KR100499056B1 - Screen capture prevention system and method for digital contents - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a system for preventing screen capture of digital works, a method thereof, and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides a screen capture prevention system through a system service conversion for protecting and preventing an attempt to illegally leak contents on the screen with respect to digital contents and an attempt to arbitrarily change the contents on the screen illegally. A method and a computer readable recording medium having recorded thereon a program for realizing the method are provided.

3. Summary of Solution to Invention

The present invention relates to a system for preventing screen capture of a digital asset, in which a system service used by all applications in a user environment detects a request for use of all system services and system functions requested by the respective applications. System service monitoring means for; System service analysis means for analyzing a system service call and a system function call requested by the system service monitoring means to analyze a service request pattern; System service control means for converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed by the system service analysis means; And system service response means for returning a response to the system service request converted by the system service control means to the screen capture application program.

4. Important uses of the invention

The present invention is used for digital asset protection / management services.

Description

Screen capture prevention system and method for digital contents

The present invention provides a screen capture prevention system and method using a system service conversion that can prevent screen capture of various digital assets such as digital documents, images, and video displayed on the screen on a computer system, and a program for realizing the method. The present invention relates to a computer-readable recording medium having recorded thereon.

In the social environment where the multimediaization of computer environment and the exchange of information through the Internet are rapidly increasing, the screen capture program is used as a method of illegal leakage and distribution of various digitally shaped works. Image information on the screen is imaged to leak, distribute, and alter information.

The conventional technology is a method of pre-storing a process list of a specific screen capture program and forcibly terminating the program when a process of the program is generated. This method does not inherently prevent screen capture. That is, it is not applicable to any screen capture program not listed or commercially available.

As such, the conventional Screen Capture Prevention System uses a method of preventing screen capture by obtaining a list of well-known screen capture applications and forcibly terminating a program corresponding to the list. Does not apply to randomly written screen capture programs or screen capture programs not listed. In addition, since the above method executes a forced termination of the program, there is a risk of instability of the user system.

Therefore, since the conventional technology cannot prevent the leakage of information displayed on the screen at the source, it is necessary to develop a system that can prevent the leakage of the screen information at the source.

The present invention has been proposed in response to the above-described demands, and is fundamentally protected from attempts to illegally leak the contents on the screen with respect to digital contents and illegally change the contents on the screen illegally. It is an object of the present invention to provide a screen capture prevention system through a system service conversion for preventing and a method thereof, and a computer-readable recording medium recording a program for realizing the method.

In order to achieve the above object, the present invention provides a system for preventing screen capture of a digital asset, using all system services and system functions requested by the respective applications for the system services used by all applications in the user environment. System service monitoring means for detecting a request for; System service analysis means for analyzing a system service call and a system function call requested by the system service monitoring means to analyze a service request pattern; System service control means for converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed by the system service analysis means; And a system service response means for returning a response to the system service request converted by the system service control means to the screen capture application program.

In addition, the present invention provides a screen capture prevention method applied to a screen capture prevention system, wherein the system services used by all application programs in a user environment are used for all system services and system functions that each application program requests to the system. Detecting a request; A second step of analyzing a service request pattern by analyzing a system service call and a system request that has been requested; A third step of converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed according to the analysis result of the second step; And a fourth step of returning the response to the converted system service request to the screen capture application program.

Meanwhile, the present invention provides a screen capture prevention system having a processor, which detects a request for the use of all system services and system functions requested by the respective applications for the system services used by all applications in the user environment. First function; A second function of parsing the detected requested system service and system function call to analyze a service request pattern; A third function of converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed according to the analysis result of the second function; And a computer readable recording medium having recorded thereon a program for realizing a fourth function of returning a response to the converted system service request to a screen capture application program.

The present invention relates to a screen capture prevention system and method, which is generally applied to all screen capture programs to prevent illegal leakage of digital content through screen capture and maintains stability that can prevent illegal changes of digital content. It detects service requests and function call patterns that attempt to capture screens by monitoring the system service calls and requests that all applications running on the operating system request to display and draw on the system. By replacing unspecified digital resources instead of on-screen digital resources to be protected in the program, screen leakage prevention and digital resources are protected.

As described above, the present invention intends to prevent screen capture so that it is not possible to leak screen information through system service monitoring and conversion for screen information that all application programs share and can easily access and leak information. To this end, the present invention by analyzing the pattern of the system services and function calls generated on the capture program for the screen capture and the general application program used in the user environment by analyzing how the respective program is operated and the general application program and screen Here's how to tell the difference between the capture programs. In addition, the present invention provides a technique and method for adjusting a response message and return values to prevent screen capture of a system service response.

According to the present invention, it is applicable to all information displayed on the screen, and can be applied to all digital content that should be prevented from leaking in drawings, documents, images, etc., to prevent the illegal leakage of digital content and to change randomly. have. Through this, copyright and property rights of various documents, drawings, images, etc., which are required for protection against leakage and illegal copying, are maintained and protected.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an embodiment of a screen capture prevention system according to the present invention.

The screen capture prevention system according to the present invention is a screen capture program for screening digital resources on the screen using system service monitoring and conversion to systematically and effectively prevent and protect illegal leakage and illegal tampering of various digital contents displayed on the screen. Protects from source. This can be divided into system service monitoring, control, and response functions.

The system service monitoring function monitors all services that an application program used in the user's computer environment requests to the user computer system, and monitors the use of system libraries and system functions.

The system service control function analyzes screen capture programs having a specific pattern through system service monitoring, and converts response of service requests and function calls of the screen capture programs.

The system service response function is to generate information returned as a result of service response and function call after system service control, and the purpose of the system service response function is to maintain the stability of the user computer.

As shown in FIG. 1, a screen capture prevention system for a digital asset according to the present invention is divided into a system service monitor 10, a system service control system 20, and a system service responder 30. The control system 20 is divided into a system service analyzer 21 and a system service controller 22.

Specifically, the screen capture prevention system for a digital asset according to the present invention, for the system services used by all the application programs in the user environment for each system application for the use of all system services and system functions A system service monitor 10 for detecting a request and a command, a system service analyzer 21 for analyzing a service request pattern by analyzing a system service and a system function call requested by the system service monitor 10, and A system service controller 22 for converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed by the system service analyzer 21; System service converted by The system includes a service transponder (30) to give back a response to the Agency in the screen capture application.

Screen capture prevention system for a digital asset according to the present invention, when a specific application requests screen information on the current computer system through the monitoring of the information when the information on the screen, the specific application for general use After determining whether a request is made to a system service or a system service for performing a screen capture, and in the case of a system service request for performing a screen capture, arbitrary information other than the information on the screen originally displayed to prevent the screen capture. Is passed to the program requesting screen capture in response to a request for a system service. That is, by monitoring a request for a system service, it is determined whether the requested content of the system service request is a screen capture request or a general screen display request, and if the request is for screen capture, the contents of the system service response. Is changed to arbitrary information, and the changed system service response is returned to the requesting application that originally requested the system service.

Then, the components of the screen capture prevention system for the digital asset according to the present invention will be described in more detail.

First, the system service monitor 10 performs all the monitoring for the two steps that occur when all the application programs in the user environment want to use the system service. In other words, application programs in the user environment request system services to access and use shared information and accessible memory areas, and these system services load system libraries embedded in the system. The monitor 10 detects a load situation of a specific system library and also monitors a state of a library that is already loaded. The system service monitor 10 also monitors system functions that applications in the user environment call to use system services. These system functions are functions that are built into the loaded system library and monitor whether the application program in the user's environment is invoking the call for specific system functions in a particular library.

The system service monitor 10 includes a system library monitor 11 and a system function monitor 12.

Here, the system library monitoring unit 11 is a module that monitors system libraries required for all application programs in a user environment to use system services. The system library screen system prevents screen capture. Monitor system libraries associated with a service.

The system function monitoring unit 12 monitors all system functions that all application programs in the user environment call to actually use the system service. In other words, all system functions related to screen information are monitored to prevent screen capture.

On the other hand, the system service analyzer 21 analyzes the request of the application program of the user environment for the system service to be monitored. That is, the system service analyzer 21 may use any service based on information detected by the system service monitor 10 when a call to a system library and a system function to be monitored is generated by an application program of a user environment. Analyze if a request occurred. The system service analyzer 21 then analyzes whether the system service pattern generated by the application program of the user environment is a service request pattern generated in a general application program situation or a service request pattern requested by the screen capture application. The pattern analysis result for the system service request is passed to the system service controller 22.

The system service analyzer 21 includes a service request analyzer 211 and a service pattern analyzer 212.

Here, the service request analysis unit 211 analyzes the request for the system service to be monitored through the system service monitor 10, and determines whether the system service request is a system request related to the screen information. The process is passed to the system service pattern analyzer 212. Then, the service pattern analysis unit 212 analyzes the pattern of the request items passed through the system service request analysis unit 211, and analyzes whether the system service request for screen capture or the system service request for general use. .

On the other hand, the system service controller 22 controls the system service with the result passed by the system service analyzer 21. In this case, if the system service request is generated by a general application program, no specific control is applied to the system service. On the other hand, in the case of a system service request generated by the screen capture application, the screen capture application generates randomly determined information different from the current screen information to meet the request of the screen capture application, and then the system service requests the request. Make sure you respond with the result.

As such, the system service controller 22 controls the system service based on the result analyzed by the system service analyzer 21. That is, the system service controller 22 includes a system service converting unit 221, and the system service converting unit 221 determines that the request for the system service requested by an application program for general use of the user environment. The result of the service analyzer 21 can be used for the purpose of system service. On the other hand, if the system service analyzer 21 analyzes that the system service requested by the screen capture application for screen capture, the system service is converted. At this time, the system service generated by the program that normally captures the content displayed on the screen is replaced by the new command code in the service response generator 31 newly input through the system service converter 221 to capture the actual screen area. Forcibly convert the command issued by the program to be executed. The screen-gap program calls a system service to copy the information of the screen area. These commands call the address of a function loaded in memory of the program that attempts to capture the screen. However, in the present invention, since the program that attempts to capture the screen converts the address of the called function, the original screen capture is not performed, and instead, any blank screen information that can replace the virtual screen or the screen area is provided instead. The data copied by the program that attempted to capture the screen is transferred to the replaced screen information instead of the information displayed on the screen. For example, in order to call a system function called BitBlt or CopyDC to control a display area, a screen capture program is called through a memory address address loaded with a function that performs a BitBlt or CopyDC function. This function prevents screen copying by converting a pointer to to replace a function that performs a different function on the new address. Through this conversion, the system service confirms that the converted information is information of the system service itself, and uses it as a result of the request of the system service.

On the other hand, the system service responder 30 delivers the converted system service generated by the system service controller 22 to the screen capture application program that requested the system service for screen capture.

As such, the system service responder 30 includes a service response generator 31 to interfere with the normal operation of all applications in the user environment in which the system service converted through the service response generator 31 is operating normally. In order to avoid this, it checks whether the configuration and format of the converted system service has the configuration and format of the original system service so as not to cause an error and returns it as a result of the request of the target application.

2 is a flowchart illustrating an embodiment of a method for preventing a screen capture according to the present invention.

As shown in FIG. 2, the method for preventing screen capture of a digital asset according to the present invention first includes two steps that occur when all the applications in the user environment want to use the system service in the system service monitor 10. Perform all monitoring (201). That is, one detects the loading status of a particular system library and monitors the status of a library that is already loaded. The other monitors system functions that applications in the user environment call to use system services.

Subsequently, when a call to a system library and a system function to be monitored by the service request interpreter 211 of the system service analyzer 21 is generated by an application program of a user environment, the system service monitor 10 may be used. Based on the detected information, it is analyzed what service request has occurred (202). Then, whether the pattern of the system service generated by the application program of the user environment in the service pattern analyzer 212 of the system service analyzer 21 is a service request pattern generated in a general application situation or the screen capture application requests It is interpreted whether it is a service request pattern (203).

Next, the system service controller 22 controls the system service with the result passed by the system service analyzer 21 (204). In this case, if the system service request is generated by a general application program, no specific control is applied to the system service. On the other hand, in the case of a system service request generated by the screen capture application, the screen capture application generates randomly determined information different from the current screen information to meet the request of the screen capture application, and then the system service requests the request. Make sure you respond with the result.

Finally, the system service responder 30 forwards the converted system service generated by the system service controller 22 to the screen capture application program that requested the system service for screen capture (205). That is, in order not to interfere with the normal operation of all applications in the user environment in which the converted system service is operating normally, the configuration and format of the converted system service have the configuration and format of the original system service so that no error occurs. It checks and returns it as the result of the request of the target application.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

The present invention as described above, the screen in the original use so that digital resources, such as various digital documents, images, videos, etc. that should not be infringed by the information on the screen and copyright to be protected are illegally leaked to prevent illegal distribution or tampering Through the capture program, digital resources can be prevented from being copied illegally, and the information can be stably displayed on the screen while the digital resources can be shared by preventing illegal leakage, duplication, and tampering of digital resources through screen capture. Has the effect of preventing piracy, leaks and tampering that could potentially infringe.

1 is a block diagram of an embodiment of a screen capture prevention system according to the present invention.

2 is a flowchart illustrating an embodiment of a screen capture prevention method according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: system service monitor 20: system service control system

30: system service responder

Claims (8)

In the screen capture prevention system for digital assets, System service monitoring means for detecting a request for use of all system services and system functions that each application program requests to the system for system services used by all application programs in the user environment; System service analysis means for analyzing a system service call and a system function call requested by the system service monitoring means to analyze a service request pattern; System service control means for converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed by the system service analysis means; And System service response means for returning the response to the system service request converted by the system service control means to the screen capture application program. Screen capture prevention system for a digital asset comprising a. The method of claim 1, The system function is A screen capture prevention system for a digital asset, wherein all applications in the user's environment are functions built into the system library that are called to actually use the system service. The method of claim 1, The system service analysis means, A service request analysis unit for analyzing a request for a system service to be monitored through the system service monitoring unit, and determining whether the system service request is a system request related to screen information; And Service pattern analysis unit for analyzing the pattern of the request delivered through the system service request analysis unit, whether the system service request for screen capture or the system service request for general use Screen capture prevention system for a digital asset comprising a. The method according to any one of claims 1 to 3, The system service control means, The result of the system service analysis means, which is determined to be a request for a system service requested by an application program for general use of the user environment, may be used for the purpose of system service, and a screen capture application may be used for screen capture. If the system service analyzing means analyzes the requested system service, the system service is converted. In this case, the system service conversion is used by the system service by replacing screen information currently displayed on the screen with arbitrary designated information to prevent screen capture. Screen capture prevention system for digital assets, characterized in that the conversion. The method of claim 4, wherein The system service response means, In order not to interfere with the normal operation of all applications in the user's environment where the converted system services are operating normally, verify that the configuration and format of the converted system services have the configuration and format of the original system services to avoid errors. And returning it as a result of the request of the target application. In the screen capture prevention method applied to the screen capture prevention system, A first step of detecting requests for use of all system services and system functions that each application requests to the system for system services used by all applications in the user environment; A second step of analyzing a service request pattern by analyzing a system service call and a system request that has been requested; A third step of converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed according to the analysis result of the second step; And A fourth step of returning a response to the converted system service request to a screen capture application; Screen capture prevention method for a digital asset comprising a. The method of claim 6, The third step, As a result of the analysis of the second step, the system service can be used as an original use of the application program for the general use of the user environment, and the system service is converted upon request of the screen capture application for the screen capture. A method for preventing screen capture for a digital asset, comprising converting screen information displayed on the current screen into a form used by a system service to prevent screen capture during service conversion. Screen capture prevention system with a processor, A first function for detecting a request for use of all system services and system functions that each application requests to the system for system services used by all applications in the user environment; A second function of parsing the detected requested system service and system function call to analyze a service request pattern; A third function of converting a system service and a system function call recognized as a request of a screen capture program into arbitrary processing information through a system service pattern analyzed according to the analysis result of the second function; And A fourth function of returning a response to the converted system service request to a screen capture application; A computer-readable recording medium having recorded thereon a program for realizing this.