KR101919286B1 - method of preventing copying online image on webserver - Google Patents

Abstract

A method for preventing image copy on a webserver according to the present invention includes: a first step of receiving an image request from a client, judging whether the image request is legitimate, and loading a target image; a second step of generating a first random number and dividing the target image into a first group of images including sub images having a size randomly determined according to the first random number, in a predetermined order; a third step of generating a second random number and generating a second image group by randomly changing the order of the sub images of the first image group according to the second random number; a fourth step of rearranging and rearranging the sub images of the second image group and storing reconstruction information for displaying the target image; and a fifth step of sequentially transmitting the sub images of the second image group to the client and transmitting the restoration information to the client if the image request is legitimate.

Description

A method for preventing image copying on a web server {method of preventing copying online image on webserver}

The present invention relates to an image copy prevention method, and more particularly, to a method for preventing image copying in a web server for illegally copying an image on-line to prevent distribution and distribution of the image.

In the past, people downloaded images on-line in order to duplicate and use online images. Recently, however, due to the development of technology, a tool developed by a web crawl, a web grabber program, a script language, (Collectively referred to as "images") can be automatically downloaded.

The advantage of this approach is that a large amount of images can be easily and quickly downloaded and stored on the user's client simply by a few clicks or manipulations. As such programs are widely used illegally, companies or individuals who provide copyrighted images on the web are experiencing serious property damage due to unauthorized image leakage, and serious problems such as a decrease in motivation of the creators .

A typical example of such an incident is illegal downloading and illegally downloading the image of Webtoon provided by a legitimate webtoon service server in a webtoon illegal distribution site such as 'chestnut rabbit', illegally distributing and distributing it, resulting in illegal profits of several hundred billion won The incident occurred. In this way, illegal image duplication through web server has become a serious problem in social / cultural / economical.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a method for preventing copying of images in a web server, which can prevent unauthorized copying and utilization of images on-line by using illegal programs.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided a method for preventing image copying in a web server, the method comprising: receiving an image request from a client; determining whether the image request is legitimate; A first random number generating unit that generates a first random number and divides the target image into a first image group including sub images having a size randomly determined according to the first random number according to a predetermined ordering method; Step 2; A third step of generating a second random number and generating a second image group by randomly changing the order of the lower images of the first image group according to the second random number; A fourth step of rearranging and rearranging sub-images of the second image group and storing restoration information for displaying the sub-images as the target image; And a fifth step of sequentially transmitting the sub images of the second image group to the client and transmitting the restoration information to the client if the image request is legitimate.

In the second step, the target image is not divided according to a predetermined order, but may be randomly determined according to the first random number.

The image copy prevention method in the web server may further include a sixth step of inserting the client user's connection information into the target image as a watermark and visually displaying the client image together with the target image in the client.

The image copy prevention method in the web server may further include a seventh step of providing a graphic user interface (GUI) for performing a captcha test on the target image displayed on the client.

The image copy prevention method in the web server includes generating a third random number group including a random number as many as the number of sub images included in the first image group, To the identification information of the sub-image included in the sub-image. In this case, the identification information allocated to the lower image of the first image group may be kept the same even if the order of the lower images of the first image group is changed according to the third step.

The shape of the sub image of the first image group may be predetermined in a specific shape, may be randomly selected among a plurality of previously stored shapes, or may be determined by a combination of at least two shapes among a plurality of shapes previously stored And may be determined by a predetermined dividing pattern for dividing the target image into a plurality of sub images.

Wherein the size of the lower image of the first group of images is randomly selected so as to correspond to the first random number among a plurality of sizes stored in advance or a predetermined size with respect to the first random number, Can be the size produced.

The method for preventing image copying in the web server according to the present invention can provide an effect of preventing illegal copying of images by allowing the user to be alerted by inserting the client user's connection information into the image as a watermark.

A method for preventing image copying in a web server according to the present invention includes generating random numbers to divide an image into a plurality of sub images, randomly rearranging a plurality of sub images in order to generate another random number, It is possible to provide an effect of preventing image duplication by making it difficult for a client who attempts to duplicate illegal images to recombine images.

In addition, the image copy prevention method in the web server according to the present invention can provide an effect of preventing illegal and mechanically automatic duplication of an image by providing a capcha interface on an image displayed on a client.

1 is a flowchart illustrating a method for preventing image copying in a web server according to the present invention.
FIG. 2 is a conceptual diagram illustrating a process of performing an image copy prevention method in the web server shown in FIG. 1. FIG.
FIG. 3A shows that the user access information is embedded in the target image as a watermark in the target image according to the image copy prevention method in the web server shown in FIG.
FIG. 3B shows a source code of a Web server for inserting user connection information into a target image as a watermark, as shown in FIG. 3A.
4A shows an example in which the target image is divided into four according to the image copy prevention method in the web server shown in FIG.
4B shows an HTML code in which the target image is divided into four parts as shown in FIG. 4A.
4C is a comparative example showing that the target image is not divided but entirely selected, unlike the image copy prevention method in the web server according to the present invention.
FIG. 5 shows various examples of the shape of sub images of a divided first image group of a target image according to the image copy prevention method in the web server shown in FIG.
FIG. 6A shows an example in which the order of the target images in the 4-split according to the image copy prevention method in the web server shown in FIG. 1 is changed.
FIG. 6B shows HTML source code indicating that the order of the four-divided target images is changed and transmitted as shown in FIG. 6A.
FIG. 7 shows an example of a capcha GUI displayed on a target image according to a method of preventing image copying in a web server according to the present invention.

For a better understanding of the present invention, its operational advantages and features, and the objects attained by the practice of the present invention, reference should be made to the accompanying drawings, which form a preferred embodiment of the invention, and the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a flowchart illustrating a method for preventing image copying in a web server according to the present invention. FIG. 2 is a conceptual diagram illustrating a process of performing an image copy prevention method in the web server shown in FIG. 1. FIG.

First, when the user 100 accesses the web server 300 using the browser of the client 200 and requests an image, the web server 300 receives an image request from the client 200, It is determined whether the request is legitimate (S100). The client 200 may be a fixed device such as a PC or a workstation, or a mobile device such as a smart phone or a notebook computer.

The image request may be determined to be illegal if it is performed by a web crawling tool, and may be determined to be legitimate if it is performed by a legitimate user. For example, in the case of downloading an image of a quantity larger than a human readable amount within a predetermined time, simultaneous downloading of a plurality of images, or failing to pass the capsule test, the image request is judged to be illegal by the web crawling tool .

More specifically, it takes generally several minutes for a person to read an image of a webtoon that has at least several dozen cuts. If a client wants to download an image corresponding to a plurality of webtoot times within a few seconds, it is judged to be an illegal image request . If the image request is determined to be illegal, the web server 300 can stop the image transmission to the client 200. [ Meanwhile, in the embodiment of FIG. 1, the web server 300 determines whether an image request is illegal by receiving an image request. Alternatively, the web server 300 may determine whether an image request is illegal at another step, The image transmission to the client 200 can be stopped by determining whether the image is illegal or not.

If it is determined that the image request is legitimate (YES in S110), the web server 300 loads the target image and inserts the connection information of the client 200 user 100 as a watermark in the target image (S120 ). Then, the user 100 is aware that his / her access information is displayed on the target image, and that he / she should not do image piracy, so image piracy can be prevented. In Fig. 2, the target image is briefly conceptually displayed as a landscape image including an obstacle and a moon, and the watermark is conceptually expressed as an asterisk.

After the watermark is inserted into the target image, the web server 300 generates a first random number and outputs the target image to the first image group 310 including the sub-images having a size randomly determined according to the first random number In accordance with a predetermined order (S130). In the present invention, instead of dividing the target image into a predetermined size, the web server 300 generates a random number and divides the target image into different sizes each time, , It is not possible to combine the target images with the simple processing that assumes the same sub-image size, so image piracy by the web crawling tool can be prevented in the first place.

In the example of Fig. 2, the target image is divided into four rectangular shaped sub-images SI-1 to SI-4 from top to bottom and left to right (i.e., in a predetermined order). However, in the present invention, the shape of the sub-image is not limited to a rectangle, and the size of the sub-image may be set differently each time. This portion will be described in more detail with reference to Figs. 4A to 5 in the following.

After the target image is divided into the first image group, the web server 300 generates a second random number, randomly changes the order of the sub images of the first image group according to the second random number, (S140), restoration information for rearranging and rearranging the sub images of the second image group to be displayed as the target image is stored (S150), and the sub images of the second image group are sequentially And transmits the restoration information to the client if the image request is legitimate (S160). The reconstruction information may include the size of the sub-images divided by the random number in step S130 and the order of the sub-images changed in step S140.

At this time, various information for restoring the target image in the client 200 including the restoration information may be obfuscated and transmitted to the client 200. Then, the client 200 can not analyze the processing logic, analyze the processing process, analyze the processing steps, and can not modify the corresponding information, so that the image copying prevention effect by the web crawling tool can be further enhanced.

In the example of FIG. 2, the order of the sub images SI-1 to SI-4 of the first image group is randomly set to SI-4, SI-2, SI-1, And is transmitted. In the present invention, since the sub images are randomly changed in random order and transmitted, when the client 200 combines the sub images according to the received order, the target image can not be completed. Therefore, The image piracy by the user can be prevented secondarily. This portion will be described in more detail with reference to Figs. 6A to 6B.

Then, the client 200 sequentially receives the changed sub-images, then rearranges the sub-images based on the received reconstruction information, and reassembles the sub-images in consideration of the size of the sub-images, Can be provided through the screen of FIG.

Meanwhile, the web server 300 may provide a graphic user interface (GUI) for performing a captcha test on the target image displayed on the client 200. If the web server 300 does not pass the test through the GUI, the web server 300 can eliminate a plurality of target images. On the other hand, the web crawling tool has a function of displaying the page as if it is directly rendered in the web browser and capturing the entire page, which may prevent the entire screen from being captured by the web crawling tool.

Hereinafter, a concrete procedure of actually performing the image copy prevention method in the web server according to the present invention will be described in detail with reference to various drawings.

FIG. 3A shows that the user access information is embedded in the target image as a watermark in the target image according to the image copy prevention method in the Web server 300 shown in FIG. FIG. 3B shows a Web server source code for inserting user connection information into a target image as a watermark, as shown in FIG. 3A.

Referring to FIG. 3A, it can be seen that a watermark 'copy protected' including the user's access information is inserted and displayed in a portrait of a woman, which is a target image. At this time, it can be seen that the access information includes the user's name 'Lee Sung-hoon' and the access time of the user's web server 300 '2018-06-08 PM 4:33:21 PM'. The access information may be extracted from the information transmitted from the client 200 by the Web server 300. On the other hand, the access information of the user inserted into the watermark in the target image is not limited to the example shown in Fig. 3A.

Referring to FIG. 3B, in a dotted line box of a web server source code for inserting such a watermark, a code string 'drawText (image1, "copy protected (" + userName + DateTime. Now.ToString () + ")"); '.

4A shows an example in which the target image is divided into four according to the image copy prevention method in the web server 300 shown in FIG. 4B shows an HTML source code in which the target image is divided into four parts as shown in FIG. 4A. 4C is a comparative example showing that, unlike the image copy prevention method in the web server 300 according to the present invention, the target image is not divided but the entire image is selected.

Referring to FIG. 4A, it can be seen that based on the first random number, the target image is divided into a first group of images including four sub-images SI-1 to SI-4. Target image segmentation consists of a predetermined segmentation order, top to bottom and left to right, i.e., zigzag. Meanwhile, the target image dividing order in the present invention is not limited to the above example. For example, in another embodiment of the present invention, the subject image may be from bottom to top or from right to left.

In FIG. 4A, the upper left first sub-image SI-1 of the sub-images SI-1 to SI-4 is selected by dragging to overlay the first sub-image SI- Which means that each of the sub-images SI-1 to SI-4 can be independently selected. However, in the comparative example of FIG. 4C, it can be seen that the entire object image is selected by dragging.

Referring to FIG. 4B, identification information (id) '639, 942, 1746 and 1752' is assigned to each of the lower images SI-1 to SI-4 of the first image group in which the target image is divided. This is because the web server 300 generates a random number group as many as the number of the lower images SI-1 to SI-4 and assigns it to the identification information of the lower images SI-1 to SI-4 have. Since the identification information of the sub images SI-1 to SI-4 is also given by the generated random number, it is difficult to know the regularity of the identification information in the client 200, It is effective in preventing image copying.

FIG. 5 shows various examples of the shape of sub images of a divided first image group of a target image according to the image copy prevention method in the web server shown in FIG. For reference, the shape of the sub images in the present invention is not limited to the examples shown in FIG.

Figures 5 (a) and 5 (b) show that the target image is divided into a plurality of square-shaped sub-images. At this time, the shape of the sub-images may be predetermined as a square, and the shape of the sub-images may be randomly selected from a plurality of predetermined shapes. On the other hand, the shape of the sub-image may be selected randomly among the plurality of shapes based on the first random number for image segmentation.

The size of the sub images may be determined in advance by a predetermined size, a plurality of types of sizes may be stored, a random number may be randomly selected to correspond to a first random number for image division, And may be a size randomly generated by the first random number. This can be equally applied to other examples to be discussed in the future.

5 (c) shows that the target image is divided into a structure in which the square shape and the rectangular shape are repeated. At this time, the square and the rectangular shape of the sub images may be randomly selected from a plurality of previously stored shapes. In another embodiment of the present invention, a plurality of shapes of sub-images are defined, and two or more shapes are selected, and the shapes of the sub-images may be determined by their combination.

5D, the target image may be divided into sub-images while the square shape of FIG. 5A is divided into the right oblique direction. 5E shows that when the target image is divided into a rectangle of a specific size and then the remaining portion of the target image is smaller than the rectangle, the remaining target image is divided into rectangles of a size different from the rectangle .

FIG. 5 (f) shows that the target image is divided into a plurality of sub images according to a predetermined radial division pattern. The division order of the sub-images may be clockwise or counterclockwise starting from a specific sub-image, and may be randomly selected without special rules. The division order of the target image may be randomly selected based on the first random number. The feature that the target images are divided into sub-images in random order may be the same in the above-mentioned examples.

FIG. 6A shows an example in which the order of the target images in the 4-split according to the image copy prevention method in the web server shown in FIG. 1 is changed. FIG. 6B shows HTML source code indicating that the order of the four-divided target images is changed and transmitted as shown in FIG. 6A.

Referring to FIG. 6A, it can be seen that the order of the four sub-images in FIG. 4A is changed in the order of SI-4, SI-3, SI-2, and SI-1. As described above, the order of the sub images may be changed randomly according to the second random number generated by the web server 300. Accordingly, the client 200 can not receive the sub-images sequentially and restore the target image through the simple combination.

6B, the changed sub-images are sequentially transmitted to the client 200 according to the changed order. The identification information (id) of each sub-image may include a fourth sub-image (SI- 4) is 1752, the third sub-image SI-3 is 1746, the second sub-image SI-2 is 942, the first sub-image SI-1 is 638, It can be seen that the identity is maintained. Therefore, the client 200 can receive the identification information, which is identical to the changed order information of the lower image, and restore the target image.

FIG. 7 shows an example of a capcha GUI displayed on a target image according to a method of preventing image copying in a web server according to the present invention.

Referring to FIG. 7, it can be seen that a capcha GUI is displayed for clicking on a circle on a target image to select it. When the user clicks a circle in the GUI, the target image is continuously displayed on the client 200. However, in the case of the web crawling tool, such a Capsule test can not be performed, and the web server 300 displays the target The display of the image can be stopped. It is also possible to prevent the entire screen from being captured by the web crawling tool through the Capsule GUI.

In this specification, the actual execution process of the image copy prevention method in the web server according to the present invention has been exemplified as a target image of a small size for convenience of explanation. However, if applying the image copying method in the web server according to the present invention to a large image such as a webtoon image including at least a few dozen cuts, it will be more difficult to perform image copying using a web crawling tool.

According to the present invention as described above, the image copy prevention method in the web server according to the present invention can prevent the illegal copying of the image by allowing the user to be alerted by inserting the user's access information into the image as a watermark, It is possible to prevent image duplication by dividing the image into a plurality of sub images using a random number and transmitting the random images to the client by randomly shuffling the order, and it is possible to prevent image duplication by the web crawling tool through the capsule test.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: User 200: Client
300: Web server

Claims (10)

A web server comprising: a first step of receiving an image request from a client and loading a target image;
Wherein the web server generates a first random number and assigns the target image to a first image group including sub images having a size determined randomly according to the first random number, A second step of dividing;
A third step of the web server generating a second random number and generating a second image group by randomly changing the order of the lower images of the first image group according to the second random number;
A fourth step of the web server storing restoration information for rearranging and rearranging the sub images of the second image group and displaying the sub images of the second image group as the target image; And
Wherein the web server sequentially transmits the sub images of the second image group to the client and transmits the restoration information to the client.
The method according to claim 1,
Wherein, in the second step,
Wherein the first random number is randomly determined according to the first random number instead of being divided according to a predetermined order.
The method according to claim 1,
The image copy prevention method in the web server includes:
The web server further comprises a sixth step of visually displaying the client image together with the target image by inserting the client connection information of the client into the target image as a watermark, How to prevent image duplication.
The method according to claim 1,
The image copy prevention method in the web server includes:
Wherein the web server further comprises a seventh step of providing a graphic user interface (GUI) for performing a captcha test on the target image displayed on the client.
5. The method according to any one of claims 1 to 4,
The image copy prevention method in the web server includes:
Wherein the web server generates a third random number group including a random number as many as the number of the lower images included in the first image group and generates the third random number group randomly, To the identification information,
Wherein the identification information allocated to the lower image of the first image group is kept the same even when the order of the lower image of the first image group is changed according to the third step. Way.
5. The method according to any one of claims 1 to 4,
Wherein the shape of the sub-
A method for preventing image copying in a web server, the method comprising:
5. The method according to any one of claims 1 to 4,
Wherein the shape of the sub-
Wherein the image is randomly selected from a plurality of pre-stored shapes.
5. The method according to any one of claims 1 to 4,
Wherein the shape of the sub-
Wherein the image is determined by a combination of at least two or more shapes among a plurality of pre-stored shapes.
5. The method according to any one of claims 1 to 4,
Wherein the shape of the sub-
Wherein the image data is determined by a predetermined division pattern for dividing the target image into a plurality of sub images.
5. The method according to any one of claims 1 to 4,
The size of the sub-image of the first group of images may be,
Wherein the first random number is a size determined in advance for the first random number or randomly selected to correspond to the first random number among a plurality of sizes stored in advance or randomly generated in response to the first random number. How to prevent image copying in.

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