KR100894900B1 - Method and apparatus for protecting digital contents by using display signal information - Google Patents

Abstract

A method for protecting digital contents by using display output signal information and an apparatus therefor are provided to prevent the digital contents, outputted through an analog device, from being stored by other devices. Firstly, the display output signal information of an analog device which is an external device connected to a client is obtained(S200). The obtained display output signal information is compared with pre-stored display output signal information. It is determined whether the obtained display output signal information is the TV(S202). If so, the reproduction of contents is interrupted(S204). But, if so, the contents is reproduced(S206).

Description

Method and apparatus for protecting digital contents using display output signal information {Method and apparatus for protecting digital contents by using display signal information}

The present invention relates to a method and device for protecting content, and more particularly, to a method and device for protecting digital content that can be output through a screen of analog devices such as a television.

The development of communication technologies such as the Internet and the development of digital devices such as computers have made it possible to acquire and store various digital contents.

However, due to the nature of digital content that is easy to store, transmit, and copy, digital content is frequently used or copied without legitimate authority.

To protect such digital content, various methods and technologies such as encryption of digital content itself and authentication for use of digital content have been developed.

However, these conventional methods of protecting digital content are merely ways to prevent duplication of digital content itself or to authenticate the use of legitimate owners.

Therefore, the conventional digital content protection method has a problem that it is difficult to prevent the digital content to be viewed when a large number of users watch using an analog device such as a television or store the digital content output from the analog device again using other devices.

For example, when watching a video lecture, if only one user registers as a member to receive the video lecture, and outputs the video lecture received through the screen of an analog device, the protection of the conventional digital content. There is a problem in that it is difficult to protect digital content.

In addition, there is a problem that it is difficult to prevent the digital content such as video lectures output through the analog device to be recorded again using another device, such as recording.

In order to solve the conventional problems as described above, the present invention proposes a method and apparatus for protecting digital content that can protect digital content even when digital content is output through an analog device.

In addition, the present invention proposes a method and device for protecting digital content that can prevent the digital content output through an analog device from being stored again using another device.

Still other objects of the present invention will be readily understood through the following description of the embodiments.

In order to achieve the above object, according to an aspect of the present invention there is provided a digital content protection method.

According to a preferred embodiment of the present invention, in the method of protecting digital contents performed in a client connected to an analog device, acquiring display output signal information of the analog device ( a); (B) comparing the obtained display output signal information with display output signal information of a preset analog device; the display output signal information of the preset analog device is displayed on the screen of the analog device; Display output signal information of the analog device to block output; And (c) blocking reproduction of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device. Is provided.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information of the analog device may be obtained at the client using the recognition of the analog device by the Plug and Play function of the client.

The display output signal information may be frequency information of the analog device.

In the step (c), when the obtained display output signal information corresponds to display output signal information of a preset analog device, the digital content may be blocked from being output to the analog device.

In the step (c), if the obtained display output signal information corresponds to display output signal information of a preset analog device, requesting to stop transmission of the digital content to a media server transmitting the digital content to the client. Can be.

According to another preferred embodiment of the present invention, in a content delivery system including a client (client) connected to an analog device and a media server for transmitting digital contents to the client A method of protecting digital content in a media server, the method comprising: receiving (a) display output signal information of an analog device connected to the client from the client; (B) comparing the obtained display output signal information with display output signal information of a preset analog device, wherein the display output signal information of the preset analog device is displayed on a screen of the analog device; Display output signal information of the analog device to block output; And stopping the transmission of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device. Is provided.

The display output signal information of the analog device may be obtained at the client using the recognition of the analog device by the Plug and Play function of the client.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information may be frequency information of the analog device.

The analog device connected with the client may be an analog television.

In step (c), if the obtained display output signal information corresponds to display output signal information of a preset analog device, transmitting a signal to block the output of the digital content to the analog device to the client. Can be.

In the step (c), when the obtained display output signal information corresponds to display output signal information of a preset analog device, a signal may be transmitted to the client to block the digital content from being played on the client. have.

According to another aspect of the present invention, a digital content protection device is provided.

According to a preferred embodiment of the present invention, a device for protecting digital contents, the apparatus comprising: a display output signal information acquisition unit for acquiring display output signal information of an analog device connected to a client; A display output signal information comparator for comparing the obtained display output signal information with display output signal information of a preset analog device—the display output signal information of the preset analog device is a screen reproduced by the client; Display output signal information of the analog device to block output through the device; And a content reproduction blocking unit for stopping the reproduction of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device as a result of the comparison of the display output signal information comparison unit. A protection device for digital content is provided.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information of the analog device may be obtained at the client using the recognition of the analog device by the Plug and Play function of the client.

The display output signal information may be frequency information of the analog device.

The content reproduction blocking unit may block output of the digital content to the analog device.

The content reproduction blocking unit may request the transmission of the digital content to the media server transmitting the digital content to the client.

According to another preferred embodiment of the present invention, in the device for protecting digital contents, the display output signal information of the analog device connected to the client received from the client (analog) is set in advance analog Display output signal information comparator comparing the display output signal information of the device ?? The display output signal information of the preset analog device is to block the screen reproduced by the client from being output through the screen of the analog device A display output signal information of; And a content transmission blocking unit for blocking transmission of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device as a result of the comparison of the display output signal information comparison unit. A protection device of the content is provided.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information of the analog device may be obtained at the client using the recognition of the analog device by the Plug and Play function of the client.

The display output signal information may be frequency information of the analog device.

The content transmission blocking unit may transmit a signal to block the output of the digital content to the analog device to the client.

The content transmission blocker may transmit a signal to the client to block the digital content from being played on the client.

According to another aspect of the present invention, there is provided a recording medium recording a program for implementing a method of protecting digital content.

According to a preferred embodiment of the present invention, a program of instructions executable by the client is implemented so that a method of protecting digital contents performed at a client connected to an analog device is implemented. A recording medium implemented and recording a program that can be read by the client, the method comprising: obtaining (a) display output signal information of the analog device; (B) comparing the obtained display output signal information with display output signal information of a preset analog device; the display output signal information of the preset analog device is displayed on the screen of the analog device; Display output signal information of the analog device to block output; And (c) blocking reproduction of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device. A recording medium is provided which records a program for implementation.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information of the analog device may be obtained at the client using the recognition of the analog device by the Plug and Play function of the client.

The display output signal information may be frequency information of the analog device.

In the step (c), when the obtained display output signal information corresponds to display output signal information of a preset analog device, the digital content may be blocked from being output to the analog device.

In the step (c), if the obtained display output signal information corresponds to display output signal information of a preset analog device, requesting to stop transmission of the digital content to a media server transmitting the digital content to the client. Can be.

According to another preferred embodiment of the present invention, in a content delivery system including a client (client) connected to an analog device and a media server for transmitting digital contents to the client In a recording medium on which a program of instructions that can be executed by the media server is implemented so as to implement a method of protecting digital content performed on a media server, the recording medium recording a program that can be read by the media server, (A) receiving display output signal information of an analog device connected to the client; (B) comparing the obtained display output signal information with display output signal information of a preset analog device; the display output signal information of the preset analog device is displayed on the screen of the analog device; Display output signal information of the analog device to block output; And (c) stopping the transmission of the digital content when the obtained display output signal information corresponds to display output signal information of a preset analog device. A recording medium is provided which records a program for implementation.

The digital content may be a download and play digital content stored in the client and then reproduced in the client.

The digital content may be a digital content of a streaming method that is reproduced in real time to the client.

The display output signal information of the analog device may be obtained at the client by using the recognition of the analog device by the Plug and Play function of the client.

The display output signal information may be frequency information of the analog device.

In step (c), if the obtained display output signal information corresponds to display output signal information of a preset analog device, transmitting a signal to block the output of the digital content to the analog device to the client. Can be.

In the step (c), when the obtained display output signal information corresponds to display output signal information of a preset analog device, a signal may be transmitted to the client to block the digital content from being played on the client. have.

As described above, the digital content protection method and apparatus using the display output signal information according to the present invention has an advantage of protecting the digital content even when the digital content is output through the analog device.

In addition, there is an advantage in that the digital content output through the analog device can be prevented from being stored again using another device.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the drawings, similar reference numerals are used for similar elements. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be.

On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art.

Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted.

First, a configuration of a content delivery system to which a digital content protection method according to an embodiment of the present invention can be applied will be described with reference to FIG. 1.

1 is a block diagram showing the configuration of a digital content transmission system to which the digital content protection method according to an embodiment of the present invention can be applied.

In the following description, for the convenience of description, unless otherwise specified, digital content and the terms digital content will be used without any distinction.

As shown in FIG. 1, a Contents Delivery Networks system according to a preferred embodiment of the present invention may include a TV 100, a client 110, and a media server 130.

Meanwhile, in FIG. 1, only one component is illustrated for convenience of description, but one or more components may be present.

In addition, although FIG. 1 illustrates the TV 100 as an analog device capable of outputting digital content through a screen, there is no limitation as long as it is an analog device capable of outputting a screen by a display output signal.

As a representative example of the display output signal, the analog device may be a frequency for the display output in the case of the TV 100 illustrated in FIG. 1.

The client 110 may be connected through the communication network 120 to access the media server 130 to receive digital content, and to output digital content through a screen of an analog device such as the TV 100 ( A device that contains connections such as ports) or terminals.

In addition, the client 110 may include a web browser (not shown) that allows access to the media server 130 and an application (not shown) required for playback when the content is played. It is apparent that the browser and the application may be installed in the form of a program on the client 110.

In addition, as an analog device such as the TV 100, a terminal for outputting digital content through a screen of the analog device may be, for example, an S-video terminal, but is not limited thereto.

The client 110 may be connected to the media server 130 having a communication function, may install a program capable of playing the received content, and may include a display screen on which the played content is output. In addition, there is no limitation as long as the device may include a connection unit capable of outputting a screen played by the client 110 to an analog device such as the TV 100.

The client 110 may include, for example, a wired / wireless terminal such as a user personal computer (PC), a mobile phone, a personal digital assistant (PDA), a portable multimedia player (PMP), and the like, but is not limited thereto. .

The client 110 is connected to the media server 130 via the communication network 120, the communication network 120 in the present invention includes not only online and mobile communication network, but also online to the TCP / IP protocol and its upper layer. Many services exist: Hyper Text Transfer Protocol (HTTP), Telnet, File Transfer Protocol (FTP), Domain Name System (DNS), Simple Mail Transfer Protocol (SMTP), Simple Network Management Protocol (SNMP), Network File (NFS) It includes all global open network architectures that provide services.

The mobile communication network also includes an access gateway that enables transmission and reception of wireless packet data in addition to a base station (BS), a mobile telephone switching office (MTSO), and a home location register (HLR). It further includes components such as a gateway, a packet data serving node (PDSN), and the like.

The media server 130 transmits the digital content to the client 110 and, although not illustrated in FIG. 1, may be connected to a database in which the digital content is stored.

The digital content provided by the media server 130 is not only streaming digital content played back in real time on the client 100 but also download and play downloaded and played on the client 100. There are no restrictions such as digital content.

In particular, in the case of download-and-play digital content, a number of DRM (Digital Rights Management) authentication methods and the like are applied to protect the digital content. In this case, the digital content is protected by the conventional DRM authentication method. The protection of digital content such as the protection of digital content can be more useful.

In addition, in the case of the streaming method, the digital content protection method according to the present invention can be further strengthened by using the digital content protection method according to the present invention together with various authentication and protection methods for protecting the conventional streaming content.

Meanwhile, although only the media server 130 is illustrated in FIG. 1, a web server (not shown) that inputs information necessary for authentication to a user through the client 110 and provides a web document that provides information on digital content is provided. It will be apparent to those skilled in the art that more may be included.

In such a content delivery network system, the digital content protection method according to the present invention can be implemented by various methods.

First, the client 110 acquires display output signal information of the analog device 100 connected with the client 110.

The acquisition of the display output signal information may first recognize the analog device in the client and obtain the display output signal information from the recognized analog device. In addition, the recognition of the analog device in the client may be performed by a Plug & Play function that can automatically recognize when a new device is connected.

On the other hand, when the display output signal information is obtained, the external output of the digital content is output through the screen of the analog device by using the obtained display output signal information.

Blocking the external output of the digital content can be made by various methods such as blocking at the client 110 and interruption of transmission of the digital content at the media server 130, and the blocking method is not limited.

On the other hand, it is also possible to selectively block the external output of the digital content using the obtained display output signal information.

For example, analog TV uses various methods such as NTSC (National Television System Committee), PAL (Phase Alternation by Line), SECAM (Sequential Color with Memory), and each method uses one frequency as one of the display output signals. Will be different.

In other words, in the case of analog TV, horizontal and vertical frequencies, image modulation frequencies, video bands, and audio modulation frequencies are different for each method, and different countries use different standard methods.

Taking advantage of the difference between these display output signals, for example, in the case of Korea, the NTSC method is used. Therefore, if there is a lot of group watching for video lectures in Korea, the NTSC display output signal information, that is, frequency information used in the NTSC method, is used. It is also possible to block the external output of the optional digital content, such as to block the output of the digital content to the external device only when is obtained from the client 110.

In addition, the media server 130 may selectively block the external output of the digital content by using the information of the client 110 or the user.

On the other hand, the blocking of the external output of the digital content is to block the output of the screen itself in the analog device connected to the client 110 and to stop the playback or transmission of the digital content itself, including the client 110 It is possible in various ways such as.

In particular, when digital content is played in a download and play manner, blocking the play of the digital content may be more effective in the digital protection method according to the present invention. Blocking the transmission of may be effective, but is not limited thereto.

Hereinafter, the order in which the digital content protection method is implemented according to an exemplary embodiment of the present invention will be described with reference to FIGS. 2 and 3.

FIG. 2 illustrates a case in which the client 110 acquires display output signal information and uses the obtained display output signal information to determine that the external output or playback of the content is stopped to protect the content. FIG. 110 illustrates an example in which only display output signal information is acquired and transmitted to the media server 130, and the media server 130 determines to stop the external output or playback of the content to protect the content.

As shown in FIG. 2, when the display 110 acquires display output signal information and protects digital content, the load of the media server 130 may be reduced, but the load on the client 110 may be increased. Can be.

On the other hand, as shown in FIG. 3, when only the display output signal information is acquired by the client 110 and transmitted to the media server 130, and the method for protecting digital content is performed by the media server 130, Although it is possible to reduce the load and to selectively protect the digital content according to the type of digital content, the type of the client 110 or the user, and the external device connected to the client 110, the media server 130 ) May be increased.

First, a method of protecting digital content according to the present invention will be described with reference to FIG. 2.

2 is a flowchart illustrating a sequence of implementing digital content protection method according to an embodiment of the present invention.

As shown in FIG. 2, first, display output signal information of an analog device, which is an external device connected to the client 110, is obtained (S200).

Acquiring the display output signal information may be performed by the plug and play function as described above, but is not limited thereto.

The obtained display output signal information is compared with previously stored display output signal information to determine whether the acquired display output signal information is, for example, a TV which is a representative analog screen output device (S202).

If it is determined that the TV content is blocked (S204), if not the TV content is played (S206).

In FIG. 2, the content is protected as the content is blocked by the client, and the content is blocked. However, as described above, the content protection in the client 110 is continuously performed, but the TV 100 is protected. It is apparent that the present invention can be implemented in various ways, such as blocking output to an external device such as or requesting to stop transmission of digital content to the media server 130.

In FIG. 2, the client 110 acquires the display output signal information and protects the digital content. However, as described above, only the display output signal information is obtained from the client 110 and transmitted to the media server 130. The media server 130 may also perform a method for protecting digital content. In this case, the order in which the method for protecting digital content according to the present invention is performed will be described with reference to FIG. 3.

3 is a flowchart illustrating a sequence of implementing digital content protection method according to another preferred embodiment of the present invention.

As shown in FIG. 3, first, display output signal information of the analog device 100 connected to the client 110 is obtained from the client 110 (S300), and the obtained display output signal information is transferred to the media server 130. It transmits (S302).

Meanwhile, the acquisition of the display output signal information may be performed using the recognition of the analog device by the plug and play function for recognizing the device connected to the client as described above, but is not limited thereto.

The media server 130 determines whether the acquired display output signal information is, for example, the TV 100 which is a representative analog screen output device by comparing the obtained display output signal information with previously stored display output signal information (S304). ).

As a result of the determination, if it is not the TV 100, the content is transmitted to the client 110 (S306), and the transmitted content is reproduced in the client 110 (S308).

As a result of determination, in the case of the TV 100, the transmission of the content to the client 110 is stopped, and in this case, the content transmission impossible signal is transmitted to the client 110 (S310). Can be displayed.

On the other hand, the digital content protection method according to the present invention may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

Hereinafter, a configuration of an apparatus capable of implementing the digital content protection method according to the present invention will be described with reference to FIGS. 4 and 5.

4 is a block diagram showing the configuration of a content protection module that can be installed in the client 110 to implement the digital content protection method according to an embodiment of the present invention.

On the other hand, it is apparent that the content protection module may be installed in the form of a program on the client 110 or may be configured as a separate device.

FIG. 4 illustrates a configuration of a content protection module when the client 110 acquires display output signal information and determines that the output or playback of the content is stopped by using the obtained display output signal information. It is illustrated.

As shown in FIG. 4, the content protection module according to the present invention may include a display output signal information acquisition unit 400, a display output signal information comparison unit 410, and a content reproduction blocking unit 420.

The display output signal information acquisition unit 400 is connected to the client 110 to obtain display output signal information of an analog device capable of outputting a screen reproduced by the client 110. Such display output signal information may be input from the original function of a program installed in the client 110, for example, information of an analog device obtained by a plug and play function, and may be obtained by other methods. It is also possible.

The display output signal information comparator 410 compares the display output signal information acquired by the display output signal information acquisition unit 400 with the display output signal information of a preset analog device.

It is determined whether the display output signal information obtained through the comparison in the display output signal information comparison unit 410 is, for example, the TV 100, which is a representative analog device.

The content reproduction blocking unit 420 blocks the reproduction of the received digital content when the TV is a result determined by the display output signal information comparing unit 410.

In FIG. 4, the reproduction of digital content is exemplified. However, preventing the digital content from being output to the analog device may be a method of blocking the screen output from the analog device connected to the client 110 and the client 110. ) Can be stopped in a variety of ways, such as to stop the playback of the content or the transmission of the content itself in the media server 130, and the method is not limited.

Meanwhile, although not shown in FIG. 4, the content protection module according to the present invention may further include a display output signal information storage unit (not shown) in which display output signal information of analog devices for blocking external output of digital content is stored. Can be.

5, in the above-described embodiment, the client 110 acquires only the display output signal information, transmits the information to the media server 130, and stops the output or playback of the content by using the display output signal information obtained from the media server 130. In the case of determining the content to protect the content, the configuration of the content protection device is illustrated.

On the other hand, the content protection device may be installed in the form of a program in the media server 130 or may be configured as a separate device that can be connected to the media server 130.

5 is a block diagram showing the configuration of a content protection device for implementing the digital content protection method according to another embodiment of the present invention.

As shown in FIG. 5, the content protection device for implementing the digital content protection method according to another exemplary embodiment of the present invention may include a display output signal information comparison unit 500 and a content reproduction blocking unit 510. have.

The content protection device according to the present invention first receives display output signal information of an analog device connected to the client 110 from the client 110. Such display output signal information may be made by a communication unit (not shown) that may be included in the content protection device according to the present invention.

The display output signal information comparison unit 500 compares the received display output signal information with the display output signal information of a preset analog device as described in FIG. 4.

The display output signal information obtained through the comparison in the display output signal information comparator 500 determines, for example, whether the TV 100 is a representative analog device.

The content transmission blocking unit 510 blocks the transmission of the content to the client 110 when the TV 100 is determined as the result of the display output signal information comparison unit 500.

In FIG. 5, the transmission of digital content is exemplified. However, the digital content is not output to the analog device connected to the client 110. The method of blocking and the method of stopping the playback of the content in the client 110 can be made in various ways, and the method is not limited.

On the other hand, the content protection device according to the present invention can be connected to the display output signal information database that stores the display output signal information of the analog device for blocking the external output of the digital content.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1 is a block diagram showing the configuration of a digital content transmission system that can be applied to the digital content protection method according to an embodiment of the present invention.

2 is a flow chart showing the order in which the digital content protection method is implemented according to the first preferred embodiment of the present invention.

3 is a flow chart showing the order in which the digital content protection method is implemented according to the second preferred embodiment of the present invention.

4 is a block diagram showing the configuration of a content protection module that can be installed in a client to implement the digital content protection method according to the first embodiment of the present invention.

5 is a block diagram showing the configuration of a content protection device for implementing the digital content protection method according to another embodiment of the present invention.

Claims (22)

A method of protecting digital content in a client performed by blocking a display of digital contents from being displayed on a screen of the analog device in a client connected to an analog device, Acquiring frequency information from the analog device to cause a screen of the analog device to be displayed; (B) comparing the obtained frequency information with preset frequency information; And Blocking (c) the reproduction of the digital content when the obtained frequency information corresponds to preset frequency information as a result of the comparison. In the content delivery system including a client connected to an analog device and a media server for transmitting digital contents to the client, the screen on which the digital content is played on the client is displayed. In the method of protecting digital content in the media server performed by blocking the display on the screen of the device, Receiving (a) frequency information of the analog device obtained at the client from the client; (B) comparing the obtained frequency information with preset frequency information; And Stopping the transmission of the digital content if the obtained frequency information corresponds to preset frequency information. delete delete The method according to claim 1 or 2, In step (a), Frequency information of the analog device is obtained from the client using the recognition of the analog device by the Plug and Play function of the client. delete The method of claim 1, In step (c), And if the obtained frequency information corresponds to display output signal information of a preset analog device, blocking the digital content from being output to the analog device. The method of claim 1, In step (c), If the obtained frequency information corresponds to frequency information of a preset analog device, requesting to stop transmission of the digital content to a media server that transmits the digital content to the client. . The method of claim 2, In step (c), If the obtained frequency information corresponds to frequency information of a preset analog device, transmitting a signal to block the output of the digital content to the analog device to the client. . The method of claim 2, In step (c), And if the obtained frequency information corresponds to frequency information of a preset analog device, transmitting a signal to the client to block the digital content from being played on the client. Digital to protect the digital content in the client, which is performed by blocking the display of the digital contents on the client connected to the analog device to be displayed as the screen of the analog device. In the protection device of the content, A display output signal information acquisition unit for acquiring frequency information for displaying a screen of the analog device from the analog device; A display output signal information comparing unit comparing the obtained frequency information with preset frequency information; And And a content reproduction blocker for stopping the reproduction of the digital content when the obtained frequency information corresponds to preset frequency information as a result of the comparison of the display output signal information comparator. Digital to protect the digital content in the client, which is performed by blocking the display of the digital contents on the client connected to the analog device to be displayed as the screen of the analog device. In the protection device of the content, A display output signal information comparison unit for comparing the frequency information of the analog device obtained by the client to the screen of the analog device received by the protection device of the digital content with preset frequency information; And And a content transmission blocker which blocks the transmission of the digital content when the received frequency information corresponds to preset frequency information as a result of the comparison of the display output signal information comparator. delete delete The method according to claim 11 or 12, wherein Frequency information of the analog device is obtained by the client using the recognition of the analog device by the Plug and Play (Plug and Play) function of the client. delete The method of claim 11, The content playback blocker, And prevent the digital content from being output to the analog device. The method of claim 11, The content playback blocker, And requesting to stop transmission of the digital content to a media server that transmits the digital content to the client. The method of claim 12, The content transmission blocking unit, And transmitting a signal to the client to block the digital content from being output to the analog device. The method of claim 12, The content transmission blocking unit, And send a signal to the client to block the digital content from being played on the client. To implement a method of protecting digital content in the client, which is performed by blocking a display of digital contents from being displayed on a screen of the analog device in a client connected to an analog device. A recording medium in which a program of instructions executable by the client is implemented and which records a program that can be read by the client, Acquiring frequency information from the analog device to cause a screen of the analog device to be displayed; (B) comparing the obtained frequency information with preset frequency information; And Blocking (c) reproducing the digital content if the obtained frequency information corresponds to preset frequency information, and recording the program for implementing the method for protecting the digital content. . In the content delivery system including a client connected to an analog device and a media server for transmitting digital contents to the client, the screen on which the digital content is played on the client is displayed. A program of instructions that can be executed by the media server is implemented so that the method of protecting digital content in the media server, which is performed by blocking the display on the screen of the device, is implemented and can be read by the media server. In the recording medium recording the Receiving (a) frequency information of the analog device obtained at the client from the client; (B) comparing the obtained frequency information with preset frequency information; And (C) stopping the transmission of the digital content when the obtained frequency information corresponds to preset frequency information as a result of the comparison. .

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