JP4740925B2 - DRM content playback method and apparatus - Google Patents

Description

  The present invention relates to a method for providing content, and more particularly, the content player reproduces the content to be played by using a hooking technology and a DRM (Digital Rights Management) technology. The present invention relates to a method and system for providing content to a user.

  Various contents have been developed with the recent rapid advancement of wired / wireless communication technology, and the developed content can be easily accessed by users through such wired / wireless communication technology. It is the driving force that enables development.

  However, despite the fact that the developed content is one asset that has been invested in capital and labor, as with other products that are generally distributed, it is easy due to the characteristics of digital data itself. There is a problem that it is distributed illegally.

  In particular, as the Internet, which is a computer communication network, rapidly spreads with the development of WWW (World Wide Web) technology, the distribution, distribution, or propagation of digital content through the Internet is rapidly expanding. Therefore, various security technologies have been developed to prevent illegal copying and distribution of digital contents.

  DRM is one of the typical security techniques for protecting digital content, and defines the right to use digital content as information combined inside the digital content. For example, DRM can define the number of times digital content can be played, whether or not copying is possible, and the number of times.

  In addition, the digital content is protected through the encryption process so that illegal distribution and illegal copying of the content can be prevented through the entire process from generation to distribution, use, and disposal by the DRM technology. In DRM, only a legitimate user having an encryption key decrypts and uses the encrypted content, and even if illegally distributed, it cannot be used without a key necessary for decryption.

  On the other hand, in order to reproduce the content encrypted by DRM, the content reproduction program cannot reproduce the content in the encrypted state. Therefore, after decrypting the encrypted content, the decryption is performed. Play the content that has been converted.

  Generally, in order for a content reproduction program existing in a local terminal to be provided with a content from a server that provides the content, the content decrypted from the server is provided in a streaming format and decrypted. The content is played back without being processed, or the encrypted content is provided, the encrypted content is decrypted, the decrypted content is temporarily stored, and then the stored content is Reproduce. However, security vulnerabilities occur in both cases.

  In addition, when there is a process of calling content inside the content, such as when calling other content while one content is being executed, it is difficult to apply DRM immediately after the content to be called is unknown. It was necessary to change the source of the source. Accordingly, there is an urgent need for a content providing method and apparatus capable of reducing the security vulnerability and applying DRM without changing the content source.

  A technical problem to be solved by the present invention is to provide a content reproduction method and apparatus capable of reducing the security vulnerability and applying DRM without changing the content source.

  The DRM content playback method for solving the technical problem includes a step in which a content control unit hooks a first content request signal output from a content playback unit to a local terminal, and the content control unit is hooked. A step of outputting a second content request signal corresponding to the first content request signal to the server, and the content control unit receiving information about the content corresponding to the second content request signal output from the server Receiving the content information), and the content control unit outputting the received content information to the content reproduction unit.

  In the DRM content reproduction method, the content control unit outputs a DRM key request signal for requesting a DRM key corresponding to the content to the server, and responds to the DRM key request signal from the server. Receiving the output DRM key; and decrypting the received content information based on the received DRM key, wherein the content control unit outputs to the content playback unit The content information to be may be the decrypted content information.

  In the DRM content playback method, the content playback unit plays the content based on the decrypted content information, and the content playback unit outputs the content to the local terminal based on the content to be played back. The content control unit hooking the third content request signal, and the content control unit outputting a fourth content request signal corresponding to the hooked third content request signal to the server. The content control unit receives content information corresponding to the fourth content request signal output from the server, and the content control unit outputs the received content information to the content reproduction unit. A stage.

  The DRM content reproduction method may further include the step of the content control unit outputting authentication information to the server in order to receive the DRM key from the server. The content may be flash content.

  According to another aspect of the present invention, there is provided a DRM content reproduction method in which a content control unit hooks a first content request signal output from a content reproduction unit to a local terminal, and the hooked first content request signal And determining whether content corresponding to the first content request signal exists in the local terminal, and, as a result of the determination, if the content exists in the local terminal, the content control unit May include reading the content information from the local terminal, decrypting the received content information, and outputting the decrypted content information to the content playback unit.

The content control unit outputs a DRM key request signal corresponding to the content to the server in order to decrypt the received content information, and is output from the server in response to the DRM key request signal. Receiving a DRM key, and the content controller may decrypt the content information based on the received DRM key.

  According to another aspect of the present invention, there is provided a method for reproducing DRM content in which a content control unit hooks a first content request signal output from a content reproduction unit to a local terminal, and the hooked first content request signal. And determining whether content corresponding to the first content request signal exists in the local terminal, and if the content does not exist in the local terminal as a result of the determination, the content control A second content request signal corresponding to the first content request signal whose part is hooked is output to the server, content information corresponding to the second request signal output from the server is received, and the received content Outputting information to the content reproduction unit, and as a result of determination, If Ceiling is present in the local terminal, the contents control unit receiving said information about the contents from the local terminal, and outputting the content information with the received to the content reproduction unit may include a. The DRM content reproduction method can be recorded on a recording medium.

  A DRM content playback apparatus for achieving the technical problem includes a content playback unit that outputs a first content request signal to a local terminal and a content control unit that hooks the first content request signal. The second content request signal corresponding to the hooked first content request signal is output to the server, the content information corresponding to the second content request signal output from the server is received, and the received content Information is output to the content reproduction unit.

  The content control unit outputs a DRM key request signal for requesting a DRM key corresponding to the content to the server, receives a DRM key output in response to the DRM key request signal from the server, Based on the received DRM key, the received content information can be decrypted, and the decrypted content information can be output to the content playback unit. Since the content providing apparatus receives the DRM key from the server, it can further output authentication information to the server.

  The content reproduction unit further determines whether content corresponding to the first content request signal exists in the local terminal based on the hooked first content request signal. When content is present in the local terminal, the content information can be received from the local terminal, the received content information can be decrypted, and the decrypted content information can be output to the content playback unit .

  The DRM content playback method and apparatus according to the present invention have the effect of being able to apply DRM without changing the content source even when calling other content inside the content by reducing security vulnerabilities.

  For a full understanding of the invention and the operational advantages thereof and the objects achieved by the practice of the invention, reference should be made to the accompanying drawings illustrating the preferred embodiments of the invention and the contents described in the accompanying drawings. Must.

In order to more fully understand the drawings cited in the detailed description of the present invention, a detailed description of each drawing is provided.
Further, in the present specification, when any one component “transmits” data to another component, the component can also directly transmit the data to the other component, It means that the data can also be transmitted to the other component through at least one other component. In addition, when any one component is “connected” to another component, the component can be directly connected to the other component, through at least one other component. It means that it can also be linked.

  Conversely, when any one component “directly transmits” data to another component, the data is transmitted to the other component without passing through the other component by the component. Means. In addition, when any one component is “directly connected” with another component, it is connected between the component and the other component without passing through another component. means.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like members.
FIG. 1 is a data flowchart of a DRM content reproduction method according to an embodiment of the present invention. Referring to FIG. 1, a DRM content playback apparatus 100 according to an embodiment of the present invention may include a content control unit 110 and a content playback unit 130. The content control unit 110 can hook the first content request signal output from the content reproduction unit 130 to the local terminal 200 (S100) (S110).

  The local terminal 200 may be a file system of a system in which the DRM content playback apparatus 100 is provided or an OS (operation system) for controlling the file system. In addition, the first content request signal may be a message requesting the OS for information about content to be played back by the content playback unit 130 (for example, the content path and file name). Hereinafter, “information about content” is simply referred to as “content information”.

  That is, the content reproduction unit 130 may execute a general procedure for reproducing content existing in the local terminal 200. Hooking means intercepting a message or API.

  Accordingly, hooking according to the present invention means API (Application Program Interface) hooking in which the content control unit 110 hooks a message output to the OS of the local terminal 200.

  Next, the content controller 110 hooks the first content request signal (S110), and outputs a second content request signal corresponding to the hooked first content request signal to the server 300 (S120). Of course, the content controller 110 may determine whether the requested content exists in the local terminal 200 based on the first content request signal. As a result of the determination, if it exists, the content can be received from the local terminal 200, which will be described later with reference to FIG.

  The second content request signal is a signal for requesting the server 300 for the content based on the first content request signal. For this purpose, information included in the first content request signal (for example, the content Information corresponding to the server 300 (for example, a file path of the content in the server 300).

Before the content control unit 110 outputs the second content request signal to the server 300, the content control unit 110 may include information that may be included in the second content request signal (eg, a file path of the content in the server 300). In order to obtain a predetermined signal, the server 30
It is also possible to further output predetermined information corresponding to the predetermined signal (for example, whether or not the content exists in the server 300 and a file path) from the server 300 in advance. it can.

  Next, the content controller 110 may receive the content information corresponding to the second content request signal output from the server 300 (S130). The content information may include the content file itself and additional information of the content file, and the content control unit 110 may receive the content information in a streaming format or a file download format. The content information may be a file encrypted using DRM as will be described later.

  In addition, the content control unit 110 may output the received content information to the content reproduction unit 130 (S140), and the content reproduction unit 130 may output the content information output from the content control unit 110. The content can be reproduced based on the above.

  In addition, the content is flash content, and another content may be called during the reproduction of the content. For example, when the content includes a predetermined interface (for example, a button), the second content must be played if the user selects (for example, clicks) the predetermined interface (for example, a button). There can be.

  Next, the content reproducing unit 130 may output a third content request signal for requesting the second content to the local terminal 200 in order to reproduce the second content. Next, the content controller 110 can hook the third content request signal again, and can output a fourth content request signal corresponding to the third content request signal to the server 300.

  Accordingly, the content control unit 110 can receive second content information (for example, the encrypted second content) that is information about the second content, and the received second content. Information can be output to the content reproduction unit 130. Of course, at this time, the content control unit 110 can also decrypt the second content information and output it to the content reproduction unit 130.

  As described above, the content control unit 110 API-hooks the request signal output to the local terminal 200. Therefore, even when another content is called inside the content, the other content is DRM can be applied without changing the content source regardless of whether it is called on a relative route or on an absolute route based on content.

  Meanwhile, if the content is content encrypted by DRM, the content control unit 110 requests a DRM key that can decrypt the content before receiving the content information from the server 300 (S130). A DRM key request signal can be further output (S111). Of course, the server 300 may include a separate DRM server for handling DRM and a file server for storing the content according to an embodiment. Then, various modifications that can be easily inferred are possible.

However, in this specification, the case where it is embodied as one server will be described as an example, and the scope of rights of the present invention is not limited to this. Next, the server 300 may output a DRM key capable of decrypting the content to the content controller 110 in response to the DRM key request signal (S113).

  If the content information is received from the server 300 based on the DRM key output from the server 300 (S130), the content control unit 110 can decrypt the content (S131). The content control unit 110 can output the decrypted content to the content reproduction unit 130.

  When the content control unit 110 receives the content information as a streaming method, the content control unit 110 stores the received part of the content information in a memory in real time based on the received DRM key. After the decryption is performed, the decrypted portion can be output to the content reproduction unit 130.

  Accordingly, the decrypted content information may not be stored in the local terminal 200 provided with the DRM content playback apparatus 100. Therefore, security vulnerabilities can be reduced. In addition, since the content control unit 110 receives the DRM key from the server 300, the content control unit 110 can further output authentication information to the server 300. The server 300 has been successfully authenticated based on the authentication information. Only in this case, the DRM key can be output to the content control unit 110. Of course, such an authentication process may be performed any time before receiving the DRM key. The content may be content produced as a flash.

  In order to execute a content playback method according to an embodiment of the present invention, the DRM content playback apparatus 100 loads a control on a web page according to a user request (eg, click) or an event occurrence. The loaded control can control the content request and playback of the DRM content playback unit 130 while performing the role of the content control unit 110.

  The loaded control can insert at least one operation required for an API (Application Program Interface) used by the content reproduction unit 130 through injection.

  For example, when two operations, a create file (CreateFile) and a read file (ReadFile), are inserted, the create file is checked from the server 300 for existence or path of the file, authentication, reception of the DRM key, and Content can be received, and the lead file can decrypt the received content in the memory and transmit it to the content reproduction unit 130. Of course, each of the operations and functions described above is merely an embodiment of the present invention, and the scope of rights of the present invention is not limited thereto.

  FIG. 2 is a data flowchart of a DRM content playback method according to another embodiment of the present invention. Referring to FIG. 2, the content control unit 110 can hook the first content request signal output from the content reproduction unit 130 to the local terminal 200 (S200) (S210). The content controller 110 may determine whether content corresponding to the first content request signal exists in the local terminal 200 based on the hooked first content request signal (S210).

That is, a predetermined message for checking the existence of a file corresponding to the content can be output to the file system of the local terminal 200 or an OS that controls the file system. Local terminal 2
If it exists at 00, the content controller 110 may receive the content information from the local terminal 200 (S220).

  That is, unlike the case described in FIG. 1, when the content is stored in the local terminal 200, it is not necessary to receive the content from the server 300. The content information can be received directly (S220).

  Further, the content control unit 110 can decrypt the received content information (S230), and can output the decrypted content information to the content reproduction unit 130 (S240).

  In addition, the content control unit 110 can output a DRM key request signal corresponding to the content to the server 300 in order to decrypt the received content information (S213). A DRM key output in response to the key request signal can be received (S215). In addition, the authentication process can be performed before requesting the DRM key, as described with reference to FIG.

  Next, the content control unit 110 may decrypt the content information based on the received DRM key (S230). According to another exemplary embodiment of the present invention, the content control unit 110 can hook a first content request signal output to the local terminal 200. The content controller 110 may determine whether content corresponding to the first content request signal exists in the local terminal 200 based on the hooked first content request signal.

  If the content does not exist in the local terminal 200 as a result of the determination, as described with reference to FIG. 1, the content control unit 110 determines that the second content corresponding to the hooked first content request signal. A request signal may be output to the server 300, content information corresponding to the second request signal output from the server 300 may be received, and the received content information may be output to the content reproduction unit 130. Of course, the content controller 110 may further execute a process of receiving a DRM key and a process of executing authentication.

  If it is determined that the content exists in the local terminal, the content control unit 110 receives the content information from the local terminal 200 and receives the content information as described with reference to FIG. The content information can be output to the content reproduction unit 130. Of course, the DRM key can be received from the server 300 for decrypting the content as described with reference to FIG.

The DRM content playback method according to the embodiment of the present invention can be embodied as a program code form that can be downloaded through a network.
Also, the DRM content reproduction method according to the embodiment of the present invention can be embodied as a computer readable code on a computer readable recording medium. Computer-readable recording media include all types of recording devices that can store data that can be read by a computer system. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy (registered trademark) disk, optical data storage device, and the like. It is distributed to computer systems connected by a network, and computer readable code is stored and executed in a distributed manner. A functional program, code, and code segment for implementing the present invention can be easily inferred by a programmer in the technical field to which the present invention belongs.

  The apparatus and method according to embodiments of the present invention can be used in a DRM content playback apparatus.

4 is a data flowchart of a DRM content reproduction method according to an embodiment of the present invention. 9 is a data flowchart of a DRM content reproduction method according to another embodiment of the present invention.

Explanation of symbols

100: DRM content playback device 110: content control unit 130: content playback unit 200: local terminal 300: server

Claims (10)

A DRM content playback method for a content playback unit to play back content, wherein the content playback unit receives a first content request signal including a route and file name of the content in order to request the content from a local terminal. Output to the local terminal,
The DRM content playback method includes:
The method comprising the content control unit, hooking the first content request signal output from the content reproduction unit to the local terminal;
The contents control unit, the second content request signal including the file path of the content in the server, and outputting to said server;
The content control unit receives content information, which is information about the content encrypted using DRM, from the server in response to a second content request signal , wherein the content information is a content file Including itself and additional information of the content file ;
The content control unit receiving and decoding the content information and outputting the decrypted content information to the content reproduction unit;
The content reproduction unit reproducing the content based on the decrypted content information;
With
The step of the content control unit decrypting the content information includes:
The content control unit outputting a DRM key request signal for requesting a DRM key corresponding to the content to the server;
Receiving a DRM key output from the server in response to the DRM key request signal;
The content control unit decrypts the received content information based on the received DRM key;
With
When the second content is called during playback of the content, the content playback unit includes a third content request signal including a path and a file name of the second content to request the second content from the local terminal. To the local terminal,
The DRM content playback method further includes:
The content control unit hooking the third content request signal;
The content control unit outputting a fourth content request signal including a file path of the second content at the server to the server;
Wherein the content control unit receives second content information, which is information about the encrypted second content, from the server in response to the fourth content request signal; Includes the content file itself of the second content and additional information of the content file;
The DRM content reproduction method comprising: the content control unit receiving, decoding and outputting the second content information to the content reproduction unit . The DRM content playback method further includes:
The content control unit outputting authentication information to the server to receive the DRM key from the server;
The DRM content reproduction method according to claim 1 . The content is flash content.
The DRM content reproduction method according to claim 1 . A DRM content playback method for a content playback unit to play back content, wherein the content playback unit receives a first content request signal including a route and file name of the content in order to request the content from a local terminal. Output to the local terminal,
The DRM content playback method includes:
The method comprising the content control unit, to full Kkingu the first content request signal output from the content reproduction unit to the local terminal;
The method comprising the content control unit, based on the hooked first contents request signal, the content to be thus requested first contents request signal to determine whether or not present in the local terminal;
A result of the determination, if the content is present in the local terminal, the contents control unit is a step of receiving content information which is information about the content that has been encrypted using the DRM from the local terminal The content information includes the content file itself and additional information of the content file ;
The content control unit decrypting the received content information;
The DRM content reproduction method comprising: the content control unit outputting the decrypted content information to the content reproduction unit. The content control unit further includes:
In order to decrypt the received content information,
Outputting a DRM key request signal for requesting a DRM key corresponding to the content to the server;
Receiving a DRM key output in response to the DRM key request signal from the server,
The content control unit decrypts the content information based on the received DRM key.
The DRM content reproduction method according to claim 4 . A DRM content playback method for a content playback unit to play back content, wherein the content playback unit requests the local terminal to request the content.
Output a first content request signal including a route and file name to the local terminal,
The DRM content playback method includes:
The method comprising the content control unit, hooking the first content request signal output from the content reproduction unit to the local terminal;
The method comprising the content control unit, based on the hooked first contents request signal, the content to be thus requested first contents request signal to determine whether or not present in the local terminal;
A result of the determination, if the content is not present in the local terminal, the contents control unit, the second content request signal including the file path of the content on the server, and output to the server, using the DRM content information which is information about the encrypted content, in step in response to the second content request signal received from the server, and outputs to the content reproduction unit to decrypt the content information with the received The content information includes the content file itself and additional information of the content file ,
If the content is present in the local terminal as a result of the determination, the content control unit receives the content information encrypted using DRM from the local terminal, and the received content information Decrypting and outputting to the content reproduction unit. A method for reproducing DRM content, comprising: A recording medium recording a program for executing steps of claims 1 to 6 DRM content reproduction method of any one claim to a computer. A DRM content playback device comprising a content playback unit for playing back content and a content control unit,
The content playback unit outputs a first content request signal including a path and file name of the content to the local terminal in order to request the content from the local terminal.
The content control unit
Hooking the first content request signal output from the content reproduction unit to the local terminal;
The second contents request signal including a file path of the content on the server, and output to the server;
Content information, which is information about the content encrypted using DRM , is received from the server in response to a second content request signal, and the content information includes the content file itself and additional information of the content file. ;
The content information is received, decrypted and output to the content reproduction unit ,
The content reproduction unit is configured to reproduce the content based on the decrypted content information,
The content control unit is configured to decrypt the content information.
Outputting a DRM key request signal for requesting a DRM key corresponding to the content to the server;
Receiving a DRM key output from the server in response to the DRM key request signal;
Configured to decrypt the received content information based on the received DRM key;
When the second content is called during playback of the content, the content playback unit includes a third content request signal including a path and a file name of the second content to request the second content from the local terminal. Is output to the local terminal.
Made,
The content control unit further includes:
Hooking the third content request signal;
A fourth content request signal including a file path of the second content at the server is output to the server;
Second content information that is encrypted information about the second content is received from the server in response to the fourth content request signal, and the second content information includes the content file itself of the second content and the second content information. Including additional information of the content file,
Receive and decode the second content information and output to the content reproduction unit
A DRM content playback apparatus configured as described above . The content providing device further outputs authentication information to the server to receive the DRM key from the server;
The DRM content reproduction apparatus according to claim 8 . The content control unit further determines whether the content requested by the first content request signal exists in the local terminal based on the hooked first content request signal, and, as a result of the determination, When the content exists in the local terminal, the content information is received from the local terminal, the received content information is decrypted, and the decrypted content information is output to the content reproduction unit To
The DRM content playback apparatus according to claim 9 .

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