KR100611418B1 - System and method for protecting wireless contents - Google Patents

Abstract

The wireless content protection system according to the present invention generates a unique key corresponding to the content requested by the mobile terminal, secures the content with the unique key to generate a security file, and provides a security file and the unique key to the mobile terminal; It stores the security file and the unique key received from the server, retrieves the security file corresponding to the content requested by the user according to the user's secured content request offline, and checks whether the unique key exists to decrypt the security file. Accordingly, the mobile terminal decrypts the security file or sends an error message.

As described above, the present invention transmits the generated security file and the unique key to the mobile terminal after the secure processing with the unique key when transmitting the content data to the mobile terminal, and by opening the secure file based on the unique key offline Even though the contents are indiscriminately copied and distributed, they cannot be viewed unless the unique key is stored, thereby effectively protecting the copyright of the wireless contents.

Description

Wireless Content Protection System and Method {SYSTEM AND METHOD FOR PROTECTING WIRELESS CONTENTS}

1 is a block diagram illustrating a wireless content protection system according to the present invention;

2 is a view showing the structure of a security file used in the wireless content protection system of the present invention,

3 is a flowchart illustrating a process of providing a security process by a wireless content protection system according to the present invention;

Figure 4 is a flow chart illustrating a content protection process offline in accordance with the present invention.

<Description of the code | symbol about the principal part of drawing>

100: mobile terminal 110: a user access authority module

120: key storage unit 130: security file storage unit

150: wireless communication network 200: content server

210: access authority module 220: access authority DB

230: content DB 240: key generation unit

The present invention relates to a content protection technology, and more particularly, to a wireless content protection system and method for preventing the distribution and unauthorized use of content provided to a mobile terminal.

Currently, the wireless network is growing faster than any other media (radio, TV, cable broadcasting, etc.) due to the increase in the number of users using the wireless communication, and the future development is highly appreciated. The medium of such a wireless communication network has the potential to generate a huge demand market, and thus many developers are developing various wireless contents.

In particular, with the development of advanced technologies such as real-time video transmission technology, location tracking, and voice recognition, various high quality multimedia services can be provided through a wireless communication network. Examples of the mobile terminal capable of providing multimedia services through the wireless communication network include a terminal for IMT-2000 or a PDA, which is a third generation mobile terminal capable of implementing multimedia services.

Most of the high quality multimedia contents data downloaded by the mobile terminal through the wireless communication network are copyrighted, but such copyrighted contents are downloaded by one person and can be copied indefinitely regardless of copyright. There is this.

An object of the present invention is to solve the problems of the prior art, to provide a wireless content protection system and method for preventing the distribution and unauthorized use of content provided to the mobile terminal offline.

In order to achieve the above object, the present invention provides a system for protecting content provided to a mobile terminal connected to a server and a wireless communication network, generating a unique key corresponding to the content requested by the mobile terminal, the content by the unique key Securely generates a security file, stores the server providing the generated security file and the unique key to the mobile terminal, the security file and the unique key received from the server, and securely processes the user offline. The mobile terminal searches for a security file corresponding to a content requested by a user according to a content request, and decrypts the security file or sends an error message according to whether a unique key for decrypting the searched security file exists.

In addition, the present invention provides a method for protecting content provided to a mobile terminal connected to a server and a wireless communication network in which the access authority program is stored, receiving the unique number of the mobile terminal from the wireless communication network, the unique number number is sent to the server Determining whether it is a registered unique number, and if it is not a unique number registered in the server, registering the unique number and installing the access right program in the mobile terminal; Generating a unique key corresponding to the content requested by the terminal; generating a security file by securely processing the content requested by the mobile terminal with the generated unique key; and generating the generated security file and the unique key. Providing the mobile terminal with the security file and the unique key received from the server. Storing the secure file in a storage space, retrieving a secure file from the storage unit according to a request of a secure file including the secured content data on-line, and a unique key corresponding to the retrieved secure file. Determining whether or not to exist, and if the unique key is present, decrypting the security file with a unique key to extract content data, and display the content data on the display window, and as a result of the determination, the unique Sending an error message if the key does not exist.

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

1 is a block diagram showing a content protection system according to the present invention, Figure 2 is a structural diagram showing the structure of a security file used in the present invention.

Referring to FIG. 1, the content protection system is largely comprised of a content server 200 connected to a mobile terminal 100 and a wireless communication network 150, and the mobile terminal 100 may be provided with a wireless data service. For example, it connects to a wireless communication network 150 such as a PDA, a PCS, a cellular phone, or the like to request an arbitrary content server. In this case, the mobile terminal 100 includes a user access authority module 110, a key storage unit 120, and a security file storage unit 130.

The content server 200 receives the unique number of the mobile terminal 100 requesting the content through the wireless communication network 150 and secures the content requested by the mobile terminal 100 with the unique key. The unique key is provided to the mobile terminal 100 through the wireless communication network 150, and its configuration includes an access authority module 210, an access authority DB 220, a content DB 230, and a key generator 240. .

The access right DB 220 stores unique numbers of mobile terminals connected to the content server 200, and the content DB 230 stores a plurality of content data.

The key generation unit 240 generates a unique key for securely processing the content requested by the mobile terminal 100 and provides it to the access authority module 210. In this case, a unique key is generated for each content.

The access right module 210 searches the content data requested by the mobile terminal 100 in the content DB 230 and converts the retrieved content data into a secure file secured with a unique key provided from the key generator 240. Later, the security file and the unique key are provided to the mobile terminal 100 through the wireless communication network 150. In addition, the access authority module 210 stores an access restriction program for providing to the mobile terminal 100 connected for the first time, and installs it in the mobile terminal 100 connected for the first time. Through the installation of the access restriction program, the mobile terminal 100 is installed with a user access authority module.

The structure of the secure file secured with the unique key in the access authority module 210 includes, as shown in FIG. 3, a file identifier 300a for identifying a file, a unique key required for accessing the secured original file. An access control identifier 300b in which information is recorded, and a secured original file 300c.

The mobile terminal stores the unique key and the security file provided by the access authority module 210 in the key storage unit 120 and the security file storage unit 130, respectively.

Then, when there is a security file request from the user, the user access authority module 110 of the mobile terminal retrieves the file identifier 300a of the security files stored in the security file storage unit 130 and searches for the security file requested by the user. After searching, it is determined whether the unique key corresponding to the access control identifier 300b of the searched security file is stored in the key storage unit 120 to determine whether the user has access to the security file.

Here, when a unique key corresponding to the access control identifier 300b is stored in the key storage unit 120, the user access authority module 100 uses the unique key stored in the key storage unit 120 to perform security processing. After unsecuring the original file, it is displayed on the display.

An operation process of the content security system having the above configuration will be described with reference to FIGS. 3 to 4. 3 is a flowchart illustrating a process of securely processing content data according to the present invention, and FIG. 4 is a flowchart illustrating a process of reading a secure file secured by a mobile terminal while offline.

First, as shown in FIG. 4, the mobile terminal 100 requests content by accessing the content server 200 through the wireless communication network 150 (S300).

The access authority module 210 of the content server 200 receives a unique number of the mobile terminal 100, for example, a subscriber number, according to a connection of the mobile terminal 100, and then searches for and receives the access authority DB 220. It is determined whether the given unique number exists (S302, S304, S306). Through this method, it may be determined whether the user's mobile terminal 100 is the first terminal connected to the content server 200.

As a result of the determination in step S306, when there is no unique number in the access right DB 220, the access right module 210 installs the access right program in the mobile terminal 100 through the wireless communication network 150, and then step S310. Proceed to step (S308).

As a result of the determination in step S306, when a unique number exists in the access authority DB 220, the access authority module 210 searches for and retrieves the content requested by the mobile terminal 100 from the content DB 230 (S310). . In this case, the key generation unit 240 generates a unique key for securely processing the content and provides it to the access authority module 210 (S312).

The access authority module 210 generates a security file by securely processing the content retrieved from the content DB 230 with a unique key provided by the key generator 240, and then moves the security file and the unique key through the wireless communication network 150. Provided to the terminal 100 (S314, S316).

Through this process, the security file provided to the mobile terminal 100 is stored in the security file storage unit 130 of the mobile terminal and the unique key is stored in the key storage unit 120, and then read and displayed according to the user's request Is displayed. The process of reading and displaying such a security file will be described with reference to FIG. 4.

As shown in FIG. 4, according to a user's arbitrary content request, the user access right module 110 of the mobile terminal 100 examines the file identifiers 300a of the security files stored in the security file storage 130. The security file containing the content requested by the user is searched for (S400, S402).

The user access authority module 110 searches the key storage unit 120 to determine whether a unique key corresponding to the access control identifier 300b information of the retrieved security file is stored in the key storage unit 120 ( S404, S406).

As a result of the determination in step S406, when the unique key is not stored in the key storage unit 120, the user access right module 110 displays an error message such as "Cannot open the security file" on the display window (S408). .

As a result of the determination in step S406, when the unique key is stored in the key storage unit 120, the user access authority module 110 may access the unique key stored in the key storage unit 120, that is, the access control identifier 300b of the security file. Decrypt the security file with a unique key corresponding to the extracted original file (ie, content), and displays the content extracted from the security file on the display window (S410, S412).

As described above, the present invention transmits the generated security file and the unique key to the mobile terminal after the secure processing with the unique key when transmitting the content data to the mobile terminal, and by opening the secure file based on the unique key offline Even though the contents are indiscriminately copied and distributed, they cannot be viewed unless the unique key is stored, thereby effectively protecting the copyright of the wireless contents.

Claims (5)

A system for protecting content provided to a mobile terminal connected to a server and a wireless communication network, Generating a unique key corresponding to the content requested by the mobile terminal, generating a security file by securely processing the content with the unique key, and providing the generated security file and the unique key to the mobile terminal; A unique key for storing a security file and a unique key received from the server, searching for a security file corresponding to the content requested by the user according to the user's secured content request offline, and decrypting the retrieved security file. The mobile terminal decrypts the security file or sends an error message depending on whether Wireless content protection system comprising a. The method of claim 1, The server, A content DB storing content data to be provided to the mobile terminal; An access authority DB in which unique numbers of mobile terminals accessing the server are stored; A key generator for generating a unique key corresponding to the content requested by the mobile terminal; If the access right program is stored and receives the unique number and content request of the mobile terminal, and if the unique number of the mobile terminal is not in the access right DB, the access right program is installed in the mobile terminal, The wireless content protection system includes an access authority module that secures the content requested by the mobile terminal with the unique key generated by the key generation unit to generate a security file, and provides the security file and the unique key to the mobile terminal. . The method of claim 2, The unique number of the mobile terminal, And a subscriber number of the mobile terminal. The method of claim 1, The mobile terminal, A storage unit to store the security file and the unique key received from the server; A user who searches for a security file corresponding to the content requested by the user according to the user's secured content request and decrypts the security file or sends an error message according to whether a unique key corresponding to the searched security file exists. A wireless content protection system comprising an access rights module. Claims [1] A method for protecting content provided to a mobile terminal connected to a server and a wireless communication network storing an access authority program. Receiving a unique number of the mobile terminal from the wireless communication network, and determining whether the unique number is a unique number registered in a server; Registering the unique number and installing the access right program in the mobile terminal when the unique number is not registered in the server; Generating a unique key corresponding to the content requested by the mobile terminal; Generating a security file by securely processing the content requested by the mobile terminal with the generated unique key; Providing the generated security file and a unique key to the mobile terminal; Storing the security file and the unique key received from the server in a storage space; Retrieving a security file from the storage space according to a request of a security file including the secured content data offline; Determining whether a unique key corresponding to the retrieved security file exists in the storage space; As a result of the determination, if the unique key exists, decrypting the security file with the unique key, extracting content data, and playing the same; Transmitting an error message when the unique key does not exist as a result of the determination Wireless content protection method comprising a.

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