KR101213119B1 - Method and system for blocking improper contents - Google Patents

Abstract

PURPOSE: A negation content blocking method and system thereof are provided to effectively block negation content in a client terminal of a user by using a blocking policy of the user. CONSTITUTION: A CRC(cyclic redundancy checking) reception unit(110) receives blocking target CRC data from a blocking management server. A data base construction unit(120) stores the blocking target CRC data in a data base by converting the blocking target CRC data based on a key value. A monitoring unit(130) senses the file access of a process. A CRC extraction unit(140) extracts a CRC value in a part of a file which is accessed by the process. When the converted CRC value corresponds to the blocking target CRC value, a blocking unit(150) terminates the process. [Reference numerals] (110) CRC reception unit; (120) DB construction unit; (125) Blocking target DB; (130) Monitoring unit; (140) CRC extraction unit; (150) Blocking unit

Description

METHOD AND SYSTEM FOR BLOCKING IMPROPER CONTENTS}

The present invention relates to a method and system for blocking illegal content, and more particularly, to a method and system for blocking content for harmful or copyright infringement using a CRC value of a file.

With the development of high speed internet technology, it has become common to download and use contents such as movies, dramas, and games through the Internet. However, among contents such as movies and games circulated on the Internet, there are considerable contents of copyright infringement and also harmful contents such as pornography. Therefore, there is a high necessity of blocking access or blocking execution of such obscene contents or contents of copyright infringement.

Korean Patent No. 10-0991561 (hereinafter referred to as' 561 patent) extracts a cyclic redundancy check pattern of a file uploaded to or downloaded from the shared storage, and filters if it matches the cyclic redundancy check pattern stored in the database. A file filtering method in a file sharing service is disclosed.

Korean Patent Registration No. 10-0797600 (hereinafter referred to as' 600 patent) discloses a method of restricting use of a harmful video file to search for a video file of a user computer and encrypt and store the file in the case of a harmful video file.

Since the '561 patent can only block files transmitted and received over the network, there is a problem in that the file stored on the user's computer cannot be blocked, and the' 600 patent has to compress harmful files. It has a disadvantage of using a lot of resources of the computer, and can not easily block the execution of the file.

In addition, the '561 patent or the' 600 patent has a disadvantage in that it is not possible to block harmful substances differentially according to the user-specific blocking policy.

An object of the present invention is to provide an illegal content blocking method and system that can effectively block illegal content such as harmful content or copyright infringement content in a client terminal of a user, and can discriminate illegally content in accordance with a blocking policy of a user. It's there.

In addition, another problem to be solved by the present invention is to provide a method and system for blocking illegal content that can protect a database storing a list of illegal content from unauthorized duplication, and prevent a user from illegally using a blocking service. Is in.

In the negative content blocking method of the present invention for solving the above problems, in a method of blocking access to illegal content in an electronic terminal, receiving the blocking target CRC data from a blocking management server, the received blocking target CRC data Converting by using a user-dependent key value, storing the converted blocking target CRC data in a database, detecting a process accessing a file, CRC of a partial section of a file accessed by the process Extracting data and terminating the process if the extracted CRC data corresponds to the blocking target CRC data stored in the database.

In accordance with another aspect of the present invention, there is provided a device for blocking fraudulent content, comprising: a CRC receiver configured to receive blocking target CRC data from a blocking management server, and converting the received blocking target CRC data using a key value dependent on a user; A database constructing unit for storing the converted blocking target CRC data in a database, a monitoring unit detecting that a process accesses a file, a CRC extracting unit extracting a CRC value of a partial section of the file accessed by the process, and the converting unit And a blocking unit for terminating the process when the CRC value corresponding to the blocking target CRC value stored in the database.

According to the present invention according to the above configuration, according to the user's blocking policy, it is possible to effectively block illegal content such as sexually explicit content or copyright infringement content, and effectively block illegal content such as harmful content or copyright infringement content in the user's client terminal.

In addition, according to the present invention, it is possible to protect a database storing a list of illegal contents from unauthorized duplication, and to prevent a user from illegally using a blocking service.

1 is a functional block diagram schematically showing the configuration of a system for blocking illegal content according to an embodiment of the present invention.
2 is a functional block diagram schematically illustrating a configuration of a client terminal of a system for blocking illegal content according to an embodiment of the present invention.
3 is a flowchart illustrating a method of blocking illegal content according to an embodiment of the present invention.
4 and 5 illustrate a process of extracting CRC data from a file accessed by a process and comparing the CRC data with the blocking target CRC data.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, a device for blocking illegal content and a method for blocking illegal content according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram schematically illustrating a configuration of a system for blocking illegal content according to an embodiment of the present invention.

Referring to FIG. 1, an illegal content blocking system according to an embodiment of the present invention includes a client terminal 100, a blocking management server 200, and a CRC database 250.

The client terminal 100 is an information processing apparatus capable of data communication with the blocking management server 200 and executing contents such as music, video, and programs by a user's command. The client terminal 100 may be a personal computer (PC), a laptop computer, or a tablet computer. , Is implemented in devices such as smartphones. The client terminal 100 receives the blocking target CRC data from the blocking management server 200 and terminates the execution of the content when the content executed by the user's command corresponds to the blocking target content.

The blocking management server 200 generates CRC (Cyclic Reducdancy Checking) data of the blocking target content, stores and updates the CRC database 250, and stores the blocking CRC data stored in the CRC database 250 through the network. Function to provide to (100).

Blocked content is illegal content that is prohibited from being used according to a block management service policy or a user policy, and may be pornographic content, violent content, or illegal content of copyright violation.

Here, the content is a video file having an extension such as avi, mpeg, mkv, mov, wmv, a sound source file having an extension such as mp3, ogg, wma, wav, jpg, tif, gif, bmp, png, psd And an executable binary file, a compressed file, a virtual image file such as a CD or a DVD, and the like.

The blocking target content may be a lewd video file, a lewd photo file, a violent video file, a sound recording file of copyright violation, a storage medium image file of a copyright violation game, and the like. In addition, the blocking target content may be a compressed file that compresses obscene content, violent content, copyright violation content, and the like.

The blocking target content may be collected by the blocking management service provider or automatically collected by the blocking management server 200. The blocking management server 200 generates CRC data of the blocking target content from the collected blocking target content.

The CRC data is data obtained by converting content to be blocked using a cyclic redundancy check (CRC) algorithm. When comparing large data, comparing large data to small data in a reversible or irreversible way, respectively, is easier than comparing the large data as it is. The cyclic redundancy check (CRC) algorithm compares large data to small data. Is one of the ways to convert. The CRC algorithm is mainly used as a method for detecting whether there is an error in the transmitted data, and may be applied to confirm whether two different data are the same data. When the CRC data of a certain section of two different data are compared, the probability that the CRC data of the two different data are the same is extremely small. Accordingly, CRC data may be compared with respect to two different data to determine whether the two data are the same data or different data.

The CRC database 250 stores the CRC data of the blocking target content generated by the blocking management server 200 and provides the blocking target CRC data according to a request of the blocking management server 200.

2 is a functional block diagram illustrating a schematic configuration of a client terminal according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating a method for blocking illegal content according to an embodiment of the present invention.

2 and 3, the client terminal 100 of the negative content blocking system according to an embodiment of the present invention includes a CRC receiver 110, a database builder 120, a monitor 130, and a CRC extractor ( 140, the blocking unit 150, and the blocking target database 125.

The CRC receiver 110 receives the blocking target CRC data from the blocking management server 200 (S110). The CRC receiving unit 110 may receive all of the blocking target CRC data stored in the CRC database 250 of the blocking management server 200, or newly CRC database 250 after the latest update time of the blocking target database 125. ) May only receive the updated blocking target CRC data. For example, when the latest update date of the blocking target database 125 of the client terminal 100 is October 1, 2011, the CRC receiver 110 updates the CRC database 250 after October 1, 2011. Only the blocked target CRC data can be received.

In addition, the CRC receiver 110 may transmit a user identifier (for example, an ID of a user) to the blocking management server 200 and may receive only CRC data of content to be blocked according to a blocking policy for the user. For example, some users may need to block content that is not available to adolescents under 19 years of age, while others may need to block content that is not available to adolescents under 15 years of age. Alternatively, there may be a user who allows adult content but only needs to block illegal or copyrighted content. Accordingly, the CRC data of the blocking target content received by the CRC receiver 110 from the blocking management server 200 may vary according to a user. The CRC receiver 110 transmits a user identifier to the blocking management server 200. By only receiving CRC data of the content to be blocked according to the blocking policy for the user, it is possible to provide a blocking service differentially according to the user.

The database building unit 120 constructs a database by storing the blocking target CRC list received from the blocking management server 200 in the blocking target database 125 (S130).

At this time, the database building unit 120 converts the blocking target CRC data received from the blocking management server 200 using a key value dependent on the user (S120), and converts the converted CRC data to the blocking target database 125. Can be stored in (S130). The key value dependent on the user may be, for example, an ID of a user or a unique number assigned to each user.

Converting the blocking target CRC data using a key value dependent on the user may be, for example, encrypting and converting the blocking target CRC data using a key value dependent on the user. Since the blocking target CRC data is converted by using different key values for each user in the conversion process, even if the user receives the same CRC data from the blocking management server 200, The blocked target CRC data is stored in a different value. In addition, since the converted blocking target CRC data can be decrypted only through a key value dependent on the user, other users cannot view the blocking target CRC data.

As described above, when the blocking target CRC data is encrypted, unauthorized copying of the blocking target CRC data can be prevented, and a user can be prevented from illegally using the blocking target CRC data.

In general, in order to construct a block CRC data, a block service provider needs to collect block content from various contents on the Internet, and it is necessary to make an effort to extract CRC data from the block content. However, if the blocking CRC data is transmitted to the client terminal 100 of the user under the management / domination of the user without encryption, the collected data by the blocking service provider is forced to be exposed as it is. You can wear Therefore, by encrypting the CRC data to be blocked, the CRC data to be blocked can be prevented from being copied and used for other purposes.

In addition, the blocking policy may be different depending on the user. For example, user A may be subject to a policy that blocks only illegal content, such as copyright infringement, and user B may block not only copyrighted content but also content that is prohibited from use by adolescents (eg, adult content or games). Policy may apply. As such, since the content blocking policy may be different for each user, the blocking target CRC data stored in the blocking target database 125 may be different for each user. If the blocking target CRC data is made compatible regardless of the user, the user can obtain the blocking target CRC data of another user and disable the blocking policy applied to the user. Therefore, by converting the blocking target CRC data using a key value dependent on the user, it is possible to prevent the user from illegally using the blocking target CRC data.

The monitoring unit 130 monitors the process to access the file (S140). To this end, the monitoring unit 130 may be implemented as a background program resident running in the operating system of the client terminal 100.

Here, the process refers to a program executed in the operating system, and in particular, may be a program that is closely related to the execution of the content to be blocked. For example, the image may be a video program, a sound source program, an image viewer program, a virtual image program that recognizes a storage medium image such as a CD or a DVD.

The monitoring unit 130 may monitor and detect a process accessing the file, such as opening a video file in a video player, opening a sound file in a sound source player program, or opening a storage medium image in a virtual image program. .

In detail, the monitoring unit 130 may detect that a process accesses a file from a File Open event such as a call to an fopen function. If a File Open event occurs in a particular process, you can determine which file is accessed from the parameters of the File Open event (for example, the arguments to the fopen function).

If it is detected that the file is accessed by the process, the monitoring unit 130 may transmit the information of the file to the CRC extraction unit 140 to determine whether the accessed file corresponds to the content to be blocked. In addition, the monitoring unit 130 may transmit information on the process of accessing the file to the blocking unit 150. Herein, the information of the file may be a path and a file name of a file to be accessed, and the information of the process may be a path and a file name of a process executable file.

The CRC extractor 140 extracts CRC data from a file accessed by the process (S150). The CRC data may be extracted from data of some sections of the accessed file, and the sections from which the CRC data is extracted may be a plurality of sections.

Extracting the CRC data from the data of the entire file takes not only a long time but also takes up a lot of resources of the client terminal 100 and is inefficient. Therefore, it is preferable to extract CRC data from data of some sections of the file.

However, if CRC data is extracted from a small interval of data, there may be a possibility that two data having extremely low probability but not identical are determined to be the same. For example, it may be recognized that a normal content file that is not negative content is a content file to be blocked. Therefore, in order to minimize the possibility of such an error, the CRC extractor 140 may extract CRC data in at least three or more sections of the accessed file.

In addition, the CRC extractor 140 may change the location of extracting the CRC data according to the type of the file being accessed. For example, virtual image files and binary files cannot be executed with only a part of them, and one intact file is required to execute the file. Accordingly, in the case where the file cannot be executed by only a part of the file, the CRC extractor 140 may extract the CRC data from the front, middle and rear portions of the file as shown in FIG. 4.

However, if only the header part of the file is normally present, the video file, the image file, the compressed file, and the like can be executed with only a part of the file even if the file is not intact. Therefore, when the file to be accessed is a file executable only by a part of a file such as a video, an image, or a compressed file, the CRC extractor 140 extracts CRC data from a plurality of sections of the front part of the file as shown in FIG. 5. can do. By doing this, even if only a part of the file is executed, it is possible to determine whether it corresponds to an illegal content.

The blocking unit 150 compares the CRC data extracted from the file with the blocking target CRC data of the blocking target database 125 (S160). In this case, since the CRC data of the blocking target database 125 is converted from the CRC data received from the blocking management server 200 using a key value dependent on the user, the CRC data extracted from the file is blocked. It cannot directly compare with the blocking target CRC data of (125).

The blocking unit 150 converts the CRC data extracted from the file using a key value dependent on the user, and compares the converted CRC data with the blocking target CRC data.

In another embodiment, the blocking target CRC data stored in the blocking target database 125 may be inversely converted using a key value dependent on the user, and then compared with the CRC data extracted from the file.

The blocking unit 150 terminates the process of accessing the file when any one of the blocking target CRC data of the blocking target database 125 corresponds to the CRC data extracted from the file (S170). For example, when the video player accesses the video file to be blocked, the blocker 150 terminates the video player.

As a result, when the blocked target content registered in the blocked target database 125 is accessed, the process is terminated, thereby effectively blocking the blocked target content.

If the CRC data extracted from the file does not correspond to the blocking target CRC data of the blocking target database 125, the blocking unit 150 allows the process to access the file (S180), so that the contents are normally. Let it play

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

Claims (12)

What is claimed is: 1. A method of preventing access to illegal content in an electronic terminal, the method comprising:
Receiving blocking target CRC data from the blocking management server;
Converting the received blocking target CRC data using a key value dependent on a user;
Storing the converted blocking target CRC data in a database;
Detecting that the process has access to the file;
Extracting CRC data of some sections of the file accessed by the process; And
And terminating the process if the extracted CRC data corresponds to the blocking target CRC data stored in the database.
The method of claim 1,
The converting step
And encrypting the received blocking target CRC data using a key value dependent on the user.
The method of claim 1,
The terminating step is
Converting the extracted CRC data using a key value dependent on the user; And
And terminating the process if the converted CRC data is the same as the blocking target CRC data stored in the database.
The method of claim 1,
The terminating step is
Inversely converting the blocking target CRC data stored in the database using a key value dependent on the user; And
And terminating the process if the extracted CRC data is the same as the inverted blocked target CRC data.
The method of claim 1,
The extracting step
And extracting CRC data of at least three or more sections of the file.
The method of claim 5, wherein
Extracting CRC data in at least three sections of the file
And extracting CRC data in at least three sections determined according to the type of the file.
In the device for detecting and blocking the execution of illegal content,
A CRC receiver configured to receive blocking target CRC data from a blocking management server;
A database construction unit for converting the received blocking target CRC data using a key value dependent on a user and storing the converted blocking target CRC data in a database;
A monitoring unit detecting that the process accesses the file;
A CRC extraction unit for extracting a CRC value of a partial section of the file accessed by the process; And
And a blocking unit for terminating the process if the converted CRC value corresponds to a blocking target CRC value stored in the database.
The method of claim 7, wherein
The database construction unit
And encrypting the received blocking target CRC value using a key value dependent on the user and storing the encrypted CRC value in a database.
The method of claim 7, wherein
The blocking portion
And converting the extracted CRC value by using a key value dependent on the user, and terminating the process when the converted CRC value is the same as the blocking target CRC value stored in the database. .
The method of claim 7, wherein
The blocking portion
Inversely converting the blocking target CRC data stored in the database using a key value dependent on the user, and terminating the process when the extracted CRC data is the same as the inverted blocking target CRC data. Blocking device.
The method of claim 7, wherein
The CRC extractor
And extracting CRC data of at least three sections of the file.
A computer-readable recording medium having recorded thereon a program for implementing the method according to any one of claims 1 to 6.

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