KR20190029330A - Method for displaying watermark in screen and apparatus therefor - Google Patents

Abstract

The present invention relates to a method of displaying a watermark in a certain area of a screen being output and a device therefor. One or more processors, in accordance with an embodiment of the present invention; A display device; A memory and a program stored in the memory and configured to be executed by the one or more processors, the program comprising: an information acquiring module acquiring identification information of the electronic device; And a first watermark generation module generating a first watermark including the acquired identification information and displaying the first watermark on a top layer in a predetermined area of a screen being output from the display device.

Description

[0001] METHOD FOR DISPLAYING WATERMARK IN SCREEN AND APPARATUS THEREFOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watermarking technique, and more particularly, to a method and apparatus for displaying a watermark in a certain area of a screen being output at present.

A watermark is a technique of inserting a certain code into a content in order to prevent illegal copying and illegal use of the copyrighted work. Such a watermark is inserted as a constant code in the digital content, and is also output as a specific symbol to the printed matter. Watermark is used to protect creations and identify replication paths. The following patent document discloses a watermark embedding and detection method.

However, although the watermark embedding technique can protect the distribution of the printed matter and the digital contents, there is a problem in that it is difficult to protect the copyright on the captured image when the computer screen is photographed and leaked to the outside, . For example, when another user having a malicious intention takes a picture of a computer screen on a smartphone and a captured image or an image is leaked to the outside while the user is idle during use of the personal computer, Documents, etc.) may be infringed. In particular, when the voyeurized image is security data used in an in-house computer network, there is a problem that the security of the in-house computer network is damaged from the external hacking. Accordingly, there is a demand for security enhancement for content being output from a digital screen such as a computer screen.

Korean Patent Publication No. 10-2010-0091765

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such conventional problems, and it is an object of the present invention to provide a screen watermark display method in which a watermark is recorded on a screen of an electronic device used by a user, And an apparatus therefor.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to a first aspect of the present invention, there is provided a system comprising: at least one processor; A display device; Memory; And a program stored in the memory and configured to be executed by the one or more processors, the program comprising: an information acquiring module acquiring identification information of the electronic device; And a first watermark generation module generating a first watermark including the acquired identification information and displaying the first watermark on a top layer in a predetermined area of a screen being output from the display device.

Wherein the information acquiring module acquires index information and the program selects a pixel region for inserting a second watermark in the output screen, and based on the bit stream included in the index information, The second watermark generation module may further include a second watermark generation module that changes the brightness of the pixel to record the second watermark in hidden form on the screen.

The second watermark generation module performs a one-to-one correspondence between the pixels included in the pixel region and each bit included in the bit string, and sets the brightness of the pixel matched with the bit '1' The second watermark can be recorded on the screen by changing the brightness relatively to the brightness of the matched pixel.

The index information is a bit string generated based on the MAC address of the electronic device, and the information acquisition module may generate the index information itself or obtain the index information from the management server.

The second watermark generation module may analyze a graphic image being output on the screen to identify a color boundary and select a pixel region in which the second watermark is inserted from the pixels constituting the color boundary .

The second watermark generation module analyzes the graphic image being output on the screen to identify consecutive pixels having a brightness lower than a predetermined threshold brightness, and inserts the second watermark among the consecutive pixels Pixel area can be selected.

The program may further include an interference processing module for monitoring whether or not an input signal is generated on the first watermark and for transmitting the input signal to an application of a lower layer.

The first watermark generation module may generate and display a first watermark including at least one of a MAC address, an IP address, and a host name of the electronic device and current time information.

According to a second aspect of the present invention, there is provided a method of displaying a watermark on a screen being output from an electronic device, comprising: obtaining identification information of the electronic device; Generating a first watermark including the acquired identification information; And displaying the first watermark as a top layer in a certain area of the screen being output.

The method includes: obtaining index information; Selecting a pixel region for inserting a second watermark in the output screen; And recording the hidden second watermark on the screen by changing the brightness of the pixels included in the pixel area based on the bit string included in the index information.

The present invention has the advantage of enhancing the copyright of digital contents from the screen voyeur and improving internal security by expressing identifiable watermarks in a certain area of the electronic device screen in the form of the top layer.

Further, the present invention is advantageous in that it can additionally record hidden watermarks that can not be identified by the user on the electronic device screen, so that even if the voyeurized image is distorted, the source of the sneaky image and the copyright holder can be grasped through the hidden watermark .

In addition, when an input signal is generated in a watermark displayed on an electronic device screen, the input signal is processed as an input signal of an application existing in a lower layer so that input signal interference It is advantageous in that the convenience of the user is improved.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
1 is a diagram illustrating a screen watermark display system according to an embodiment of the present invention.
2 is a diagram showing a configuration of an electronic apparatus according to an embodiment of the present invention.
3 is a diagram showing a configuration of a watermark program according to an embodiment of the present invention.
4 is a diagram illustrating a screen on which a watermark is displayed according to an embodiment of the present invention.
5 is a diagram illustrating a process of inserting a second watermark according to an embodiment of the present invention.
6 is a flowchart illustrating a method of generating a watermark in an electronic device and inserting it into a screen according to an embodiment of the present invention.
7 is a flowchart illustrating a method for preventing input interference according to a watermark in an electronic device according to an exemplary embodiment of the present invention.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a screen watermark display system according to an embodiment of the present invention.

1, the screen watermark display system includes an electronic device 100 and a management server 200, and the electronic device 100 and the management server 200 And communicate with each other via the network 300. [ Here, the network 300 includes a mobile communication network and a wired network, and corresponds to a well-known conventional technology in the present invention, and thus a detailed description thereof will be omitted.

The management server 200 stores a watermark program and provides a service for downloading a watermark program to the electronic device 100. A user who has downloaded the watermark program, a user ID including a MAC address, an IP address, Store and manage information. In addition, the management server 200 may allocate and manage index information for each electronic device, and may provide the index information to the electronic device 100. The index information is a unique bit string of the electronic device 100 allocated to an electronic device, and is utilized as a base data for generating a secret watermark.

The management server 200 receives and stores a MAC address, an IP address, a user ID, and an electronic device name from the electronic device 100 installed with the watermark program. When the management server 200 receives the MAC address from the electronic device 100, the management server 200 generates index information based on the MAC address, stores the index information together with the user information, and provides the index information to the electronic device 100 have. At this time, the management server 200 can generate index information by using the MAC address as a seed. In addition, the management server 200 analyzes the captured image, identifies the watermark in the captured image, and identifies the electronic device 100 through the watermark, thereby grasping the source of the captured image.

The electronic device 100 is a device in which a watermark program is installed, and inserts a watermark on the screen currently being output, thereby recording the source for the screen image itself. The electronic device 100 outputs a watermark which can be visually recognized and which is semi-transparently processed on the screen, in a predetermined area of the screen, and additionally displays a hidden watermark which can not be visually recognized and generated by the index information, It is inserted in a certain area. The electronic device 100 can download the watermark program from the management server 200 and install the watermark program. The electronic device 100 may be a notebook computer, a desktop computer, a tablet computer, an IPTV, a smart phone, and the like, and may be any device capable of outputting multimedia, text, and the like to a screen.

2 is a diagram showing a configuration of an electronic apparatus according to an embodiment of the present invention.

2, an electronic device 100 according to an embodiment of the present invention includes a memory 110, a memory controller 121, one or more processors (CPU) 122, a peripheral interface 123, (I / O) subsystem 130, a display device 141, an input device 142, and a communication circuit 152. These components communicate through one or more communication buses or signal lines. The various components shown in FIG. 2 may be implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and / or application specific integrated circuits.

The memory 110 may include a high-speed random access memory and may also include one or more magnetic disk storage devices, non-volatile memory such as a flash memory device, or other non-volatile semiconductor memory device. In some embodiments, the memory 110 may include a storage device, e.g., a communication circuit 152, located remotely from the one or more processors 122, and an Internet, Intranet, Local Area Network (WLAN) , A Storage Area Network (SAN), or the like, or any suitable combination thereof, via a network (not shown). Access to the memory 110 by other components of the electronic device 100, such as the processor 122 and the peripheral interface 123, may be controlled by the memory controller 121.

The peripheral interface 123 connects the input / output peripheral device of the electronic device 100 with the processor 122 and the memory 110. The one or more processors 122 execute various software programs and / or a set of instructions stored in the memory 110 to perform various functions for the communication terminal 10 and process the data. In some embodiments, peripheral interface 123, processor 122, and memory controller 121 may be implemented on a single chip, such as chip 120. In other embodiments, they may be implemented as separate chips.

The I / O subsystem 130 provides an interface between the input / output peripheral of the electronic device 100, such as the display device 141, the input device 142, and the peripheral interface 123.

The display device 141 may be a liquid crystal display (LCD) technology or a light emitting polymer display (LPD) technology. The display device 141 may be capacitive, resistive, infrared, or the like. The touch display provides an output interface and an input interface between the terminal and the user. The touch display displays a visual output to the user. The visual output may include text, graphics, video, and combinations thereof. Some or all of the visual output may correspond to a user interface object. The touch display forms a touch sensitive surface that accommodates user input.

The input device 142 is an input means such as a keyboard, a mouse, and the like, and receives a user's input signal.

The processor 122 is a processor configured to perform operations associated with the electronic device 100 and to perform the instructions and to perform operations such as input and output between components of the electronic device 100 using the instructions retrieved from the memory 110, Reception and manipulation of data can be controlled.

The communication circuit 152 transmits / receives a signal to / from the wire or wirelessly transmits / receives an electromagnetic wave. The communication circuit 152 converts electrical signals to electromagnetic waves and vice versa, and communicates with the communication network, other mobile gateways, and electronic devices through the electromagnetic waves. The communication circuit 152 includes, for example, an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a CODEC chipset, a subscriber identity module And may include well-known circuits for performing such functions without limitation. The communication circuitry 152 may be any of a variety of communication networks, including the Internet, referred to as the World Wide Web (WWW), a network such as an intranet and / or a cellular telephone network, a wireless LAN and / or a metropolitan area network It can communicate with other devices by communication. The wireless communication may be implemented in a variety of communication systems such as Global System for Mobile Communications (GSM), Enhanced Data GSM Environment (EDGE), wideband code division multiple access (WCDMA), code division multiple access (CDMA), time division multiple access (TDMA) Protocol, Wi-MAX, Bluetooth, zigbee, and Near Field Communication (NFC).

The software components may be installed in the memory 110, such as an operating system 111, a graphics module (instruction set) 112, and a watermark program (instruction set). The operating system 111 may be an embedded operating system such as, for example, Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS or VxWorks, Android, Management, storage control, power management, etc.), and facilitates communication between the various hardware and software components. Graphics module 112 includes a number of well known software components for providing and displaying graphics on display device 141. The term "graphics" includes, without limitation, text, web pages, icons (e.g., user interface targets including soft keys), digital images, video, animations, .

The watermark program 113 can be downloaded from the management server 200 and installed. The watermark program 113 generates a watermark and a concealed watermark in which identification information and time information of the electronic device 100 are displayed and outputs the watermark to the display device 141. [

Hereinafter, a watermark which can be visually recognized and opacently displayed in the form of a top layer is referred to as a first watermark, and a watermark which can not be recognized by the naked eye and is inserted into a specific area on the screen due to a brightness difference is referred to as a second watermark .

3 is a diagram showing a configuration of a watermark program according to an embodiment of the present invention.

3, the watermark program 113 according to an embodiment of the present invention includes an information acquisition module 31, a first watermark generation module 32, a second watermark generation module 33, An interference processing module 34, and each module can be mounted on the electronic device 100 when the watermark program is installed.

The information acquisition module 31 acquires identification information of an electronic device such as a MAC address, an IP address, and an electronic device name (e.g., a host name) of the electronic device 100. Also, the information acquisition module 31 can acquire the company name to which the user belongs. The company name and the computer name can be input from the user when the watermark program is installed or can be obtained through the host name and belonging name (or group name) recorded in the operating system 111.

Also, the information acquisition module 31 may receive index information from the management server 200. In this case, the information acquisition module 31 may provide the MAC address of the electronic device 100 to the management server 200, and may receive the index information generated based on the MAC address from the management server 200. In another embodiment, the information acquisition module 31 may generate index information on the basis of the MAC address of the electronic device 100 itself. The index information may be a bit string that is equal to or shorter than the length of the MAC address, and may be a bit string generated by using the MAC address as a seed. Also, the index information may be a MAC address. In this case, the information acquisition module 31 does not request index information to the management server 200, but uses the MAC address itself as index information.

The first watermark generation module 32 generates a first watermark on the basis of the device identification information acquired by the information acquisition module 31 and displays the first watermark in a predetermined area of the screen of the display device 141 do. That is, the first watermark generation module 32 generates the first watermark including the device identification information acquired by the information acquisition module 31, that is, MAC address, IP address, electronic device name (e.g., host name) And displays the first watermark in a predetermined area of the display device 141 in the form of a top layer. At this time, the first watermark generation module 32 can display the same in the plurality of areas of the display device 141, and updates the time information displayed in the first watermark in real time. The number and the area in which the first watermark is displayed can be set by the user and automatically set when the watermark program 113 is installed.

In addition, the first watermark generation module 32 may process the first watermark in an opaque manner according to a previously set transparency, and output it to the uppermost layer of the display device 141. The transparency setting for the first watermark can be set by the user or automatically when the watermark program 113 is installed. As the first watermark is displayed on the uppermost layer, it is always exposed on the screen of the display device 141 regardless of what the user performs.

4 is a diagram illustrating a screen on which a watermark is displayed according to an embodiment of the present invention.

4, the first watermark generation module 32 includes first watermarks 41a and 41b including a MAC address, an IP address, an electronic device name (e.g., a host name), and time information And outputs it as a top layer in the upper center area of the screen and the lower right area of the screen. The first watermarks 41a and 41b are opaque according to the set transparency, and the application displayed on the immediately following layer is exposed. In addition, the first watermark generation module 32 updates the time information included in the first watermark in real time. That is, the first watermark generation module 32 synchronizes the actual time and the time information output to the first watermarks 41a and 41b.

In the state where the first watermark is output to the display device 141, even if another person secretly photographs the screen, the first watermark 41a or 41b is recorded in the captured screen image, The image source and the outflow route can be grasped.

The second watermark generation module 33 performs a function of inserting a second watermark not recognized by the naked eye into a specific area of the screen based on the index information. Specifically, the second watermark generation module 33 analyzes the screen image currently displayed on the display device 141, and selects an area into which the second watermark is inserted.

In one embodiment, the second watermark generation module 33 analyzes the screen image output from the current display device 141, checks consecutive pixels darker than the preset threshold brightness in the screen image, A region in which the second watermark is inserted is selected. At this time, the second watermark generation module 33 selects pixels having the same length as the bit string length of the index information among the continuous pixels, and selects the selected pixels as a region into which the second watermark is inserted do. For example, when the bit string of the index information is 48 bits, the second watermark generation module 33 designates 48 consecutive pixels out of consecutive pixels that are darker than the critical brightness, Can be selected. In addition, the second watermark generation module 33 may select a plurality of insertion areas, and may limit the number of insertion areas to be selected to a maximum number (for example, 10) when the area less than the threshold brightness is too large . The second watermark generation module 33 checks RGB (red-green-blue) of each pixel in the screen image and converts the RGB values of each pixel into a hue-saturation-brightness (HSB) , It is possible to identify consecutive pixels that are darker than the critical brightness among consecutive pixel regions based on the HSB value.

As another example, the second watermark generation module 33 may check the RGB values of each pixel in the screen image, analyze the RGB values to identify the color boundary, and then, The second watermark embedding area may be selected. At this time, the second watermark generation module 33 selects consecutive pixels having a length equal to the length of the bit string of the index information among the pixels forming the color boundary, as a region into which the second watermark is inserted. The second watermark generation module 33 can recognize a pixel region in which a difference between RGB values is greater than a threshold value than a surrounding RGB value as a color boundary.

In yet another embodiment, one or more pixel regions into which a second watermark is to be inserted may be preset, in which case the second watermark generation module 33 identifies a second predetermined watermark pixel region, The insertion area of the second watermark can be selected from the screen image.

In FIG. 4, reference numerals 42a and 42b denote a second watermark embedding area, and the second watermark embedding area may be selected more than one in the screen image.

When the insertion area is selected, the second watermark generation module 33 records the hidden second watermark in the insertion area. At this time, the second watermark generation module 33 checks the bit string included in the index information, and one-to-one matches the bit string with the pixel of the insertion area, and then sets the brightness of the pixel matched with the bit '1' Quot; 0 " bit and the second watermark can be recorded in the corresponding insertion area.

5 is a diagram illustrating a process of inserting a second watermark according to an embodiment of the present invention.

Assuming that the index information is '1010011001', referring to FIG. 5, for example, the second watermark generation module 33 matches each pixel of the insertion area with the bits of the index information one by one, The brightness of the pixel matched with the bit '1' in the pixel is changed to be relatively higher than the neighboring pixel matched with the '0' bit (that is, the pixel matched with the '0' bit and located closest to the bit '1'). As shown in FIG. 5, the second watermark generation module 33 calculates the brightness of the pixel matched with the bit '1' to a predetermined value (for example, 20%) which is lower than the brightness of the pixel matched with the bit ' ), The RGB value or the HSB value of the corresponding pixel can be changed.

As described above, the brightness of the pixel is changed according to the bit string of the index, and the second watermark is inserted into the hidden form like a barcode. The display of the area of the second watermark is difficult for the user to visually confirm through the screen and can be identified through the analysis of the management server 200. [ That is, the management server 200 identifies an area in which the second watermark is inserted in the photographed image, and extracts index information (i.e., bit string) through the brightness difference in the second watermark embedding area. Then, the management server 200 can check the electronic device 100 corresponding to the index information in the database, and can grasp the source of the photographed image.

On the other hand, the second watermark generation module 33 can select a plurality of watermark embedding areas and insert the same second watermark into each embedding area through changing the brightness of a plurality of embedding areas. The plurality of inserting areas may be selected to be adjacent to the top / bottom or left / right of the pixel area of the screen, and may be located in the non-adjacent space. In this case, the second watermark generation module 33 may insert the same second watermark in each insertion area. When the same second watermark is inserted into the plurality of areas, even if the sneaky image for the specific area is distorted, the electronic device 100 can be identified through the second watermark inserted in the other area.

The interference processing module 34 performs a function of preventing an input interference phenomenon caused by the watermark displayed on the uppermost layer. That is, when a touch or a mouse is input on the first watermark, the interference processing module 34 transmits the input signal to an application (i.e., a window or a menu) located on a back layer of the first watermark, And another input window is overlapped with another window.

6 is a flowchart illustrating a method of generating a watermark in an electronic device and inserting it into a screen according to an embodiment of the present invention.

Referring to FIG. 6, when the electronic device 100 operates, the information acquisition module 31 collects and acquires identification information of electronic devices such as a MAC address, an IP address, and an electronic device name (S601).

Then, the first watermark generation module 32 generates a first watermark including the MAC address, the IP address, the name of the electronic device (e.g., host name) and the current time information acquired by the information acquisition module 31 , And the first watermark is displayed as a top layer on the screen fixed area of the display device 141 (S603 and S605). At this time, the first watermark generation module 32 can simultaneously display the first watermark on a plurality of areas. Further, the first watermark generation module 32 may oppose the first watermark on the uppermost layer of the screen based on the set transparency. In addition, the first watermark generation module 32 synchronizes the time information indicated by the first watermark with the current time, thereby causing the time information recorded in the first watermark to change in real time.

Next, the information acquisition module 31 generates index information based on the second watermark generation itself or acquires the index information in cooperation with the management server 200 (S607). The information acquisition module 31 provides the MAC address of the electronic device 100 to the management server 200 and receives the index information generated based on the MAC address from the management server 200. [ Alternatively, the information acquisition module 31 may generate the index information on the basis of the MAC address of the electronic device 100 itself. As another embodiment, the information acquisition module 31 may obtain the MAC address itself as index information.

Then, the second watermark generation module 33 analyzes the screen image currently displayed on the display device 141, and selects a region into which the second watermark is inserted (S609).

In one embodiment, the second watermark generation module 33 identifies consecutive pixels that are darker than the predetermined threshold brightness in the screen image, and determines the length of the bit string of the index information among the consecutive pixels as the corresponding pixels It is possible to select an area into which the second watermark is inserted. At this time, the second watermark generation module 33 checks RGB (red-green-blue) of each pixel in the screen image, converts the RGB value of each pixel into a hue-saturation-brightness (HSB) It is possible to confirm the HSB value and identify consecutive pixels darker than the critical brightness among consecutive pixel areas based on the HSB value.

As another example, the second watermark generation module 33 may check the RGB values of each pixel in the screen image, analyze the RGB values to identify the color boundary, and then, The pixels corresponding to the bit string length of the index information can be selected as the region into which the second watermark is inserted. The second watermark generation module 33 can recognize that the pixel region in which the RGB value is different from the surrounding RGB value by more than the threshold value is the color boundary.

As another embodiment, the pixel areas into which the second watermark is inserted can be preset, in which case the second watermark generation module 33 identifies the second predetermined watermark pixel area, The insertion area of the watermark can be selected from the screen image.

The second watermark generation module 33 can select a plurality of second watermark embedding areas.

When the insertion area is selected, the second watermark generation module 33 inserts the hidden second watermark into the insertion area (S611). At this time, the second watermark generation module 33 checks the bit string included in the index information, and one-to-one matches each bit of the bit string with the pixel of the insertion area, and then calculates the brightness of the adjacent pixel matched with '0' The brightness of the pixel matched to '1' is changed to be higher and the second watermark is recorded in the corresponding insertion area.

The process according to FIG. 6 corresponds to one cycle of a watermark, and the second watermark may be periodically generated and inserted into a screen image when a screen switching event occurs. That is, when a screen switching event occurs in which a specific operation window such as MS Word, Hangul, Power Point, Excel, Photoshop, etc. is newly displayed on the screen, or when a new web browser is created by accessing an intra- 2 watermark generation module 33 may analyze the screen image and insert a new watermark into the current screen image.

7 is a flowchart illustrating a method for preventing input interference according to a watermark in an electronic device according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the interference processing module 34 monitors an input signal generated in the electronic device 100 (S701). That is, the interference processing module 34 monitors a mouse input signal, a touch input signal, and the like generated in the electronic device 100.

Next, when the input signal is generated, the interference processing module 34 determines whether or not the input signal is an input signal generated on the first watermark (S703). If the input signal is an input signal that does not occur on the first watermark, So that the operation of the electronic device 100 is processed according to the input signal.

On the other hand, if the generated input signal is an input signal generated on the first watermark, the interference processing module 34 transfers the input signal to the application located in the subsequent layer of the first watermark, Thereby preventing an input interference phenomenon that occurs when the screen overlaps with the watermark (S705).

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described in the singular < Desc / Clms Page number 5 > embodiments herein may be implemented in various embodiments individually or in combination as appropriate.

Although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that all described operations are performed to obtain a sequence of sequential orders, or a desired result . In certain circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

The method of the present invention as described above can be implemented by a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto optical disk, etc.). Such a process can be easily carried out by those skilled in the art and will not be described in detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

100: electronic device 110: memory
111: Operating system 112: Graphics module
113: Watermark program 121: Memory controller
122: CPU 123: peripheral interface
130: I / O subsystem 141: Display device
142: input device 152: communication circuit
200: management server 300: network
31: information acquisition module 32: first watermark generation module
33: second watermark generation module 34: interference processing module

Claims (13)

One or more processors;
A display device;
Memory; And
An electronic device including a program stored in the memory and configured to be executed by the one or more processors,
The program includes:
An information acquisition module for acquiring identification information of the electronic device; And
And a first watermark generation module that generates a first watermark including the acquired identification information and exposes the first watermark to a highest layer in a predetermined area of a screen being output from the display device . The method according to claim 1,
The information acquisition module acquires index information,
The program includes:
Selecting a pixel region for inserting a second watermark in the output screen and changing a brightness of a pixel included in the pixel region based on a bit string included in the index information to generate a hidden second watermark And a second watermark generation module for recording the watermark on the screen. 3. The method of claim 2,
Wherein the second watermark generation module comprises:
The pixels included in the pixel region are matched one-by-one with the bits included in the bit string, and the brightness of the pixel matched with the bit '1' among the matched pixels is relatively more bright than the brightness of the pixel matched with the bit '0' And said second watermark is recorded on said screen. 3. The method of claim 2,
Wherein the index information is a bit string generated based on a MAC address of the electronic device,
Wherein the information acquisition module generates the index information by itself or acquires the index information from the management server. 3. The method of claim 2,
Wherein the second watermark generation module comprises:
Analyzing a graphic image being output on the screen to identify a color boundary surface and selecting a pixel region in which the second watermark is to be inserted among the pixels constituting the color boundary surface. 3. The method of claim 2,
Wherein the second watermark generation module comprises:
The graphic image being outputted on the screen is analyzed to identify consecutive pixels having a brightness lower than a preset threshold brightness and the pixel region for inserting the second watermark is selected among the consecutive pixels Lt; / RTI > 7. The method according to any one of claims 1 to 6,
The program includes:
And an interference processing module for monitoring whether or not an input signal is generated on the first watermark and for transmitting the input signal to an application of a lower layer when the input signal is generated. 7. The method according to any one of claims 1 to 6,
Wherein the first watermark generation module comprises:
And the first watermark is exposed by opaque processing. 7. The method according to any one of claims 1 to 6,
Wherein the first watermark generation module comprises:
And generating and displaying a first watermark including at least one of a MAC address, an IP address, and a host name of the electronic device and current time information. A method of displaying a watermark on a screen being output from an electronic device,
Obtaining identification information of the electronic device;
Generating a first watermark including the acquired identification information; And
And displaying the first watermark as a top layer in a certain region of the screen being output. 11. The method of claim 10,
Acquiring index information;
Selecting a pixel region for inserting a second watermark in the output screen; And
And recording the hidden second watermark on the screen by changing the brightness of the pixel included in the pixel area based on the bit string included in the index information. Way. The method according to claim 10 or 11,
After the exposing step,
Monitoring whether an input signal occurs on the first watermark; And
And transmitting the input signal to an application of a lower layer when the monitoring result input signal is generated. The method according to claim 10 or 11,
Wherein the step of exposing comprises:
Wherein a first watermark including at least one of a MAC address, an IP address, and a host name of the electronic device and current time information is generated and displayed.

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