KR20090001479A - Intermediate trading system of digital contents and used contents and method thereof - Google Patents

Abstract

A system and a method for relaying digital contents and used digital contents by deleting or controlling use right between a seller and a client are provided to enable the seller and a buyer to transact the digital contents safely and conveniently by strengthening security for personal information protection and the contents in the system connecting a plurality of contents service systems. A seller terminal(300) provides digital contents and a buyer terminal(400) buys the digital contents. At least one contents service server(200) provides the digital contents to the buyer terminal. A connection relay server(100) authenticates user login of the buyer and/or seller terminal, and relays DRM(Digital Rights Management) transaction of the digital contents.

Description

Intermediate trading system of digital contents and used contents and method

1 is a block diagram schematically showing a digital content transaction relay system according to a preferred embodiment of the present invention.

FIG. 2 is a block diagram schematically illustrating a relationship between one content service server and other components in the digital content transaction relay system of FIG. 1.

3 is a diagram schematically illustrating a login process to a relay server and a content service server in the digital content transaction relay system of FIG. 1.

4 is a diagram schematically illustrating a registration process of digital content to be sold in the digital content transaction relay system of FIG. 1.

FIG. 5 is a diagram schematically illustrating a purchase process of digital content in the digital content transaction relay system of FIG. 1.

FIG. 6 is a diagram schematically illustrating a process of moving digital content to which DRM is applied between different storage media in a buyer terminal in the digital content transaction relay system of FIG. 1.

<Description of Symbols for Main Parts of Drawings>

1: digital content transaction relay system,

100: access relay server, 110: login authentication server,

120: relay server, 130: DRM server,

200: a content service server, 300: a seller terminal,

400: Buyer terminal.

The present invention relates to a digital content transaction relay and used content transaction system and method thereof, and more particularly, when a right to use digital content is transferred from a seller to a buyer via a relay server, the content and its right to be used in the seller's system. Digital content transaction relay and used content transaction system and method for ensuring the stability of digital content e-commerce by deleting the data in a non-recoverable manner and controlling all access to the use rights by the client (seller or buyer computer) program. .

As computer technology advances and becomes popular, most commercial works (books, comics, records, movies, broadcasts, newspapers, etc.) that were produced, stored, and managed in analog form are becoming digital.

Infinite repetition, the original quality is completely undamaged (persistent high quality), easy to copy and modify, and high-speed communication network enables the transmission and distribution of even a large amount of work in a short time. The features and advantages of digital, such as easy to transfer and distribute, are rapidly digitizing analogue works.

However, this digital advantage also acts as a violation of the original author's rights and interests in the work. Even if you have a copy, it is the same as the original, which weakens your willingness to purchase the original, and it is easy to steal the copyrighted work because it is easy to modify and copy without the author's consent. It can spread quickly and make legal control impossible.

These negative factors can reduce the morale of the authors and reduce their willingness to produce them, which in turn can cause hesitation. Therefore, for digital works, there is a need for a technical protection device that can effectively manage copyright while fully utilizing the advantages of digital.

On the other hand, in the digital content trading system using DRM technology, if the user who paid the right price and received the digital content and the right to use it is determined that the use is not necessary or necessary, the file and the use of the digital content format are used. There is a need for a way to resell, transfer, or provide rights to another user.

In addition, it is estimated that the dormant digital content market, which is not used in Korea in the year, reaches 4 trillion won.

Therefore, it will be necessary to buy and sell the digital content and the right to use the same as buying and selling used goods. This would be a form of buying and selling of digital content.

Meanwhile, in the conventional DRM technology, a stable device and a method for managing content encryption keys and license information so that only license holders can obtain license information have not been presented.

In addition, in the conventional digital content transaction relay system, there is a limit to relaying various types of digital content and various types of transaction systems into one so that both sellers and buyers can safely and conveniently buy and sell copyright-protected digital content. there was.

The present invention provides a digital content transaction relay and second-hand content transaction system that can be securely and conveniently traded by both sellers and buyers by strengthening the protection of personal information and contents in a transaction relay system connecting a plurality of content service systems; It aims to provide the method.

The present invention provides a terminal for providing digital content; A buyer terminal for purchasing the digital content; At least one content service server for supplying the buyer terminal with digital content provided from the seller terminal or provided by itself; And an access relay server for authenticating a user login from the seller terminal and / or the buyer terminal and relaying a DRM transaction of the digital content.

The relay server provides a login authentication server for authenticating user logins from the seller terminal and / or the purchaser terminal, and providing a means for accessing the content service server to a user whose user login authentication is completed. And a DRM server for granting a DRM authentication key or updating a DRM authentication key to the digital content provided through the content service server.

The content service server, a login control unit for requesting the content service server login authentication key to the login authentication server by a user login request through the relay server, and a DRM requesting granting or updating of the DRM authentication key to the DRM server. A control unit, a sales control unit for controlling the sale registration of the digital content from the seller terminal, and a purchase control unit for controlling the purchase of the digital content from the buyer terminal.

Preferably, the buyer terminal includes a DRM authentication unit for updating the DRM authentication key of the digital content, and a DRM movement control unit for controlling the movement of the digital content stored in the first storage medium to the second storage medium. Do.

Another aspect of the invention includes the steps of (a) authenticating a user login from a seller terminal and / or a buyer terminal to a relay server; (b) authenticating a login to a content service server through the relay server; (c) registering digital content to be sold from the seller terminal in the content service server; (d) providing a digital content transaction relay method comprising the step of purchasing the digital content from the content service server through DRM authentication.

In step (b), logging in to the relay server from the seller terminal and / or the buyer terminal, selecting a content service server to be connected from among at least one or more content service servers, and to the content service server. Preferably, the method includes providing a content service server login authentication key for authenticating the login.

In step (c), the seller terminal receives a request for selling registration of the digital content to be sold together with the DRM authentication key for the DRM authentication, verifying the DRM authentication key, and selling the content service server. And checking the presence or absence of digital content to be sold, and deleting and / or disabling the digital content to be sold.

In step (d), selecting digital content to be purchased from among digital contents in the content service server, receiving payment for the digital content to be purchased, and updating the DRM authentication key of the digital content to be purchased. And providing the digital content to be purchased and the DRM authentication key.

Selecting digital content to be moved in a first storage medium, importing the digital content to be moved from the first storage medium together with a DRM authentication key, selecting a second storage medium, and updating the DRM authentication key The method may further include storing the digital content on the second storage medium together with the DRM authentication key.

According to the present invention, in a transaction relay system connecting a plurality of content service systems, the protection of personal information and supplementation of contents are enhanced, so that both sellers and buyers can safely and conveniently trade.

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

Figure 1 schematically shows a digital content transaction relay system 1, which is a preferred embodiment according to the present invention. FIG. 2 is a block diagram schematically illustrating a relationship between one content service server and other components in the digital content transaction relay system 1.

Referring to the drawings, the digital content transaction relay system 1 includes a connection relay server 100; Content service server 200; Seller terminal 300; And a purchaser terminal 400. In the digital content transaction relay system 1, at least one or more content service servers 200 may be provided, and the plurality of content service servers 200 may be connected and connected to each other through one connection relay server 100. Make sure Therefore, the connection and management of the plurality of content service servers 200 can be facilitated.

In addition, when the connection relay server 100 and the content service server 200 is connected to each of the separate login authentication key to be given, and through this it is possible to log in, thereby connecting the plurality of content service server 200 In addition, security management can be strengthened and security management can be facilitated.

In addition, when the digital content transaction relay system 1 determines that a user who pays a fair price in a digital content transaction system using a DRM technology and receives and uses the digital content and the use right thereof is determined that its use is not necessary or necessary, How to trade digital content securely by trader and seller using a login authentication system that can resell, transfer, and provide files of digital content format and usage rights to other users again and other digital content service system And a used content trading method system.

In addition, a security application technology that allows users to log in to various digital content service websites or multiple content service systems on the Internet with a single login at the beginning, allows users to conveniently trade digital content. Provide services, including. To this end, the seller and the buyer are automatically logged in to the service with a trusted authentication key by performing one password and one login.

Thus, sellers and buyers do not need to memorize or memorize numerous passwords to sell and buy digital content, which is convenient and improves user productivity.

The access relay server 100 authenticates the user login from the seller terminal 300 and / or the purchaser terminal 400 and relays the DRM transaction of the digital content. The content service server 200 supplies digital content provided from the seller terminal 300 or provided by the seller terminal 300 to the purchaser terminal 400, and at least one or more is preferably provided. The seller terminal 300 provides digital content. The purchaser terminal 400 purchases digital content.

The access relay server 100 includes a login authentication server 110, a relay server 120, and a DRM server 130 to authenticate user logins from the seller terminal 300 and / or the purchaser terminal 400. To relay DRM transactions for digital content.

The login authentication server 110 authenticates the user login from the seller terminal 300 and / or the purchaser terminal 400. The relay server 120 provides the access means 121 to access the content service server to the user whose user login authentication is completed. The DRM server 130 grants a DRM authentication key or updates a DRM authentication key to digital content provided through the content service server 200.

The login authentication server 110 authenticates the login of each of the relay server 120 and the content service server 200 from the seller terminal 300 and / or the purchaser terminal 400. To this end, the login authentication server 110 provides a relay server login authentication key for authenticating the login to the relay server 120, and a content service server login authentication key for authenticating the login to the content service server 200.

The content service server login authentication key is provided by the login authentication server 110 at the request of the content service server connected through the access unit 121 of the relay server 120. Therefore, the user can be connected to the content service server by one login procedure to the relay server 120.

The content service server 200 includes a login control unit 210, a DRM control unit 220, a sales control unit 230, and a purchase control unit 240 to purchase digital content provided from the seller terminal 300. 400). In this case, the digital content may be provided from the seller terminal 300, but the present invention is not limited thereto and may be produced and provided by the content service server 200.

In addition, the digital content may be content to which DRM is applied or content to which DRM is not applied. In the case of DRM-applied content, DRM information is received at the time of sale and / or purchase to update the confirmation and / or DRM authentication key. In addition, DRM authentication key is newly generated at the time of purchase and provided together with the digital content to the content not applied to the DRM.

The login controller 210 requests the content service server login authentication key from the login authentication server 110 by a user login request through the relay server 120. The DRM control unit 220 requests the DRM server 130 to grant a DRM authentication key or request an update thereof.

The sales control unit 230 controls sales registration of the digital content according to an input from the seller terminal 300. The purchase controller 240 controls the purchase of the digital content according to the input from the purchaser terminal 400.

The sales control unit 230 includes a first sales control unit 231 and a second sales control unit 232 to control the sales registration of the digital content according to whether the digital content registered for sale is applied to the DRM. Digital content may be classified into first digital content and second digital content according to whether DRM is applied. The first digital content is digital content without DRM, and the second digital content is digital content with DRM.

4 illustrates a seller terminal 1 (300a) for registering and selling first digital content to which a DRM is not applied to a seller terminal, and a seller terminal (2300b) for registering and selling second digital content to which a DRM is applied.

The first sales control unit 231 controls the sale registration of the first digital content. The second sales control unit 232 controls the sale registration of the second digital content. At this time, the DRM server 130 grants a new DRM authentication key for the first digital content, and updates the DRM authentication key for the second digital content.

The first sales control unit 231 registers the sale of the first digital content from the seller terminal 1 300a without verifying a separate DRM authentication key. When the second digital content is registered for sale from the seller terminal 2 300b, the second sales control unit 232 deletes the second digital content from the seller terminal 2 300b and / or the DRM authentication key for the second digital content. It is deleted.

The seller terminal 300 provides digital content by the method shown in FIG. 4. The purchaser terminal 400 purchases digital content by the method shown in FIG.

The digital content may be any one or more of an avatar, an audio file, a video file, a mobile phone ringtone, and a document.

Also, digital content, music files, video files, pictures, images, photos, documents, user-generated digital content, mobile coloring, mobile lettering, mobile ringtones, landline coloring, landline phone lettering, e-book digital content, education or At least one of the learning digital content, knowledge content, coupons, games, fortune telling, lottery tickets, cartoons, news, and shopping information.

In this case, the digital content may be used digital content that is re-sold after the user legitimately purchases the DRM-applied content.

The seller terminal 300 and / or the purchaser terminal 400 may include a laptop, a personal computer, an Internet TV, an offline store point of sale (POS) system, a navigation system, a portable game machine, a wireless LAN terminal, a mobile phone, and a video game machine. It can be at least one or more.

Connection relay server 100; Content service server 200; Seller terminal 300; Each purchaser terminal 400 may be connected through a communication network. In this case, at least one or more of an Internet communication network, a WiBro communication network, a cable TV, a DMB network, and an Internet TV network may be used.

Meanwhile, the access relay server and / or the content service server may be implemented as a web site domain implemented on the Internet. In this case, the login controller, the DRM controller, the sales controller, and the purchase controller are preferably implemented as an agent program in the form of ActiveX.

Even if a user is registered only to the access relay server and not a member of the content service server, the user can access the content service server through the access relay server while maintaining security.

According to the present invention, service operators and administrators can centrally manage accounts and reduce duplication of customer information and waste of system resources. In addition, centralized integration of accounts avoids information inconsistencies between systems. Systematic enterprise access management enables effective application of security policy, and can provide access environment of secure information technology system with enhanced encryption authentication than ID / Password using plain text.

In addition, the system is highly compatible by providing various server environments and OS. Each control unit is provided as an Active Agent, which can be easily installed on the PC of the seller and the purchaser, and can be accessed through the same interface to the web service or content service system. Stable network security authentication protocol is extended to perform service login verification once more, making it more secure in hacking accidents.

When the relay server and the content server log in, the user's password is not transmitted to the server through the network in any form (encryption), and the user's password is secured by applying the password authentication method of the corresponding system.

The authentication server implemented in parallel distributed environment can authenticate about 100 users per second, and as the number of users increases, it can be easily extended by physically expanding the authentication server.

By integrating disparate networks of “system login integration across heterogeneous digital content services platforms,” management efforts can be consolidated. In this way, the best way to manage digital content transaction relay system and digital content transaction security policy can be promoted consistently.

3 illustrates a login process to the relay server 120 and the content service server 200, a registration process of digital content to be sold is illustrated in FIG. 4, and a purchase process of digital content is illustrated in FIG. 5.

Referring to the drawings, the digital content transaction relay method according to an embodiment of the present invention, the relay server login authentication step and the content service server login authentication step shown in Figure 3; A digital content registration step for sale shown in FIG. 4; It has a DRM authentication purchase step of the digital content shown in FIG. The digital content transaction relay method according to the present embodiment is performed by the method performed in the digital content transaction relay system shown in FIG. 1.

In the relay server login authentication step, the user login from the seller terminal 300 and / or the purchaser terminal 400 to the relay server 120 is authenticated. The content service server login authentication step authenticates the login to the content service server 200a through the relay server 120. In the relay server login authentication step and the content service server login authentication step, a login authentication key is provided by attempting to log in to the login authentication server 110 from the seller terminal 300 and / or the purchaser terminal 400, respectively.

In the digital content registration step for sale, the digital content to be sold from the seller terminal 300 is registered in the content service server 200a. In the DRM authentication purchase step of the digital content, the digital content is purchased from the content service server 200a through DRM authentication.

In the relay server login authentication step, the relay server login authentication key for authenticating the login to the relay server 120 is provided. To this end, the user attempts to log in to the login authentication server 110 from the seller terminal 300 and / or the purchaser terminal 400 and requests a login authentication key for logging in to the relay server. At this time, the user sends the user name and password to the login authentication server 110 to receive the user authentication.

Next, a login authentication key for the relay server login is provided from the login authentication server 110 to the seller terminal 300 and / or the purchaser terminal 400 to permit the relay server login.

The content service server login authentication step may include logging in to the relay server 120 from the seller terminal 300 and / or the purchaser terminal 400, and among the at least one content service server 200, a content service server to be accessed ( 200a) is selected, and providing a content service server login authentication key for authenticating login to the content service server 200a.

In the content service server login authentication step, a relay server login authentication key for authenticating a login to the content service server 200a through the relay server 120 is provided. To this end, the user logs in to the relay server 120 with the relay server login authentication key from the seller terminal 300 and / or the purchaser terminal 400. Next, the content service server 200a to be accessed is selected and an attempt is made to log in to the content service server 200a.

Accordingly, the content service server 200a requests a login authentication key for logging in to the content service server from the login authentication server 110, and the login authentication server 110 checks the relay server login authentication key and logs in to the content service server. The authentication key is provided to the content service server 200a. Accordingly, when the content service server 200a provides the content service server login authentication key to the seller terminal 300 and / or the purchaser terminal 400, the content service is provided from the seller terminal 300 and / or the purchaser terminal 400. Login to the server 200a is successful.

In the digital content registration step for sale, the digital content to be sold from the seller terminal 300 is registered in the content service server 200a. To this end, the step of registering digital content to sell includes receiving a request for selling registration of digital content to be sold together with a DRM authentication key for DRM authentication from a seller terminal 300, verifying a DRM authentication key, and a content service server ( Checking the presence or absence of digital content to be sold at 200a), uploading the digital content to be sold to the content service server, and deleting and / or disabling the digital content to be sold.

In the step of registering digital content to be sold, there may be a case of registering sales of first digital content to which DRM is not applied from seller terminal 1 (300a) and selling of second digital content to which DRM is applied from seller terminal 2 (300b).

When selling and registering the first digital content to which the DRM is not applied from the seller terminal 1 (300a), the content service server (1) does not apply the first digital content to which the DRM is not applied without verifying the DRM authentication key. 200a) to register the first digital content for sale. At this time, the content service server 200a provides the content sale registration completion information to the seller terminal 1 (300a).

When selling and registering the second digital content to which DRM is applied from seller terminal 2 (300b), first, the DRM authentication key for DRM authentication is sent from the seller terminal 2 (300b) to the content service server (200a). Request sales registration of content. Next, the DRM server 130 verifies whether the DRM authentication key is valid.

To this end, the content service server 200a first sends a DRM authentication key to the DRM server 130 to request verification of the DRM authentication key, and the DRM server 130 verifies the DRM authentication key to the content service server 200a. To pass. At this time, if the DRM authentication key is valid, the DRM authentication key is updated.

Next, the presence or absence of digital content to be sold to the content service server 200a is checked. At this time, if there is no digital content to sell in the content service server 200a, the digital content to be sold is uploaded from the seller terminal 2 300b to the content service server 200a. If there is digital content to sell on the content service server 200a, there is no need to upload digital content to sell.

Next, the digital content uploaded from the seller terminal 2 300b is deleted and / or the DRM authentication key is invalidated from the seller terminal 2 300b to stop the use of the uploaded digital content. To this end, the content service server 200a requests the seller terminal 2 (300b) to delete the content and / or stop using the content, and when the operation is completed in the seller terminal 2 (300b) from the seller terminal 2 (300b) content service server In step 200a, the content deletion and / or discontinuation message is sent. Accordingly, the registration completion information is transmitted from the content service server 200a to the seller terminal 2 300b.

In the DRM authentication purchase step of the digital content, the user purchases the digital content from the content service server 200a through the purchaser terminal 400 through DRM authentication. To this end, the DRM authentication purchasing step of the digital content includes a digital content selection step to be purchased, a preview step, a purchase price payment step, a DRM authentication key update step, and a DRM authentication key providing step.

In the digital content selection step to be purchased, digital content to be purchased is selected from among digital contents in the content service server 200a.

In the preview step, preview information of the digital content selected from the digital contents of the content service server 200a is provided. To this end, the user selects a preview in the content service server 200a through the purchaser terminal 400, and accordingly, the content service server 200a provides the preview information to the user through the purchaser terminal 400. Next, the user requests the purchase of the selected digital content to the content service server 200a through the purchaser terminal 400.

Next, in the purchase price payment step, the user pays the purchase price for the digital content to be purchased to the content service server 200a through the purchaser terminal 400. Accordingly, the digital content to be purchased from the content service server 200a to the purchaser terminal 400 and the updated DRM authentication key are provided. In addition, purchase completion information is transmitted from the content service server 200a to the purchaser terminal 400.

Next, the content service server 200a pays the selling price to the seller through the seller terminal 300 and provides the sale completion information. Next, the content service server 200a pays a relay fee to the access relay server 100.

In the digital content transaction relay method according to the present embodiment, at least one or more preferably, the plurality of content service servers 200 may be connected and connected through one connection relay server 100. Therefore, the connection and management of the plurality of content service servers 200 can be facilitated.

In addition, when the connection relay server 100 and the content service server 200 is connected to each of the separate login authentication key to be given, and through this it is possible to log in, thereby connecting the plurality of content service server 200 In addition, security management can be strengthened and security management can be facilitated.

FIG. 6 illustrates a process of moving digital content to which DRM is applied between different storage media 430 and 433 in the purchaser terminal 400.

Referring to the drawings, at least one or more storage media 431, 432, 433, 434 may be connected to the purchaser terminal 400. One or more of the storage media 431, 432, 433, 434, for example, a hard disk 431 may be included in the purchaser terminal 400 by default.

The storage medium 431, 432, 433, 434 can be a hard disk 431, a CD or DVD 432, a removable disk 433, a mobile player 434, or the like, and the mobile player 434 is a removable mp3. Player, video player, DVD player, and the like.

The purchaser terminal 400 may move the digital content to which the DRM is applied, from the first storage medium, for example, the hard disk 431, to the second storage medium, for example, the removable disk 433.

The purchaser terminal 400 includes a DRM authentication unit 410 and a DRM movement control unit 420. The DRM authentication unit 410 updates the DRM authentication key of the digital content. The DRM movement controller 420 controls the movement of the digital content stored in the first storage medium 431 to the second storage medium 433.

The DRM movement control unit 420 obtains the digital content and the DRM authentication key corresponding to the digital content from the first storage medium 431, requests the DRM authentication unit 410 to update the DRM authentication key, and then updates the second DRM authentication key. The digital media and the DRM authentication key are deleted from the first storage medium 431.

The digital content to which the DRM is applied in the digital content transaction relay method includes a digital content selection step, a digital content import step, a storage medium selection step to be moved, a DRM authentication key update step, and a digital content storage step.

In the digital content selection step, the first storage medium 431 is selected as the source storage medium in which the digital content is stored, and the digital content to be moved in the first storage medium 431 is selected. In the importing of digital content, the digital content to be moved from the first storage medium 431 is imported together with the DRM authentication key.

In the step of selecting a storage medium to be moved, the second storage medium 433 is selected as a target storage medium for newly storing digital content. In the DRM authentication key update step, the DRM authentication key is updated to be stored in the second storage medium 433. To this end, the DRM movement controller 420 requests the DRM authentication unit 410 to update the DRM authentication key. Accordingly, the DRM authentication unit 410 updates the DRM authentication key and provides it to the DRM movement control unit 420.

In the digital content storing step, the DRM movement control unit 420 stores the digital content in the second storage medium 433 together with the DRM authentication key.

Accordingly, the purchaser terminal 400 may move the DRM authentication file between different storage media without being connected to a separate external DRM server.

On the other hand, when a purchaser wants to move digital content and usage rights to optical discs such as CD / DVD / HDCD and portable play, the system cannot copy or move if the system does not support the device.

However, the present invention can copy and move digital content and manage and control these functions regardless of the compact disc and the device device of the portable player.

According to the digital content transaction relay and used content transaction system and method thereof according to the present invention, in the transaction relay system connecting a plurality of content service systems, the protection of personal information and the supplementation of the content are strengthened, so that both the seller and the buyer are safe and convenient. You can trade.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely an example, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I can understand. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (27)

Seller terminal for providing digital content; A buyer terminal for purchasing the digital content; At least one content service server for supplying the buyer terminal with digital content provided from the seller terminal or provided by itself; And And a connection relay server for authenticating a user login from the seller terminal and / or the buyer terminal and relaying a DRM transaction of the digital content. The method of claim 1, The connection relay server, Login authentication server for authenticating the user login from the seller terminal and / or the buyer terminal, A relay server providing access means for accessing the content service server to a user whose user login authentication is completed; and And a DRM server for granting a DRM authentication key or updating a DRM authentication key to the digital content provided through the content service server. The method of claim 2, The digital content transaction relay and used content transaction system, wherein the login authentication server provides a relay server login authentication key for authenticating the login to the relay server and a content service server login authentication key for authenticating the login to the content service server. . The method of claim 3, The content service server, A login controller which requests the content service server login authentication key from the login authentication server by a user login request through the relay server; A DRM controller for requesting granting or updating of the DRM authentication key to the DRM server; A sales control unit controlling sales registration of the digital content from the seller terminal, and And a purchase control unit for controlling the purchase of the digital content from the purchaser terminal. The method of claim 4, wherein Wherein the sales control unit includes a first sales control unit controlling sales registration of the first digital content to which DRM is not applied, and a second sales control unit controlling sales registration of the second digital content to which DRM is applied, and Used content trading system. The method of claim 5, And the DRM server grants a new DRM authentication key to the first digital content and updates the DRM authentication key to the second digital content. The method of claim 5, The second sales control unit deletes the second digital content and / or deletes the DRM authentication key for the second digital content when the second digital content is registered for sale from the seller terminal. Trading relay and used content trading system. The method of claim 4, wherein When the purchase price of the digital content is paid from the purchaser terminal, the purchase controller pays the selling price of the digital content to the seller terminal and pays the relay fee of the digital content to the relay server. Trading relay and used content trading system. The method of claim 1, And a digital content transaction relay and used content transaction system capable of moving the digital content to which the DRM is applied from the first storage medium to the second storage medium in the buyer terminal. The method of claim 9, And a DRM authentication unit for the purchaser terminal to update the DRM authentication key of the digital content, and a DRM movement control unit for controlling the movement of the digital content stored in the first storage medium to the second storage medium. Trading relay and used content trading system. The method of claim 10, The second storage medium after the DRM movement control unit obtains the digital content and the DRM authentication key corresponding to the digital content from the first storage medium, requests the DRM authentication unit to update the DRM authentication key, and then updates the DRM authentication key. And the digital content and the DRM authentication key are deleted from the first storage medium. The method of claim 9, And the first storage medium and / or the second storage medium are any one of a hard disk, a CD, a DVD, a removable disk, and a portable player. The method of claim 1, The purchaser terminal and / or the seller terminal, at least one of a laptop, a personal computer, an Internet TV, an offline store POS system, a navigation system, a portable game machine, a wireless LAN terminal, a mobile phone, and a video game machine; Used content trading system. The method of claim 1, And at least one of the buyer terminal, the seller terminal, the content service server, and the access relay server are connected through a communication network. The method of claim 14, And wherein the communication network is at least one of an internet communication network, a WiBro communication network, a cable TV, a DMB network, and an internet TV network. The method of claim 1, The digital content, avatar, audio files, video files, pictures, images, photos, documents, user-generated digital content, mobile coloring, mobile lettering, mobile ringtones, landline coloring, landline phone lettering, e-book digital content, education Or at least one of digital content for learning, knowledge content, coupons, games, fortune telling, lottery tickets, cartoons, news, and shopping information. The method according to any one of claims 1 to 16, A digital content transaction relay, wherein the access relay server and / or the content service server is a web site domain implemented on the Internet, and at least one of the login controller, the DRM controller, the sales controller, and the purchase controller is implemented by an active access agent program; Used content trading system. The method according to any one of claims 1 to 16, The digital content transaction relay and used content transaction system, wherein the digital content is used digital content used by a user to purchase digital content to which DRM is applied. (a) authenticating a user login from the seller terminal and / or the buyer terminal to the relay server; (b) authenticating a login to a content service server through the relay server; (c) registering digital content to be sold from the seller terminal in the content service server; and (d) purchasing the digital content from the content service server through DRM authentication. The method of claim 19, Digital content transaction relay and used content transaction method for providing a relay server login authentication key for authenticating the login to the relay server in the step (a). The method of claim 19, In step (b), Logging into the relay server from the seller terminal and / or the buyer terminal, Selecting a content service server to be accessed from at least one of the content service servers; and And a content service server login authentication key for authenticating the login to the content service server. The method of claim 19, In step (c), Receiving a request for sales registration of the digital content to be sold together with a DRM authentication key for the DRM authentication from the seller terminal; Verifying the DRM authentication key; Checking the presence or absence of the digital content to be sold to the content service server; and And deleting and / or disabling the digital content to be sold. The method of claim 22, And uploading the digital content to be sold to the content service server. The method of claim 19, The step (c) of the digital content transaction relay and second-hand content transaction method comprising the step of uploading the digital content from the seller terminal to the content service server, the DRM is not applied. The method of claim 19, In step (d), Selecting digital content to be purchased from among digital contents in the content service server, Receiving a payment for the digital content to be purchased; Updating a DRM authentication key of the digital content to be purchased, and And providing the digital content to be purchased and the DRM authentication key. The method of claim 25, The step (d) further comprises the step of providing preview information of the digital content selected from among the digital content in the content service server. The method of claim 19, Selecting digital content to be moved on the first storage medium; Importing the digital content to be moved from the first storage medium together with a DRM authentication key; Selecting a second storage medium, Updating the DRM authentication key; And storing the digital content on the second storage medium together with the DRM authentication key.

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