. The readable recording medium herein includes an app store or the like from which an application program can be purchased.

The protection scope of the present invention should be interpreted by the following claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It should be interpreted that it is included in the scope of right.

110: content providing server
120: license issuing server
130: PC
140: terminal device with operating system
150: native unit
152: application program
154: media device player
156: local file memory
160: DRM decoding unit
162: decryption core
164: web server module
166: decryption module unit
168: license store

Claims (14)

In a terminal device having a DRM decoding function therein,
A native unit having a local file memory for storing DRM media content data, an application program for driving a media device player using an operating system,
And a DRM decoding unit which reads and decodes the DRM media content data from the local file memory using a URL path for a web server when the DRM media content data is requested to be played from the application program, and provides the media device player to the media device player. and,
The DRM decoding unit converts a local file path of the DRM media content data into a URL path for the web server and provides the media device player when the DRM media content data is requested to be played from the application program. When the DRM media content data is requested to be played from the player, the media device converts the URL path for the web server into a local file path of the DRM media content data, reads and decrypts the DRM media content data from the local file memory, and then the media device. Terminal device having a DRM decoding function, characterized in that provided to the player. delete The method of claim 1,
The DRM decoding unit,
A decoding module unit for decoding the DRM media content data;
A resource manager unit for converting and managing a local file path of the DRM media content data into a URL path for the web server;
When the DRM media content data is requested to be played from the media device player, the DRM media content is received from the local file memory by receiving a local file path of the DRM media content data corresponding to the URL path for the web server from the resource manager. And a web server module unit which reads data, decodes the read DRM media content data using the decoding module, and provides the media server player to the media device player. The method of claim 3,
The web server module unit,
A request handler for providing HTTP response information and the decrypted media content data in response to a Hyper Text Transfer Protocol (HTTP) range request from the media device player;
When the HTTP range request from the media device player includes a request to play the DRM media content data, the resource manager receives a local file path of the DRM media content data corresponding to the URL path for the web server from the resource manager. And a file manager which reads the DRM media content data from a local file memory and returns the read DRM media content data to the request handler after decoding the read DRM media content data using the decryption module. Terminal device. 5. The method of claim 4,
The request handler checks the validity of the URL path for the web server including the globally unique identifier of the concept of OneTime Password (OTP) that is changed every time the DRM media content data is played. Terminal device provided. 6. The method according to any one of claims 3 to 5,
The DRM decoding unit,
A license manager unit for managing a license of the DRM media content data;
Further comprising a media player controller for playing and controlling the media device player,
The resource manager unit provides the license manager with a local file path of the DRM media content data to request confirmation of the license, and if the DRM media content data is a normal license, the media player controller unit URL for the web server. Terminal device having a DRM decoding function, characterized in that for requesting the reproduction of the path. The method according to claim 6,
When the decryption module unit receives the read DRM media content data from the web server module unit, the license manager inquires whether the read DRM media content data is licensed, receives a predetermined encryption key, and reads the read. A terminal apparatus having a DRM decoding function, characterized by decoding the DRM media content data. 6. The method according to any one of claims 3 to 5,
The DRM decoding unit further includes a download manager unit for downloading and storing the DRM media content data of an external server in the local file memory.
When remote playback of the DRM media content data of the external server is requested from the application program, the web server module unit completes the download of the DRM media content data in the download manager unit before reading the corresponding DRM media content data. Terminal device having a DRM decoding function, characterized in that the identification. 6. The method according to any one of claims 3 to 5,
The DRM decryption unit may further include a security manager configured to check whether the terminal apparatus is abnormally driven and, if abnormal, control the DRM media content data read from the decryption module unit to be decrypted or not decrypted according to a security rule. A terminal apparatus having a DRM decoding function. 10. The method of claim 9,
When the DRM media content data is requested to be played by the media device player, the web server module unit calls the security manager and detects the packet sniffing to intercept network traffic. The DRM media content data read by the decryption module unit is detected. The terminal apparatus having a DRM decoding function, characterized in that the control so that is not decrypted. In the DRM decoding method in a terminal device equipped with a local file memory for storing DRM media content data and an application program for driving the media device player using an operating system,
When a request for playing the DRM media content data is requested from the application program, a URL path for a web server provided to the media device player after reading and decoding the DRM media content data from the local file memory using a URL path for a web server is provided. Using a decoding step,
Decryption step using the URL path for the web server,
Converting a local file path of the DRM media content data into a URL path for a web server and providing the media device player when the DRM media content data is requested to be played by the application program;
When the media device player is requested to play the DRM media content data, converting the URL path for the web server into a local file path of the DRM media content data and reading and decoding the DRM media content data from the local file memory. Wow,
And providing the decoded media content data to the media device player. delete The method of claim 11,
The providing of the URL path for the web server to the media device player may include: requesting confirmation of a license by providing a local file path of the DRM media content data, and for the web server when the DRM media content data is a normal license. And providing a URL path to the media device player. delete

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