KR100589994B1 - System for addressing to contents on p2p network and method thereof - Google Patents

Abstract

The present invention relates to a method and system for assigning a URL to each content in each terminal file system on a P2P network. The content addressing method is a digital content resource locator (DCRL) which is a URL indicating each content of a P2P user terminal. Requesting, the gateway server receives the DCRL requested by the user, interprets a user ID and a terminal identifier, extracts terminal identifier information where the content is located, checks the state of the service terminal where the content is located, and then the service terminal. Providing a path to access to, and the P2P user terminal accesses or receives the content located in the P2P service terminal through the access path.

P2P, Content, Addressing, DCRL, HTTP Relay, Content Caching

Description

System for addressing to contents on P2P network and method

1 is a network configuration diagram in which a content addressing system on a P2P network according to the present invention operates.

2 is a detailed configuration diagram of a content addressing system on a P2P network according to the present invention.

3 is a DCRL processing flow of a first embodiment according to a content addressing system on a P2P network according to the present invention.

4 is a DCRL processing flow of a second embodiment according to a content addressing system on a P2P network according to the present invention.

5 is a DCRL processing flow of a third embodiment according to a content addressing system on a P2P network according to the present invention.

6 is a DCRL processing flow of a fourth embodiment according to a content addressing system on a P2P network according to the present invention.

`` Explanation of symbols for main parts of drawings ''

100: user terminal 200: service terminal

210: HTTP processing unit 220: DCRL processing unit

230: service terminal state maintenance unit 240: content DB (file system)

300: gateway server 310: HTTP processing unit

330: HTTP relay unit 340: Service terminal state management unit

350: user authentication unit 360: content caching unit

400: user directory server 410: database

420: membership registration / management interface 500: firewall / NAT

The present invention relates to a content addressing system on a P2P network and a method thereof, and more particularly to addressing a content of a P2P terminal by addressing an address system that can specify a URL for each of contents on various terminal file systems scattered on the P2P network. A content addressing system and method thereof on a P2P network can be recycled anywhere.

The development of communication technology and hardware that has been developed day by day has maximized the possibility of using personal PCs, and much attention and effort has been paid to the use of terminal resources in the internet area by using P2P technology. Similarly, efforts by several portals to balance server load by integrating P2P are accelerating.

The P2P service operates by installing a P2P application on a user terminal to share content such as a file among users who have the same application.

However, the file sharing service through the above-described P2P application has a characteristic of a closed network in which other users who do not install the corresponding application cannot view the shared content.

In addition, as in the case of the MP3 file as the content, the process for obtaining content that is present on the Internet and continuously generated is obtained by accessing the MP3 sharing site to log in and obtaining the information, and as a criterion for obtaining the content as a P2P service. There is a problem in that it is inevitable to rely on the popularity of a site or a P2P application, and information of various fields is not easily obtained because desired information is distributed by closed communities.

In addition, when the resources of the PC terminals are to be recycled in the P2P service systems, there is a need for a method of distinguishing each content scattered among various terminals and obtaining the contents. In this method, the terminal can be connected to the Internet in an online state. In this situation, there is an urgent need for the emergence of new technologies that allow content to be recycled using the same means at any time.

The present invention has been made to solve the problems of the prior art as described above, the address system that can designate one by one resources ranging from the content of the various terminals distributed on the P2P network and the content of the terminal to use them To provide a consistent addressing method and system for the same.

In addition, an object of the present invention is a server technology that can analyze the address system and deliver a request for content to the terminal, a terminal application that can respond to the HTTP-based URL content request, the location of the terminal application or Internet access It is an object of the present invention to provide a content addressing method and a system for providing a service regardless of a form and a firewall.

In addition, the present invention provides a consistent address system that can distinguish and specify each of the PC terminal and the content by assigning a distinct identifier to all PC terminals and content so that the designated address is not changed unless the content is deleted or moved. It is to.

In order to achieve the above object, a content addressing system on a P2P network according to the present invention receives a digital content resource locator (DCRL) that designates the content, including a web browser, in order to access a desired P2P content. A P2P user terminal requesting access to the terminal in which the content is stored and the DCRL inputted through the web browser from the P2P user terminal are extracted to extract terminal identifier information on which the content is located, and the state of the terminal in which the content is located. After confirming, the gateway server for forming or providing an accessible path, and the content requested for access from the P2P user terminal is stored, is connected to the gateway server, and continuously transmits network status information to the gateway server, The gateway And a service terminal that accesses the P2P user terminal or transmits the predetermined content to the P2P user terminal when the access request is received from the server.

In addition, in the content addressing system on a P2P network according to the present invention, the DCRL is configured to include a gateway server address, a user ID, a terminal identifier, an HTTP CGI program for processing the DCRL, the content path of the service terminal will be.

In addition, in the content addressing system on a P2P network according to the present invention, the gateway server is characterized in that it is interlocked with the user directory server that provides a user interface for P2P users and stores user ID and password information.

In addition, in the content addressing system on a P2P network according to the present invention, the gateway server, an HTTP processing unit for receiving a DCRL request transmitted from the P2P user terminal and transmits a response, and receives the received DCRL request to a service terminal A DCRL processing unit that forms or provides an access path to deliver the access path or the requested content to the HTTP processing unit, checks the status of the service terminal, maintains and manages the connection information, and connects the DCRL processing unit to the DCRL request It is characterized in that it comprises a service terminal state management unit for providing information, and a user authentication performing unit for performing authentication for the user of the P2P user terminal or P2P service terminal.

In addition, in the content addressing system on the P2P network according to the present invention, the gateway server, if the service terminal is unable to deliver the DCRL request by the firewall or NAT, and provides a connection path with the service terminal and the DCRL processing unit; It characterized in that it further comprises an HTTP relay unit for relaying the transmission and response of the DCRL request between the service terminal.

In addition, in the content addressing system on a P2P network according to the present invention, the gateway server further comprises a content caching unit for storing the content corresponding to the requested DCRL for reuse.

In addition, in the content addressing system on a P2P network according to the present invention, the P2P service terminal, the HTTP processing unit for receiving the DCRL request from the gateway server and transfers the access path or content to the gateway server or the user terminal, the The DCRL processing unit processes the DCRL requested from the HTTP processing unit, reads the path in which the content is stored, and delivers the information to the HTTP, performs user authentication of the service terminal, and continuously transmits network state information of the service terminal to the gateway server. The service terminal state maintaining unit, and the content DB for storing the content designated the DCRL path in the service terminal.

On the other hand, in the content addressing method on a P2P network according to the present invention, requesting a digital content resource locator (DCRL) designating a predetermined content in the P2P user terminal, receiving a DCRL requested by the user at the gateway server, the user ID, Extracting terminal identifier information on which the content is located by analyzing a terminal identifier, checking a state of a service terminal in which the content is located, and providing a path to access the service terminal; and the P2P user terminal may access the service terminal. And accessing or receiving the content located in the P2P service terminal through a path.

In addition, in the content addressing method on a P2P network according to the present invention, the step of providing a path for the gateway server to access the service terminal, the user terminal in the DCRL using the IP address and the service port of the service terminal; It is characterized in that the URL to be directly connected to the service terminal to be transmitted to the user terminal.

Further, in the content addressing method on a P2P network according to the present invention, the step of providing a path for the gateway server to access the service terminal, the gateway server to process the connection for the DCRL request to the service terminal. Generating a relay connection by requesting a relay connection to be generated; transmitting the DCRL request through the relay connection by the gateway server; and after the service terminal reads the content corresponding to the requested DCRL, the relay Transmitting to the gateway server through a connection, wherein the gateway server comprises transmitting the content corresponding to the requested DCRL to the P2P user terminal.

In addition, in the content addressing method on a P2P network according to the present invention, the gateway server further comprises the step of storing the content corresponding to the DCRL transmitted from the service terminal to a content caching unit.

In addition, in the content addressing method on a P2P network according to the present invention, the DCRL includes a gateway server address, a user ID, a terminal identifier, an HTTP CGI program for processing the DCRL, and a content path of a service terminal. It is.

In addition, in the content addressing method on a P2P network according to the present invention, the step of requesting a digital content resource locator (DCRL) for designating predetermined content in the P2P user terminal, input the DCRL in the address bar of the web browser, or file This is done by opening a stored DCRL or by clicking a DCRL hanging over an HTTP link.

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

1 is a network configuration diagram in which a content addressing system on a P2P network according to the present invention operates.

In FIG. 1, a content addressing system on a P2P network according to the present invention provides a service for allowing a P2P user terminal 100 to access or download and use digital content through a P2P network on the Internet, and for allowing the content to be accessed or provided. The gateway server 300 as a relay system for processing a digital content resource locator (DCRL) request, which is a connection address specifying content between the terminal 200 and the P2P user terminal 100 and the service terminal 200. It includes.

The P2P user terminal 100 includes a web browser or any kind of user application that can request a URL, and if a user inputs a digital content resource locator (DCRL) that designates the content to access desired digital content, An access request is made to a service terminal in which the content is stored.

In addition, the gateway server 300 receives the DCRL request input from the P2P user terminal 100 through a web browser, extracts terminal identifier information on which the content is located, and checks the state of the terminal where the content is located. After confirming, a connection path is formed or provided.

Meanwhile, the service terminal 300 stores contents requested for access from the P2P user terminal, is connected to the gateway server, continuously transmits network state information to the gateway server, and receives a connection request from the gateway server. In this case, access is performed to allow the P2P user terminal 100 to access a predetermined content or transmit the content to the P2P user terminal 100.

In FIG. 1, reference numeral 500 denotes a firewall or NAT (Network Address Translation) installed in the service terminal 200.

The terminals in the P2P network all have a storage device, and various contents such as a video file, as well as a document and a music file are stored.

In order to designate digital contents distributed in the respective terminals, a DCRL (Digital Contents Resource Locator) is defined as a format of an address system having a URL format.

The DCRL generates an identifier for each PC terminal, and the identifier of the content uses a file system path in the terminal where the content is located.

The identifier for the PC terminal can be guaranteed uniqueness by using a unique and unchanged user ID (UUID) based on a user ID and a unique value that is not changed, such as a hard disk serial of the terminal. Even if the connection method is changed or the program is reinstalled, the generated address is never changed.

A user according to the present invention is a case where a user ID is issued by registering with a DCRL addressing service according to the present invention to use a content access or content transmission designated according to the DCRL method according to the present invention, and is most easily understood for convenience. In one embodiment, the owner of the service terminal 200 is a member to join the digital content contained in his terminal from the terminal 100 in another place to access or download the digital content through a web browser in one embodiment Although described as an example, this invention is not limited to this, It is widely applicable.

An example of the DCRL defined as above may be configured as follows.

http://gateway.dcrl.net/user-ID/03ade8.../dcrl_handler?rest-path

 Here, gateway.dcrl.net is a gateway server address, user-ID is a user ID, 03ade8 ... is a terminal identifier, the UUID as a terminal identifier, and dcrl_handler is an HTTP CGI (common gateway) to process DCRL requested from the terminal. interface), the last rest-path represents the content path of the file system of the service terminal 200, respectively.

The terminal identifier is a value for generating a UUID based on a hard disk serial value and a user ID.

Since the hard disk serial value is never changed, and the user ID is also the same value as the P2P site or P2P service member, it will have the same address while using the same hard disk, that is, while content is in the hard disk. .

In addition, uniqueness of the terminal identifier, which is a UUID generated based on a unique user ID in the service domain, may be guaranteed.

In addition, the reason why the hard disk serial is used to generate the terminal identifier is to distinguish between multiple terminals used by the same user.

The DCRL request is transmitted by the gateway server 300 to the corresponding service terminal 200 using the terminal identifier (HTTP Redirection). The HTTP CGI program becomes a part of initially receiving the DCRL request on the terminal.

Although it is described as HTTP CGI program here, it can be implemented in alternative languages such as PHP, JSP, Perl, etc. according to the implementation method.

The CGI program may include security devices for various access control considering that the DCRL can be used by anyone as a URL.

In addition, the rest-path has a path value on the file system of the terminal including the file name, which is used by the HTTP CGI program to locate the content in the file system.

The above structure can be used to define the URL format, and the DCRL defined in this way has a consistent address system that can specify content at any location of all terminals.

2 is a detailed configuration diagram of a content addressing system on a P2P network according to the present invention.

As shown in FIG. 2, according to an embodiment of the present invention, the gateway server 300 includes an HTTP processor 310, a DCRL processor 320, a service terminal state manager 340, and a user authentication performer 350. It may be configured to include.

The HTTP processing unit 310 receives a DCRL request or transmits a response transmitted from the P2P user terminal 100, and the DCRL processing unit 320 receives the received DCRL request to access a service terminal 200. Form or provide a to deliver the access path or the requested content to the HTTP processing unit 310.

In addition, the service terminal state manager 340 maintains and manages connection information such as IP and port information required when checking the connection state of the service terminal 200 and transmitting a DCRL request to the service terminal 200. The DCRL processing unit 320 provides access information corresponding to the DCRL request, and the user authentication performing unit 350 receives the user ID as a P2P member using a content service according to the DCRL request. ) Or to authenticate the user of the P2P service terminal 200.

On the other hand, the gateway server 300 provides a connection path with the service terminal 200 when the service terminal 200 is located inside a firewall or NAT and cannot transmit the DCRL request to the service terminal 200. And the HTTP relay unit 330 for relaying the transmission and response of the DCRL request between the DCRL processing unit 320 and the service terminal 200.

The HTTP relay unit 330 relays an HTTP request / response in the middle through a connection with a service terminal 200 prepared in advance when the service terminal 200 cannot directly access the terminal by a firewall / NAT. It plays a role similar to Proxy.

In addition, the gateway server 300 may further include a content caching unit 360 for storing the content corresponding to the requested DCRL for reuse.

The content caching unit 360 may include a disk space or a database for storing the content on the service terminal 200 in the gateway server 300 in order to increase the response speed when the request for the content that has already been requested is repeated. have.

Referring to FIG. 2, the gateway server 300 provides information such as a user registration and management interface 420 and a user ID and password for providing a user interface for P2P membership, member information input, and change for a P2P user. It is configured to interoperate with the user directory server 400 including a database 410 for storing.

In FIG. 2, the service terminal processes the DCRL request by a service terminal application.

The terminal application is an application program located on the service terminal 200 and is installed in a terminal to which DCRL is to be given for contents.

The service terminal application is driven through the user directory server 400 by being a member of a P2P site or a site serving content providing, downloading and installing the terminal application, and then running in the service terminal 200.

When the service terminal application is driven, it is connected to the gateway server 300 to transmit user authentication information such as a user ID, password, and terminal identifier to perform user authentication, and receive the result to access the service information of the service terminal 200. To the gateway server 300.

Then, when the connection information such as the IP address and port of the service terminal 200 is transmitted to the gateway server 300, the gateway server 300 is a network such as the presence of a firewall / NAT on the service terminal 200 The state is checked and the result is transmitted to the service terminal 200, and the state is maintained so that the service terminal 200 can access the gateway server 300.

Referring to FIG. 2, the terminal application is configured to include an HTTP processing unit 210, a DCRL processing unit 220, a service terminal state maintaining unit 230, and a file system as a content DB in which content is located.

The HTTP processor 210 receives the DCRL request from the gateway server 300 and transmits an access path or corresponding content to the gateway server 300 or the user terminal 100.

The DCRL processing unit 220 reads the path in which the content corresponding to the DCRL requested from the HTTP processing unit 210 is stored and delivers the path to the HTTP.

The service terminal state maintaining unit 230 performs user authentication of the service terminal 200 and continuously transmits network state information of the service terminal to the gateway server, and the content DB 240 is located in the service terminal. In the DCRL path consists of a file system that stores the specified content.

The service terminal state maintaining unit 230 establishes a connection with the gateway server 300 at the beginning, performs user authentication, transmits access information to the gateway server 300, and continuously connects online every predetermined time. By transmitting a notification message, and when the network state or situation changes, such as network termination, IP change, etc. by sending a message notifying the gateway server 300 to maintain the connection state according to the DCRL request at all times.

The service terminal application maintains a control connection with the gateway server 300 to transmit an Alive message indicating that the service terminal application is alive, and data connection for HTTP request / response relay when inside a firewall or NAT. Wait for the reception of the relay connection creation request message from the service terminal state management unit 340 of the gateway server 300.

Now, the content addressing method on the P2P network according to the present invention described above will be described in detail.

3 is a DCRL processing flow of a first embodiment according to a content addressing system on a P2P network according to the present invention.

Referring to FIG. 3, the process of the service terminal 200 of the content addressing system on the P2P network according to the present invention is online and located outside the firewall or NAT.

First, the following in the web browser address bar of the user terminal 100

http://gateway.dcrl.net/A/1/dcrl_handler?d:＼music＼a.mp3

 Enter DCRL to request DCRL (Step ①).

In this case, the user ID is "A", the terminal identifier is "1", the content location is d: \ music \ a.mp3 in the service terminal 200, the IP for accessing the service terminal 200, and the port information is 211.219. Assume .166.180: 8080.

Here, instead of inputting the DCRL into the web browser address bar in the user terminal 100, the DCRL stored as a file (.lnk) is opened in the user terminal 100, or the DCRL hanging through an HTTP link to a portal site or a blog bulletin board. You can request a DCRL using a click method.

Next, the HTTP processing unit 310 of the gateway server 300 receives the DCRL request sent by the user and delivers it to the DCRL processing unit 320 (step ②).

The DCRL processor 320 receiving the requested DCRL confirms that the service terminal 200 is online and outside the firewall / NAT through the service terminal state manager 340 (step ③).

The DCRL processing unit 320 converts the DCRL into a URL that can directly access the service terminal 200 using the IP address and the service port of the service terminal 200 and transmits the URL to the user terminal 100 (step ④). ).

http://211.219.166.180:8080/dcrl_handler?d:＼music＼a.mp3

Next, the user terminal 100 receives a URL that can directly access the service terminal 200 and uses it to reconnect to the service terminal 200 (step ⑤).

Next, the HTTP processing unit 210 of the service terminal 200 transmits the URL to the DCRL processing unit 220 of the service terminal (step ⑥).

In addition, the DCRL processing unit 220 reads the file of the file system path (d: \ music \ a.mp3) location of the requested DCRL and delivers the file to the HTTP processing unit (steps ⑦ and ⑧).

Finally, the HTTP processing unit 210 transmits the requested content in the HTTP response to the user terminal 100 (step ⑨).

4 is a DCRL processing flow of a second embodiment according to a content addressing system on a P2P network according to the present invention.

Referring to Figure 4, it shows the process when the service terminal 200 of the content addressing system on the P2P network according to the present invention is online and located inside the firewall or NAT.

First, the following in the web browser address bar of the user terminal 100

http://gateway.dcrl.net/A/1/dcrl_handler?d:＼music＼a.mp3

 Enter DCRL to request DCRL (Step ①).

In this case, it is assumed that the user ID, the terminal identifier, the content location IP, and the port information are the same as in the first embodiment, and the DCRL request method is the same as the first embodiment.

Next, the HTTP processing unit 310 of the gateway server 300 receives the DCRL request sent by the user and delivers it to the DCRL processing unit 320 (step ②).

The DCRL processing unit 320 receiving the requested DCRL confirms that the service terminal 200 is online and inside the firewall / NAT through the service terminal state management unit 340 (step ③).

At this time, the service terminal 200 is blocked by a firewall or has a private IP by NAT and thus cannot be directly connected for DCRL delivery.

Here, the DCRL processing unit 320 requests a new relay connection generation to the service terminal state maintaining unit 230 through the service terminal state management unit 340 (step ④).

The service terminal state maintaining unit 230 generates the requested relay connection and passes the generated relay connection to the HTTP processing unit 220 as if a new HTTP request arrived at the HTTP processing unit (step ⑤).

The HTTP processing unit 210 received the relay connection from the service terminal state maintaining unit 230 waits for the HTTP request (step ⑥).

The DCRL processing unit 320 instructs the HTTP relay unit 330 to transmit a DCRL request to the service terminal 200 through a relay connection (step ⑦).

The HTTP processor 210 of the service terminal 200 transmits the DCRL to the DCRL processor 220 of the service terminal 200 (step ⑧).

The DCRL processing unit 220 reads the file of the file system path (d: 'music'a.mp3) location of the requested DCRL (step ⑨).

The DCRL processing unit 220 transfers the read content to the HTTP processing unit 210 (step S).

The HTTP processing unit 210 loads the content in the HTTP response and transmits the content to the HTTP relay unit 330 of the gateway server 300 through the relay connection (step ⑪).

The relay unit 330 of the gateway server 300 receiving the content caches the content to the content caching unit 360 for reuse (step ⑫).

The HTTP relay unit 330 of the gateway server 300 transmits the content to the HTTP processing unit 310 (step ⑬).

The HTTP processing unit 310 loads the content in the HTTP response and transmits the content to the user terminal 100 (step ⑭).

5 is a DCRL processing flow of a third embodiment according to a content addressing system on a P2P network according to the present invention.

Referring to FIG. 5, the service terminal 200 of the content addressing system on a P2P network according to the present invention is in an online state and is located in a firewall or NAT, and shows a process of using the cached content in the content caching unit 360. .

As in the case of the third embodiment, steps ①, ② and ③ are performed in the same manner.

Next, it is confirmed that there is content stored in the content caching unit 360 and reads it (step ④).

The DCRL processor 320 transmits the read content to the HTTP processor 310 (step ⑤).

The HTTP processing unit 30 loads the content in the HTTP response to the user terminal 100 (step ⑥).

6 is a DCRL processing flow of a fourth embodiment according to a content addressing system on a P2P network according to the present invention.

Referring to FIG. 6, the service terminal 200 of the content addressing system on the P2P network according to the present invention shows a processing process when it is not online.

First, the following in the web browser address bar of the user terminal 100

http://gateway.dcrl.net/A/1/dcrl_handler?d:＼music＼a.mp3

 Enter DCRL to request DCRL (Step ①).

In this case, it is assumed that the user ID, the terminal identifier, the content location IP, and the port information are the same as in the first embodiment, and the DCRL request method is the same as the first embodiment.

Next, the HTTP processing unit 310 of the gateway server 300 receives the DCRL request sent by the user and delivers it to the DCRL processing unit 320 (step ②).

DCRL processing unit 320 receives the requested DCRL, the service terminal 200 is online through the service terminal state management unit 340 regardless of whether the firewall or NAT 250 is installed in the service terminal 200. (Step ③).

The page "page not found" is delivered to the HTTP processor 310 (step ④).

The HTTP processor 310 transmits the "page not found" page in the HTTP response to the user terminal 100 (step ⑤).

As described above, by using the DCRL defined according to the content addressing system and method on the P2P network according to the present invention, it is possible to give a URL that can publish content located in the personal terminal device to the outside, and directly to the personal terminal from the outside. The location of content of all individuals can be expressed in a consistent format so that the contents of the device can be accessed.

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

According to the present invention, since the addressing system does not need a separate user application to use it, users can copy their contents to an auxiliary storage device such as a USB device, without having to carry around and carry it wherever they are connected to the Internet. It can be used even in

In addition, Internet service providers have the advantage of significantly reducing the cost by using the user terminal side of the necessary resources such as server equipment, network lines to secure the content or provide the content.

Claims (13)

A P2P user terminal that receives a digital content resource locator (DCRL) that designates the content, including a web browser, and requests access to a terminal in which the content is stored to access P2P content desired by a user; A gateway server that receives the DCRL input from the P2P user terminal through a web browser, extracts terminal identifier information on which the content is located, checks the state of the terminal where the content is located, and forms or provides a path to be accessed. ; And The content requested for access from the P2P user terminal is stored, is connected to the gateway server, continuously transmits network state information to the gateway server, and performs a connection when there is a connection request from the gateway server. And a service terminal for allowing a user terminal to access a predetermined content or transmitting the predetermined content to the P2P user terminal. The method of claim 1, Wherein the DCRL comprises a gateway server address, a user ID, a terminal identifier, an HTTP CGI program for processing the DCRL, and a content path of a service terminal. The method of claim 1, The gateway server is a content addressing system on a P2P network, characterized in that it provides a user interface for a P2P user and interoperates with a user directory server that stores user ID and password information. The method of claim 1, The gateway server, An HTTP processor for receiving a DCRL request transmitted from the P2P user terminal or transmitting a response; A DCRL processing unit receiving the received DCRL request to form or provide an access path to a service terminal to deliver an access path or requested content to the HTTP processing unit; A service terminal state management unit for checking a state of the service terminal, maintaining and managing access information, and providing access information corresponding to the DCRL request to the DCRL processing unit; And And a user authentication performing unit for authenticating a user of a P2P user terminal or a P2P service terminal. The method of claim 4, wherein When the service terminal fails to deliver the DCRL request by the firewall or NAT, the gateway server establishes a connection path with the service terminal and relays the transmission and response of the DCRL request between the DCRL processing unit and the service terminal. The content addressing system on a P2P network, further comprising a relay unit. The method of claim 4, wherein The gateway server And a content caching unit for storing the content corresponding to the requested DCRL for reuse. The method of claim 1, The P2P service terminal, An HTTP processor configured to receive the DCRL request from a gateway server and transmit an access path or content to the gateway server or the user terminal; A DCRL processing unit which processes a DCRL requested from the HTTP processing unit, reads a path in which the content is stored, and delivers the path to the HTTP; A service terminal state maintaining unit which performs user authentication of the service terminal and continuously transmits network state information of the service terminal to the gateway server; And And a content DB for storing the content in which the DCRL path is designated in the service terminal. Requesting a digital content resource locator (DCRL) designating predetermined content at a P2P user terminal; The gateway server receives the DCRL requested by the user, interprets the user ID and the terminal identifier, extracts terminal identifier information on which the content is located, checks the state of the service terminal in which the content is located, and then accesses the service terminal. Providing a; And And the P2P user terminal accessing or receiving the content located in the P2P service terminal through the accessible path. The method of claim 8, Providing a path for the gateway server to access the service terminal, And converting the DCRL into a URL for directly accessing the service terminal using the IP address and the service port of the service terminal and transmitting the DCRL to the user terminal. The method of claim 8, Providing a path for the gateway server to access the service terminal, Generating, by the gateway server, a relay connection by requesting the service terminal to generate a relay connection to process a connection for the DCRL request; The gateway server sending the DCRL request over the relay connection; Reading, by the service terminal, the content corresponding to the requested DCRL and transmitting the content to the gateway server through the relay connection; And the gateway server transmitting the content corresponding to the requested DCRL to the P2P user terminal. The method of claim 10, The gateway server further comprises the step of storing the content corresponding to the DCRL transmitted from the service terminal to a content caching unit, content addressing method on a P2P network. The method of claim 8, The DCRL is configured to include a gateway server address, a user ID, a terminal identifier, an HTTP CGI program for processing the DCRL, and a content path of a service terminal. The method of claim 8, The requesting of the digital content resource locator (DCRL) designating predetermined content in the P2P user terminal may include inputting a DCRL into a web browser address bar, opening a DCRL stored as a file, or clicking a DCRL hanging over an HTTP link. And a content addressing method on a P2P network.

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