KR102615798B1 - Apparatus and method for preventing screen capture and mirroring using text field protection properties - Google Patents

Abstract

A screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention includes a protection property extraction module for extracting text field protection properties included in a first class, and a dependency for removing dependency of the text field protection properties. It includes a removal module and a dependency input module that provides dependency of the text field protection property on a second class, which is a UI that is copied when the screen copy function is performed.

Description

Apparatus and method for preventing screen capture and mirroring using text field protection properties}

The disclosed invention relates to a device and method for preventing screen capture and mirroring using text field protection properties. More specifically, it relates to a device and method for preventing screen capture and mirroring by applying a protection property to a graphic layer to allow the graphic layer to pass when copying the screen. It is an invention about technology.

Recently, media content, such as drawings by artists or webtoons published by cartoonists, is being provided to users for free or for a fee through applications on user terminals. These media contents are a type of copyrighted work and are valuable assets belonging to the author's intellectual property rights.

However, there are cases where some malicious users illegally leak and distribute these works through screen capture or mirroring. Screen capture and mirroring are functions that copy the screen displayed on the user's terminal, and because they are performed through a personal terminal, there is a problem in that the author cannot be aware of the user's illegal copying.

In addition, in the case of the Android system, there is a function that can block the capture or mirroring of copyrighted works within the system itself, but in the case of the IOS system, in order for the application to be given the function to block capture, it must go through a complicated process of adding a content encryption and decryption server. , or there is only a function that handles only the steps after screen copying is completed.

Additionally, these functions can block screen capture and mirroring for streaming services such as videos, but have the disadvantage of not blocking screen capture and mirroring for static image works such as webtoons.

Therefore, in the case of IOS systems that prioritize user privacy and security, there are difficulties in applying functions that limit interaction between installed applications and prohibit capture in specific applications, preventing illegal screen capture and mirroring of copyrighted works from the source. There are problems that are difficult to prevent.

(Patent Document 0001) Republic of Korea Patent No. 10-1974618 (Method for blocking screen capture, application and user terminal for performing the method)

Therefore, the screen capture and mirroring prevention device and method using the text field protection attribute according to one embodiment is an invention created to solve the problem described above, and when the user copies the screen, the specific graphic layer requiring protection is passed and the sub-graphics are passed. The purpose is to provide a device and method for preventing screen capture and mirroring by allowing layers to be copied.

More specifically, the purpose is to provide a device and method to prevent illegal screen capture and mirroring by malicious users by extracting text field protection properties that exist in a specific class and applying them to a specific graphic layer that requires protection. .

A screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention includes a protection property extraction module for extracting text field protection properties included in a first class, and a dependency for removing dependency of the text field protection properties. It may include a removal module and a dependency input module that grants dependency of the text field protection property to a second class that is a UI that is copied when the screen copy function is performed.

The second class includes a graphic layer displayed on the screen of the user terminal, and the dependency input module can apply the text field protection attribute to the graphic layer.

When a screen copy function is performed on the user terminal, based on the text field protection attribute applied to the graphic layer by the dependency input module, the graphic layer may be passed and a lower graphic layer of the graphic layer may be copied.

The dependency removal module can rewrite the text field protection properties as properties of the top class.

The first class may be UITextField, which provides functions related to text input.

A screen capture and mirroring prevention method using text field protection properties according to an embodiment of the disclosed invention includes a protection property extraction step of extracting text field protection properties included in a first class, and a dependency of removing the dependency of the text field protection properties. It may include a removal step and a dependency input step of assigning dependency of the text field protection property to the second class, which is a UI that is copied when the screen copy function is performed.

The dependency granting step may include applying the text field protection attribute to a graphic layer displayed on the screen of the user terminal included in the second class.

An apparatus and method for preventing screen capture and mirroring using a text field protection property according to an embodiment maintains the quality of the graphic layer provided to the user terminal, but separately sets the graphic layer actually copied in the screen copy step to capture and capture the screen. There is an advantage to preventing mirroring.

An apparatus and method for preventing screen capture and mirroring using text field protection properties according to an embodiment can protect copyrighted works regardless of the performance of the capture function of the operating system itself, thereby preventing screen copying of copyrighted works by itself in a more simplified manner. There are advantages that can be achieved.

Figure 1 is a diagram showing the main configuration of a screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention.
FIG. 2 is a diagram illustrating a generally performed screen capture process in a screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention.
Figure 3 is a flowchart illustrating a screen capture and mirroring prevention method using text field protection properties according to an embodiment of the disclosed invention.
FIG. 4 is a diagram illustrating a screen copy process when screen capture and mirroring functions are performed in an apparatus and method for preventing screen capture and mirroring using text field protection properties according to an embodiment of the disclosed invention.
Figure 5 is a diagram showing the overall operation process of the API in the screen capture and mirroring prevention device and method using text field protection properties according to an embodiment of the disclosed invention.

The embodiments described in this specification and the configurations shown in the drawings are only preferred examples of the disclosed invention, and at the time of filing this application, there may be various modifications that can replace the embodiments and drawings in this specification.

In addition, the same reference numbers or symbols shown in each drawing of this specification indicate parts or components that perform substantially the same function.

Additionally, the terms used herein are used to describe embodiments and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. The existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not excluded in advance.

In addition, terms including ordinal numbers such as “first”, “second”, etc. used in this specification may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another.

For example, a first component may be named a second component, and similarly, the second component may also be named a first component without departing from the scope of the present invention. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a diagram showing the main configuration of a screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention.

Referring to FIG. 1, the screen capture and mirroring prevention device 100 using text field protection properties according to an embodiment may be implemented as a software program installed on a user terminal or a software programming interface (Application Programming Interface, API). .

Hereinafter, the screen capture and mirroring prevention device 100 using text field protection properties according to an embodiment will be abbreviated as the screen capture and mirroring prevention device 100.

The software in the present invention is mainly called a mobile application or app, and is installed and executed on a mobile phone operating system (OS), and can be implemented as conventional software that allows the user to perform various tasks and utilize the functions of the mobile phone. You can.

Additionally, the software programming interface in the present invention is an interface for exchanging data between programs and interacting with software applications, and provides functions and tools necessary for building applications.

Accordingly, the user terminal on which the screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention is installed may correspond to a computing device that transmits and receives data using a network and can execute various software.

An operating system program for booting and driving may be stored in the user terminal. For example, operating system programs may include Android OS, iOS (iPhone OS), Tizen OS, BlackBerry OS, Windows Phone OS, etc.

Additionally, the user terminal may be implemented as several terminal devices including a control unit so that this algorithm can be realized, for example, it may be implemented as a PC, smart pad, or laptop.

In addition, user terminals include PDA (Personal Digital Assistant) terminals, Wibro (Wireless Broadband Internet) terminals, smartphones, tablet PCs, smart watches, smart glasses, and wearable devices. It can be implemented in all types of handheld-based wireless communication devices, such as the like.

The screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention is a technology specifically applied to the IOS operating system.

The screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention may include a screen copy prevention module 110 and a processor 120.

More specifically, the screen copy prevention module 110 may include a protection attribute extraction module 111, a dependency removal module 112, and a dependency input module 113.

Specifically, the screen copy prevention module 110 is controlled by the processor 120 and can prevent the application screen from being illegally copied using a specific UI as a parameter.

Additionally, the processor 120 may control the protection attribute extraction module 111, the dependency removal module 112, and the dependency input module 113, respectively.

For example, the processor 120 may perform overall control and processing related to extracting text field protection properties, removing dependency on the superclass of the properties, granting dependency on text field protection properties to the top class, etc.

In FIG. 1, the processor 120 and the screen copy prevention module 110 are shown and described as separate configurations, but the processor 120 and the screen copy prevention module 110 are integrated as a single processor 120. It can be.

The protection attribute extraction module 111 may retrieve the text field protection attribute included in the first class. More specifically, the first class may be the UITextField class that provides functions related to text input.

Specifically, the UITextField class is a user interface (UI) element used in app development for the IOS system and represents a text field that receives text. UITextField can provide various properties and methods to control behavior and properties related to the text field.

For example, a user can touch the UITextField class and use the keyboard to enter text on the user's terminal.

In particular, the UITextField class is a UI element that allows the user to edit text. For example, the UITextField class allows users to enter new text or modify existing text in a text field.

Additionally, the UITextField class can interact with the keyboard to allow the user to input text and provide text restriction features such as limiting the maximum length of text, restricting input to specific character types, and input formatting.

As such, the UITextField class is an element used in various user input scenarios and is an essential component for processing text input and interacting with the user in apps on the iOS system.

The text field protection attribute used in the screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention is one of various attributes of the UITextField class, and is an attribute used to safely display text entered into a text field.

More specifically, the text field protection attribute according to the disclosed invention may be the isSecureTextEntry attribute.

Specifically, the isSecureTextEntry property is a Boolean value that indicates whether the text object disables copying.

If the isSecureTextEntry property is set to true, text entered into the text field can be masked.

In other words, the entered text is displayed as characters such as dots or asterisks instead of being displayed on the screen of the user terminal.

Additionally, the isSecureTextEntry property is mainly used when sensitive information, such as entering a password, must be entered, which can enhance security on the screen.

Therefore, this isSecureTextEntry property has a dependency on the UITextField class.

Therefore, the screen capture and mirroring prevention device 100 and method according to the disclosed invention retrieve the isSecureTextEntry property that exists only in the UITextField class through the protection property extraction module 111, and then capture and capture illegal works based on this isSecureTextEntry property. Technology to prevent mirroring can be provided. Detailed information regarding this will be described later.

The dependency removal module 112 may remove the dependency of the text field protection attribute on the first class. More specifically, the dependency removal module 112 may remove the dependency of the isSecureTextEntry property on the UITextField class corresponding to the first class.

Specifically, in general software, removing dependencies can mean making one element of the software design not dependent on another element. Dependency can indicate that one element operates or interacts in dependence on another element.

Therefore, by removing dependencies between elements in the API, the flexibility, reusability, and testability of the software system can be improved.

Accordingly, removing the dependency of the isSecureTextEntry property on the UITextField class may mean that the isSecureTextEntry property is no longer dependent on the UITextField class.

Specifically, the dependency removal module 112 may remove the dependency of the isSecureTextEntry property so that the isSecureTextEntry property can be applied to all classes.

Afterwards, the dependency removal module 112 may rewrite the text field protection attribute from which the dependency has been removed as an attribute within the top class.

For example, the dependency removal module 112 may rewrite the isSecureTextEntry property, which is a text field protection property, as a property within the NSObject class, which is the highest class.

More specifically, the NSObject class is a class used as the base class for all classes in Objective-C and Swift languages. Additionally, NSObject belongs to the Foundation framework and is the parent class from which other classes basically inherit.

Additionally, the NSObject class defines many methods that provide basic functions and operations in object-oriented programming.

Therefore, since all classes inherit NSObject, the dependency removal module 112 rewrites the isSecureTextEntry property as a property within the NSObject class, the highest class, so that other classes can also use the functions and method properties of NSObject.

When the screen copy function is performed, the dependency input module 113 may grant dependency of the text field protection attribute to the second class, which is the object UI of the copy operation.

More specifically, the second class may include a graphic layer displayed on the screen of the user terminal. Specifically, the graphics layer may be a CA Layer.

Accordingly, when the screen copy function is performed, the dependency input module 113 may grant dependency of the isSecureTextEntry attribute, which is a text field protection attribute, to CA Layer, which is the second class.

This CA Layer is a core class of Core Animation and is an object that draws graphic content and processes animation. Additionally, CA Layer provides 2D graphics functions and can be used as a backup for UIView objects to draw and render content on the screen.

In addition, CA Layer contains various visual properties and can express various graphic elements. Additionally, CA Layer is mainly used in app development for IOS systems and is a useful element for processing various graphic tasks.

Therefore, the UI displayed on the screen through the CA Layer may be included in the copied object image when the screen capture function is performed on the user terminal.

However, the screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention applies the isSecureTextEntry attribute to the CA Layer, so that when performing a screen capture operation, the CA Layer to which the isSecureTextEntry attribute is applied is passed and the lower CA Layer is copied. By creating a , you can prevent unauthorized copying of a specific screen.

Below, we will explain the process in which a screen capture operation is generally performed on a user terminal.

FIG. 2 is a diagram illustrating a generally performed screen capture process in a screen capture and mirroring prevention device using text field protection properties according to an embodiment of the disclosed invention.

Referring to FIG. 2, when a user wants to perform a screen capture task on a user terminal, the user can input a capture command using a hardware button on the user terminal.

For example, in the case of IOS devices, users can generally activate the screen capture function by pressing the power button and the home button at the same time, or by pressing the power button and the volume up button at the same time.

However, the input method of the user's capture command is not limited to this, and screen capture can be performed programmatically through a separate API. In this case, screen capture can be performed using a software method, such as inputting a capture command through a gesture, rather than a hardware button input.

Thereafter, when the screen capture function is triggered by a hardware button input, the content displayed on the screen of the user terminal may be copied.

Specifically, in the screen copy step, the UI displayed on the screen may be copied. In this screen copy step, the system refers to the value of CA Layer, a graphic layer within the screen UI, and the CA Layer displayed on the screen can be copied.

When screen copying is complete, the copied screen image can be stored in memory. Users can save the saved images to the file system or transfer them to other applications or services.

Therefore, the screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention uses a specific attribute assigned to the CA Layer, ignores the CA Layer to which the text field protection attribute is applied in the screen copy step, and This is an invention that allows lower CA layers to be copied.

Accordingly, the disclosed invention can prevent illegal copying of content by implementing the API within the application itself without interfering with or interfering with the performance of the screen capture task of the user terminal. Therefore, the disclosed invention has a technical effect that can be easily applied and used without the constraints and component constraints of the existing IOS system.

Figure 3 is a flowchart illustrating a screen capture and mirroring prevention method using text field protection properties according to an embodiment of the disclosed invention.

Referring to FIG. 3, the screen capture and mirroring prevention method according to an embodiment of the disclosed invention may include a text protection attribute extraction step (S110).

More specifically, the text protection attribute extraction step (S110) of the disclosed invention may be a step of calling the text field protection attribute included in the first class.

Specifically, the first class may be the UITextField class that provides functions related to text input.

Specifically, the UITextField class is a user interface (UI) element used in app development for the IOS system and represents a text field that receives text. UITextField can provide various properties and methods to control behavior and properties related to the text field.

For example, a user can touch the UITextField class and use the keyboard to enter text on the user's terminal.

As described above, the UITextField class is an element used in various user input scenarios and is an essential component for processing text input and interacting with the user in apps on the iOS system.

In addition, the text field protection property used in the screen capture and anti-mirroring device 100 according to an embodiment of the disclosed invention is one of various properties of the UITextField class, and is a property used to safely display text entered in a text field. am.

More specifically, the text field protection attribute according to the disclosed invention may be the isSecureTextEntry attribute.

Specifically, the isSecureTextEntry property is mainly used when sensitive information must be entered, such as entering a password, to enhance on-screen security. Therefore, this isSecureTextEntry property has a dependency on the UITextField class.

Thereafter, the screen capture and mirroring prevention method according to an embodiment of the disclosed invention may include a dependency removal step of the text protection attribute (S120).

More specifically, the step of removing the dependency of the text protection attribute (S120) may be a step of removing the dependency of the text field protection attribute on the first class.

Specifically, the step of removing the dependency of the text protection property (S120) may be a step of removing the dependency of the isSecureTextEntry property on the UITextField class, which is the first class.

Removing the dependency of the isSecureTextEntry property on the UITextField class may mean that the isSecureTextEntry property is no longer dependent on the UITextField class.

Specifically, in the step of removing the dependency of the text protection attribute (S120), the disclosed invention can remove the dependency of the isSecureTextEntry attribute on the UITextField class so that the isSecureTextEntry attribute can be applied to all classes.

Thereafter, in the step of removing the dependency of the text protection attribute (S120), the text field protection attribute from which the dependency has been removed can be rewritten as an attribute within the top class.

For example, in the dependency removal step (S120) of the text protection attribute, the disclosed invention can rewrite the isSecureTextEntry attribute, which is a text field protection attribute, as an attribute within the NSObject class, which is the highest class.

As mentioned above, since all classes inherit NSObject, in the dependency removal step (S120) of the text protection property, the isSecureTextEntry property is rewritten as a property within the NSObject class, the highest class, and other classes also use the functions and methods of NSObject. Properties can now be used.

The screen capture and mirroring prevention method according to an embodiment of the disclosed invention may include a dependency input step (S130) of text protection properties.

The dependency input step (S130) of the text protection attribute may be a step of assigning dependency of the text field protection attribute to the second class, which is the object UI of the copy operation, when the screen copy function is performed.

More specifically, the second class may include a graphic layer displayed on the screen of the user terminal. Specifically, the graphics layer may be a CA Layer.

Accordingly, when the screen copy function is performed, the step of granting dependency of the text field protection property to the second class, which is the object UI of the copy operation, is performed on the graphic layer displayed on the screen of the user terminal included in the second class. Text field protection properties can be applied.

Therefore, in the dependency input step (S130) of the text protection attribute, the dependency of the isSecureTextEntry attribute, which is a text field protection attribute, can be granted to the second class, CA Layer.

As described above, the UI displayed on the screen through the CA Layer may be included in the copied object image when the screen capture function is performed on the user terminal.

However, the screen capture and mirroring prevention device 100 according to an embodiment of the disclosed invention applies the isSecureTextEntry attribute to the CA Layer, so that when performing a screen capture operation, the CA Layer to which the isSecureTextEntry attribute is applied is passed and the lower CA Layer is copied. , you can prevent unauthorized copying of specific screens.

The screen capture and mirroring prevention method according to an embodiment of the disclosed invention may include a step of creating a graphic layer to which a text protection attribute is applied (S140).

More specifically, the graphic layer creation step to which the text protection attribute is applied (S140) may be a CA Layer creation step to which the isSecureTextEntry attribute is applied.

Specifically, the disclosed invention receives the CA Layer that contains the copyrighted work and requires protection as a parameter, removes the dependency of isSecureTextEntry that exists only in UITextField, configures it in NSObject form, and receives isSecureTextEntry with the dependency removed as a parameter. You can apply it to the layer, create a secure CA Layer, and return it.

FIG. 4 is a diagram illustrating a screen copy process when screen capture and mirroring functions are performed in an apparatus and method for preventing screen capture and mirroring using text field protection properties according to an embodiment of the disclosed invention.

Referring to FIG. 4, when the screen capture and mirroring functions are performed on the user terminal, the CA Layer in the UI displayed on the screen may be copied.

At this time, according to the disclosed invention, the CA Layer to which the isSecureTextEntry attribute is applied is not copied based on the isSecureTextEntry unique attribute, but the lower CA Layer is copied.

Therefore, in the disclosed invention, even if a user performs a capture or mirroring operation on a work in an IOS system that does not provide an environment that can restrict the capture function, the work is displayed on the screen of the user terminal, but the work is not displayed when copying the screen. There is a technical effect that can fundamentally block unauthorized copying of digital content.

In addition, the disclosed invention uses the unique property of isSecureTextEntry to allow the lower CA Layer of the CA Layer containing the copyrighted work to be copied, thereby enabling application development without interfering with the system's unique capture operation or requiring a separate authentication procedure within the system. There is a technical effect that can prevent unauthorized copying of copyrighted works at this stage.

Figure 5 is a diagram showing the overall operation process of the API in the screen capture and mirroring prevention device and method using text field protection properties according to an embodiment of the disclosed invention.

Referring to FIG. 5, the disclosed invention allows the CA Layer containing the contents of works requiring protection to be input as a parameter to the API when developing an application.

Afterwards, inside the API that receives CA Layer as a parameter, the dependency of the isSecureTextEntry property, which exists only in UITextField, can be removed and configured in NSObject form.

More specifically, the disclosed invention removes the dependency of the isSecureTextEntry property on UITextField, and rewrites the isSecureTextEntry property from which the dependency has been removed as a method of NSObject, the highest class, so that it can be applied to all classes.

Afterwards, the disclosed invention can be applied to the CA Layer that receives the isSecureTextEntry attribute from which the dependency has been removed as a parameter.

Finally, the CA Layer to which the isSecureTextEntry property is applied can be returned. Accordingly, the returned CA Layer has properties that are passed when copying the screen based on the isSecureTextEntry property.

Therefore, according to the disclosed invention, there is a technical effect that can prevent screen capture and mirroring of a desired UI at a desired time during the app development stage and further prevent unauthorized copying and distribution of copyrighted work.

An apparatus and method for preventing screen capture and mirroring using text field protection properties according to an embodiment maintains the quality of the graphic layer provided to the user terminal, but separately sets the graphic layer actually copied in the screen copy step to capture and capture the screen. There is an advantage to preventing mirroring.

An apparatus and method for preventing screen capture and mirroring using text field protection properties according to an embodiment can protect copyrighted works regardless of the performance of the capture function of the operating system itself, thereby preventing screen copying of copyrighted works by itself in a more simplified manner. There are advantages that can be achieved.

The device described above may be implemented with hardware components, software components, and/or a combination of hardware components and software components.

For example, devices and components described in embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It may be implemented using one or more general-purpose or special-purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions.

A processing device may perform an operating system (OS) and one or more software applications that run on the operating system.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., singly or in combination.

Program instructions recorded on the medium may be specially designed and configured for the embodiment or may be known and available to those skilled in the art of computer software.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -Includes optical media (magneto-optical media) and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc.

Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

In the above, specific embodiments are shown and described. However, it is not limited to the above-described embodiments, and those skilled in the art can make various changes without departing from the gist of the technical idea of the invention as set forth in the claims below. .

100; Screen capture and anti-mirroring device
110; processor
111; Protected attribute extraction module
112; Dependency removal module
113; dependency input module
120; Memory

Claims (7)

a protected property extraction module that extracts text field protected properties included in the first class;
a dependency removal module that removes the dependency of the text field protection attribute; and
Includes a dependency input module that provides dependency of the text field protection property on the second class, which is the UI that is copied when the screen copy function is performed;
The second class includes a graphic layer displayed on the screen of the user terminal,
The text field protection property is the isSecureTextEntry property,
When the screen copy function is performed, the dependency input module grants dependency of the isSecureTextEntry attribute to the graphic layer,
The dependency removal module is characterized in that the text field protection attribute is rewritten as an attribute of the highest class,
Screen capture and mirroring prevention device using text field protection properties. delete According to paragraph 1,
When the screen copy function is performed on the user terminal,
Characterized in that, based on the text field protection attribute given to the graphics layer by the dependency input module, the graphics layer is passed and the lower graphics layer of the graphics layer is copied.
Screen capture and mirroring prevention device using text field protection properties. delete According to paragraph 1,
The first class is UITextField, which provides functions related to text input.
Screen capture and mirroring prevention device using text field protection properties. A protection property extraction step of extracting text field protection properties included in the first class;
a dependency removal step of removing the dependency of the text field protection attribute; and
Includes a dependency input step of granting dependency of the text field protection attribute to the second class, which is the UI copied when the screen copy function is performed;
The second class includes a graphic layer displayed on the screen of the user terminal,
The text field protection property is the isSecureTextEntry property,
The dependency removal step includes rewriting the text field protection attribute from which the dependency has been removed as an attribute within a top-level class,
Characterized in that the dependency input step includes the step of granting dependency of the isSecureTextEntry attribute to the graphic layer.
How to prevent screen capture and mirroring using text field protection properties. delete