Abstract:
An input apparatus capable of receiving an input is provided. The input apparatus includes a communicator configured to communicate with a first user terminal device and a second user terminal device, a processor, in response to a content being selected from the first user terminal device through the input apparatus and a first predetermined event occurring, configured to receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device and, in response to a second predetermined event occurring, configured to transmit the received information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. Accordingly, user convenience will grow due to the reinforcement of security and availability of conveniently transmitting data to an external device without using a separate external device.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority benefit under 35 U.S.C. §119 of Korean Patent Application No. 10-2015-0131406, filed on Sep. 17, 2015 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Field of the Invention 
         [0003]    Apparatuses and methods of exemplary embodiments relate to an input apparatus and a controlling method thereof, and more particularly, to an input apparatus capable of transmitting information required to transmit content stored in a user terminal device to an external device and a controlling method thereof. 
         [0004]    2. Description of the Related Art 
         [0005]    On the strength of advancement of electronic technology, various types of electronic appliances have been developed and supplied. Especially, various display devices such as a TV, a cell phone, a PC, a laptop, PDA, and the like, are used in most homes. Further, having been equipped with an input apparatus such as a pen when using the various types of electronic appliances makes a user to be able to input data more elaborately and comfortably. 
         [0006]    Conventionally, a wireless networking method or a wire networking method by using a storing device like a USB is used to transmit data to an external device. Although the wireless networking method may seem to be convenient, it has some problems that it is vulnerable to security, must be connected to a 3G or 4G network, Bluetooth, or a W-Fi network, requires a large sized component for performing networking, and consumes much power. 
         [0007]    Further, the wire networking method may have an advantage over security, but it requires a separate storing device, which is one of biggest weaknesses of the method. 
         [0008]    Accordingly, a need of reinforcing security and transmitting data to an external device without using a separate external device has come to the forefront. 
       SUMMARY 
       [0009]    An exemplary embodiment addresses at least the above need, and an aspect of the exemplary embodiment is to provide an input apparatus capable of transmitting information required to transmit content selected by an input apparatus to an external device and a controlling method thereof. 
         [0010]    The input apparatus capable of receiving an input according to an exemplary embodiment includes a communicator configured to communicate with the first user terminal device and the second user terminal device and a processor, in response to content being selected from the first user terminal device through the input apparatus and the first predetermined event occurring, configured to receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device and, in response to the second predetermined event occurring, configured to transmit the received information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0011]    The first predetermined event may include an event where a function of transmitting the selected content to an external device is performed in the first user terminal device through the input apparatus, and the second predetermined event may include an event where a function of receiving the selected content from an external device is performed in the second user terminal device through the input apparatus. 
         [0012]    The input apparatus capable of receiving an input according to an exemplary embodiment further includes a function key configured to receive a user manipulation, and the processor, in response to the function key being pressed upon the user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the first user terminal device, may transmit a control signal for displaying the first user interface on a screen of the first user terminal device to the first user terminal device and, in response to the function key being pressed upon the user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the second user terminal device, may transmit a control signal for displaying the second user interface on a screen of the second user terminal device to the second user terminal device. 
         [0013]    The first user interface may include a menu for transmitting the selected content to an external device in the first user terminal device, and the second user interface may include a menu for receiving the selected content from an external device in the second user terminal device. 
         [0014]    The processor, in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device and, in response to a menu for receiving the selected content from the external device being selected in the second user interface, may transmit the received information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0015]    The input apparatus capable of receiving an input according to an exemplary embodiment further include a storage, and the processor may store information about identifier information and an encryption key of the first user terminal device received from the first user terminal device at the storage. 
         [0016]    The encryption key may be used for encrypting identifier information of the second user terminal device. 
         [0017]    A system including the input apparatus capable of receiving an input, the first user terminal device, and the second user terminal device, in response to a content being selected from the first user terminal through the input apparatus and the first predetermined event occurring, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device and, in response to the second predetermined event occurring, may transmit the received information about the identifier information and the encryption key of the first terminal device to the second user terminal device, and the second user terminal device, based on the received encryption key, may encrypt identifier information of the second user terminal device and transmits the identifier information of the second user terminal device to the first user terminal device, and the first user terminal device may decrypt the received encrypted identifier information of the second user terminal device based on the encryption key and may transmit the selected content to the second user terminal device based on the encrypted identifier information of the second user terminal device. 
         [0018]    The first predetermined event may include an event where a function of transmitting the selected content to an external device is performed in the first user terminal device through the input apparatus, and the second predetermined event may include an event where a function of receiving the selected content from an external device is performed in the second user terminal device through the input apparatus. 
         [0019]    The first user terminal device, in response to a control signal being received while the input apparatus is located within a predetermined range of distance from a screen of the first user terminal device, may display the first user interface on a screen, and the second user terminal device, in response to a control signal being received while the input apparatus is located within a predetermined range of distance from a screen of the second user terminal device, may display the second user interface on a screen. 
         [0020]    The first user interface may include a menu for transmitting the selected content to an external device in the first user terminal device, and the second user interface may include a menu for receiving the selected content from an external device in the second user terminal device. 
         [0021]    The first user terminal device, in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may transmit information about identifier information and an encryption key of the first user terminal device to the input apparatus, and the second user terminal device, in response to a menu for receiving the selected content from an external device being selected in the second user interface, may receive the information about the identifier information and the encryption key of the first user terminal device from the input apparatus. 
         [0022]    The first user terminal device, in response to an input of a predetermined pattern is being detected on the screen of the first user terminal device through the input device, may create the encryption key. 
         [0023]    A controlling method of an input apparatus capable of receiving an input according to an exemplary of embodiment, in response to content being selected from the first user terminal through the input apparatus and the first predetermined event occurring, includes receiving information about identifier information and an encryption key of the first user terminal device from the first user terminal device and, in response to the second predetermined event occurring, transmitting the received information about the identifier information and the encryption key of the first terminal device to the second user terminal device. 
         [0024]    The first predetermined event may include an event where a function of transmitting the selected content to an external device is performed in the first user terminal device through the input apparatus, and the second predetermined event may include an event where a function of receiving the selected content from an external device is performed in the second user terminal device through the input apparatus. 
         [0025]    The controlling method of the input apparatus capable of receiving an input according to an exemplary of embodiment, in response to the function key equipped with the input apparatus being pressed upon user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the first user terminal device, may include transmitting a control signal for displaying the first user interface on a screen of the first user terminal device to the first user terminal device and, in response to the function key equipped with the input apparatus being pressed upon user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the second user terminal device, transmitting a control signal for displaying the second user interface on a screen of the second user terminal device to the second user terminal device. 
         [0026]    The first user interface may include a menu for transmitting the selected content to an external device in the first user terminal device, and the second user interface may include a menu for receiving the selected content from an external device in the second user terminal device. 
         [0027]    Receiving the information from the first user terminal device, in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device, and transmitting the information to the second user terminal device, in response to a menu for receiving the selected content from an external device being selected in the second user interface, may transmit the received information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0028]    The controlling method of the input apparatus capable of receiving an input according to an exemplary of embodiment may further include storing information about identifier information and an encryption key of the first user terminal device received from the first user terminal device. 
         [0029]    The encryption key may be used for encrypting the identifier information of the second user terminal device. 
         [0030]    According to various exemplary embodiments, user convenience may be increased since the exemplary embodiment reinforces security and conveniently transmits data to an external device without using a separate external storing device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0031]      FIG. 1  is a block diagram illustrating a configuration of the input apparatus according to an exemplary embodiment. 
           [0032]      FIG. 2  is a block diagram illustrating a configuration of the input apparatus according to an exemplary embodiment. 
           [0033]      FIG. 3A  is a view illustrating the input apparatus in a form of a pen according to an exemplary embodiment. 
           [0034]      FIG. 3B  is a view describing an operation principle of the input apparatus in a form of a pen according to an exemplary embodiment. 
           [0035]      FIG. 4  and  FIG. 5  are views illustrating the first user interface and the second user interface according to an exemplary embodiment. 
           [0036]      FIG. 6  is a block diagram illustrating a configuration of the input apparatus according to an exemplary embodiment. 
           [0037]      FIG. 7  is a block diagram illustrating a configuration of the system which includes the input apparatus, the first user terminal device, and the second user terminal device according to an exemplary embodiment. 
           [0038]      FIG. 8  is a timing chart describing an operation process of the system according to an exemplary embodiment. 
           [0039]      FIG. 9  is a view showing transmitting content according to an exemplary embodiment. 
           [0040]      FIG. 10  is a flow chart describing a controlling method of the input apparatus capable of receiving an input according to an exemplary embodiment. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0041]    Hereinafter, exemplary embodiments will be described in more detail with reference to the accompanying drawings. Further, in the following description, if the exemplary embodiments of features or elements with unnecessary detail would obscure the exemplary embodiments, the detailed description thereof will not be described in detail. Further, terms used in the following description are the terms defined after considering features of the exemplary embodiment, and therefore, the definition thereof shall be made based on the exemplary embodiment overall. 
         [0042]      FIG. 1  is a block diagram illustrating a configuration of the input apparatus according to an exemplary embodiment. 
         [0043]    With a reference to  FIG. 1 , an input apparatus  100  includes a communicator  110  and a processor  120 . The input apparatus  100  is an input apparatus capable of receiving an input, and it may perform an input function, for example, while a screen of a user terminal device is touched by the input apparatus  100  by being contacted therewith. The input apparatus  100  may be embodied in a form of a pen but not limited thereto and may be embodied in various forms of a device. A detailed description of an exemplary method of receiving an input by the input apparatus  100  will be disclosed thereinafter. 
         [0044]    When the first user terminal device does not include a feature like a panel capable of receiving an input by touch, the input may be received by transmitting and receiving a control signal between the input apparatus  100  and the first user terminal device. In other words, an input of the input apparatus  100  is not limited to the touch input but may include a case where the input is received by transmitting and receiving a control signal. 
         [0045]    Although the first user terminal device may receive an input by a touch input, it may receive an input by receiving a control signal, and therefore, the exemplary embodiment may be applied to the first user terminal device which is not equipped with a touch panel and a display. 
         [0046]    An example that the input apparatus  100  is embodied in a form of a pen is described. 
         [0047]    The communicator  110  may communicate with the first user terminal device and the second user terminal device. The communicator  110  may communicate with an external device according to various types of communication methods. The communicator  110  may communicate with the first user terminal device and the second user terminal device through various communication methods such as Bluetooth (BT), Wireless Fidelity (W-Fi), Zigbee, Infrared (IR), Serial Interface, Universal Serial Bus (USB), Neal Field Communication (NFC), and the like. 
         [0048]    The first user terminal device and the second user terminal device may be embodied in various forms of electronic devices such as a TV, an electronic bulletin board, a Large Format Display (LFD), a smart phone, a tablet, a desktop PC, a laptop, an Electrophoretic Display (EPD), E-PAPER, and the like, may include a touch panel capable of receiving an input, and may be embodied in a form which is not equipped with a touch panel or a display. 
         [0049]    The processor  120 , in response to content being selected from the first user terminal device through the input apparatus and the first predetermined event occurring, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device. 
         [0050]    The processor  120 , in response to content displayed on a screen of the first user terminal device being selected while a part of the input apparatus  100  is contacted with the screen of the first user terminal device and the first predetermined event occurring, may receive information about identifier information and an encryption key of the first user terminal device through the communicator  110  from the first user terminal device. 
         [0051]    A method of selecting a content displayed on the screen of the first user terminal device while the input apparatus  100  is contacted with the screen of the first user terminal device may include at least one of the method that selects content displayed on the screen of the first user terminal device in a way of dragging the content while a part of input apparatus  100  is contacted with the screen of the first user terminal device, that selects a content displayed on the screen of the first user terminal device through one momentary contact of a part of the input apparatus  100  with the screen of the first user terminal, in other words, a single input, and that selects content displayed on the screen of the first user terminal device in a way that a part of the input apparatus  100  transmits a predetermined control signal within a predetermined range of distance from the screen of the first user terminal device. 
         [0052]    In a case where the first user terminal device does not include a touch panel or a display which includes a touch detection area capable of detecting a contact with the input apparatus  100 , content may be selected from the first user terminal device by transmitting and receiving a control signal between the input apparatus  100  and the first user terminal device. 
         [0053]    The input apparatus  100  may be embodied in a form of a pen, but a part of the input apparatus  100  that contacts with a screen of the first user terminal device may be embodied in a pen-tip. In other words, the pen-tip may be defined as a part which directly contacts with the screen of the first user terminal device and draws a line. 
         [0054]    The processor  120 , in response to the first predetermined event occurring, may receive information about identifier information and an encryption key of the fist user terminal device. The identifier information of the first user terminal device may be embodied in Mac address, and the encryption key may be an encryption key that is used only during one communication session between those in communication, and the encryption key may be used to encrypt the identifier information of the second user terminal device which will be described in detail thereinafter. 
         [0055]    The foregoing description is based on an example of a case where the processor  120  receives information of identifier information and an encryption key of the first user terminal device from the first user terminal device, but the processor  120  may not only receive the information about the identifier information and encryption key of the first user terminal device from the first user terminal device but also receive information about the storage location of the selected content and transmit it to the second user terminal device. 
         [0056]    The information about the storage location of the selected content may indicate a link address of the selected content and may include information about the location in which the selected content is located within the first user terminal device. 
         [0057]    In other words, the processor  120 , in response to the first predetermined event occurring, may receive the information about the storage location of the selected content from the first user terminal device rather than the selected content per se. 
         [0058]    The processor  120 , in response to the second predetermined event occurring, may transmit information about identifier information and an encryption key of the first user terminal device received from the first user terminal device to the second user terminal device. 
         [0059]    The processor  120 , in response to the second predetermined event occurring, may transmit the information about the identifier information and the encryption key of the first user terminal device stored in the storage (not illustrated) to the second user terminal device through the communicator  110 . 
         [0060]    The identifier information of the first user terminal device may be embodied in a Mac address, and the encryption key may be an encryption key that is used only during one communication session between those in communication, and the encryption key may be used to encrypt identifier information of the second user terminal device. 
         [0061]    The processor  120 , in response to the second predetermined event occurring, may transmit only information about identifier information and an encryption key of the first user terminal device but may also transmit the storage information of the selected content along with the information, and the storage information of the selected content may be a link address of the selected content, and the first user terminal device may include information about the location in which the selected content is located within the first user terminal device. 
         [0062]    The first predetermined event may include an event where a function of transmitting the selected content to an external device is performed in the first user terminal device through the input apparatus, and the second predetermined event may include an event where a function of receiving the selected content from an external device is performed in the second user terminal device through the input apparatus. 
         [0063]    The first predetermined event may include a case where a function of transmitting content to an external device is performed in the first user terminal device through the input apparatus  100 . For example, the first determined event may include a case where a function of transmitting content is selected in response to an input being received through the input apparatus  100  while a menu of a plurality of functions is being displayed on a screen of the first user terminal device. 
         [0064]    The second predetermined event, through an input by the input apparatus  100  in the second user terminal device, may include a function of receiving content from an external device is performed. For example, the second predetermined event may include a case where a function of receiving content is selected in response to an input being received through the input apparatus  100  while a menu of a plurality of functions is being displayed on a screen of the second user terminal device. 
         [0065]    In other words, when a pen-tip of the input apparatus  100  selects content on a screen of the first user terminal device and selects a function of transmitting the content on the screen of the first user terminal device, the processor  120  may receive information about identifier information and an encryption key of the first user terminal device form the first user terminal device, and then, when the pen-tip of the input apparatus  100  selects a function of receiving content on a screen of the second user terminal device through input, the processor  120  may transmit the information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0066]      FIG. 2  is a block diagram illustrating a configuration of the input apparatus according to another exemplary embodiment. 
         [0067]    Referring to  FIG. 2 , the input apparatus  100  may include a communicator  110 , a processor  120 , and a function key  130 . Detailed description of the communicator  110  and the processor  120  are as set forth above. 
         [0068]    The function key  130  may receive an input upon a user manipulation. For example, the function key  130  may be embodied in a function key with a touch sensor capable of recognizing user&#39;s touch, a physical key that can be pressed upon user manipulation, or a function key capable of fingerprint verification. 
         [0069]    The processor  120 , in response to the function key being pressed upon user manipulation while the input apparatus  100  is located within a predetermined range of distance from a screen of the first user terminal device, may transmit a control signal for displaying the first user interface on the screen of the first user terminal device to the first user terminal device and, in response to the function key being pressed upon the user manipulation while the input apparatus  100  is located within a predetermined range of distance from a screen of the second user terminal device, may transmit a control signal for displaying the second user interface on the screen of the second user terminal device to the second user terminal device. 
         [0070]    For example, the processor  120 , in response to the function key  130  being pressed while a pen-tip of the input apparatus  100  is located upward and within a predetermined range of distance from the screen of the first user terminal device, may transmit a control signal for displaying the first user interface on the screen of the first user terminal device, and accordingly, the first user terminal device may display the first user interface on the screen. 
         [0071]    The processor  120 , in response to the function key  130  being pressed while a pen-tip of the input apparatus  100  is located upward and within a predetermined range of distance from a screen of the second user terminal device, may transmit a control signal for displaying the second user interface on the screen of the second user terminal device, and accordingly, the second user terminal device may display the first user interface on the screen. 
         [0072]    A process of displaying the first user interface and the second user interface is described hereinafter with reference to  FIG. 3A  to  FIG. 5  while a method that the input apparatus in a form of a pen inputs on the screen of the user terminal device. 
         [0073]      FIG. 3A  is a view illustrating the input apparatus in a form of a pen according to an exemplary embodiment. 
         [0074]    Referring to  FIG. 3A , the input apparatus  100  is embodied in a form of a pen, and the first area of the pen includes the communicator  110  and the processor  120 , and the second area of the pen is equipped with the function key  130 , and the pen-tip may be defined as the part stuck out of the bottom end of the pen. 
         [0075]    The communicator  110  and the processor  120  may be embodied as hardware in a Bluetooth Low Energy (BLE) circuit, and the BLE circuit may perform functions of communication and interfacing between a pen and a user terminal device, and although it is not illustrated in the drawing, it may further include a storage (not illustrated), which is configured to store information about identifier information and an encryption key of a user terminal device. 
         [0076]    The function key  130 , in  FIG. 3A , is embodied in a form of a physical button that may be pressed upon user manipulation, and accordingly, when a user presses the function key  130  while the input apparatus  100  is located within a predetermined range of distance from a screen of a user terminal device, the processor  120  transmits a control signal to the user terminal device to display a user interface on the screen of the user terminal device. 
         [0077]    The input apparatus  100  in a form of a pen illustrated in  FIG. 3A  is a mere example and may c be embodied in various forms of input apparatus. 
         [0078]      FIG. 3B  is a view illustrating an operation principle of the input apparatus in a form of a pen according to an exemplary embodiment. 
         [0079]    Referring to  FIG. 3B , the pen-tip  30  of the input apparatus  100  includes a resonance circuit, and the sensor board  10  of the user terminal device includes a window, a display, and a Flexible PCB (FPCB). 
         [0080]    When the electric current is supplied to the sensor board  10 , FPCB generates the EM field  20 , and energy is delivered to the resonance circuit included in the pen-tip  30  of the input apparatus  100  through the generated EM field  20 . 
         [0081]    When the electric current supplied to the sensor board  10  is blocked, an induced current measuring instrument connected to the sensor board may measure the induced current arisen from resonance remained in the resonance circuit of the pen-tip  30  of the input apparatus  100  and accordingly, by scanning for each location on the sensor board window, may determine the location of the input apparatus  100  based on signal strength differences arisen from the induced current. 
         [0082]      FIG. 4  and  FIG. 5  are views illustrating a first user interface and a second user interface according to an exemplary embodiment. 
         [0083]    The first user interface may include a menu for transmitting the selected content to an external device in the first user terminal device, and the second user interface may include a menu for receiving the selected content from an external device in the second user terminal device. 
         [0084]    Referring to  FIG. 4 , the first user interface  400  may be displayed on a screen of the first user terminal device, and when a control signal is transmitted to the first user terminal device in response to the function key being pressed upon user manipulation while the input apparatus  100  is located within a predetermined range of distance from the screen of the first user terminal device, the first user interface  400  may be displayed on the screen of the first user terminal device. 
         [0085]    The first user interface  400  may include a menu for performing various functions such as pen inputting, editing, copying, searching, and the like, and may include a menu  410  for performing a function to transmit the selected content to an external device. 
         [0086]    Referring to  FIG. 5 , the second user interface  500  may be displayed on the screen of the second user terminal device, and as described above, when a control signal is transmitted to the second user terminal device in respond to the function key being pressed upon user manipulation while the input apparatus  100  is located within a predetermined range of distance from the screen of the second user terminal device, the second user interface  500  may be displayed on the screen of the first user terminal device. 
         [0087]    The second user interface  500  may include a menu for performing various functions such as pen inputting, editing, copying, searching, and the like, and may include a menu  510  for performing a function to receive the selected content to an external device. 
         [0088]    The first user interface  400  and the second user interface  500  illustrated in the  FIGS. 4 and 5  are merely examples and may be embodied in various forms of a user interface. 
         [0089]    The processor  120 , in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device, and in response to a menu for receiving the selected content from an external device being selected in the second user interface, may transmit the received information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0090]    For example, the processor  120 , in response to a menu  410  for performing a function of transmitting the selected content to an external device being selected in the first user interface  400  through the input apparatus  100 , may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device. 
         [0091]    The processor  120 , in response to a menu  510  for performing a function of receiving the selected content from an external device being selected in the second user interface  500  through the input apparatus  100 , may transmit information about identifier information and an encryption key of the first user terminal device to the second user terminal device. 
         [0092]      FIG. 6  is a block diagram illustrating a configuration of the input apparatus according to another exemplary embodiment. 
         [0093]    Referring to  FIG. 6 , the input apparatus  100  may include the communicator  110 , the processor  120 , the function key  130 , and the storage  140 . Detailed descriptions of the communicator  100 , the processor  120 , and the function key  130  are provided above. 
         [0094]    The storage  140  may include a ROM (not illustrated), a RAM (not illustrated), and the like, and a set of commands for system rebooting may be stored in the ROM (not illustrated), and various kinds of application programs may be copied into the RAM (not illustrated). 
         [0095]    The processor  120  may store the information about the identifier information and the encryption key of the first user terminal device received from the first user terminal device in the storage  140 . 
         [0096]    In other words, while the processor  120  stores the information about the identifier information and the encryption key of the first user terminal device received from the first user terminal device in the storage  140 , and the input apparatus  100  is located on the screen of the second user terminal device, in response to the second predetermined event occurring, the processor  120  may transmit the information about the identifier information and the encryption key of the first user terminal device to the second user terminal device. 
         [0097]    The encryption key may be used to encrypt the identifier information of the second user terminal device, and in this regard, a system that includes the first user terminal device, the second user terminal device, and input apparatus  100  will be described hereinafter. 
         [0098]      FIG. 7  is a block diagram illustrating a configuration of the system which includes the input apparatus, the first user terminal device, and the second user terminal device according to an exemplary embodiment. 
         [0099]    Referring to  FIG. 7 , the system  700  may include the input apparatus  100 , the first user terminal device  200 , and the second user terminal device  300 . 
         [0100]    The input apparatus  100  is an input apparatus capable of receiving an input, and the input apparatus, in response to a content being selected in the first user terminal device  200  through the input apparatus and the first predetermined event occurring, may receive information about identifier information and an encryption key of the first user terminal device  200  from the first user terminal device  200 , and, in response to the second predetermined event occurring, may transmit the received information about the identifier information and the encryption key of the first user terminal device  200  to the second user terminal device  300 . 
         [0101]    The second user terminal device  300 , based on the received encryption key, may encrypt the identifier information of the second user terminal device  300  and may transmit the identifier information of the second user terminal device  300  to the first user terminal device  200 . 
         [0102]    The second user terminal device  300 , in response to the information being received about the identifier information and the encryption key of the first user terminal device  200 , may encrypt the identifier information of the second user terminal device  300  based on the received encryption key and may transmit the encrypted identifier information of the second user terminal device  300  to the first user terminal device  200 . 
         [0103]    The second user terminal device  300  may directly transmit the encrypted identifier information of the second user terminal device  300  but also may transmit in a form of a broad casting. 
         [0104]    The second user terminal device  300 , may transmit not only the encrypted identifier information of the second user terminal device  300  but also the identifier information of the first user terminal device  200 , and here, when transmitting in a form of broad casting, the first user terminal device  200  may determine whether the information transmitted thereto is correct based on the encrypted identifier information of the second user terminal device  300  and the identifier information of the first user terminal device  200 . 
         [0105]    The first terminal device  200  may decrypt the encrypted identifier information of the second user terminal device based on the encryption key, and may transmit the selected content to the second user terminal device based on the decrypted identifier information of the second user terminal device. 
         [0106]    In other words, the first user terminal device  200  may receive identifier information of the first user terminal device  200  and the encrypted identifier information of the second user terminal device  300  from the second user terminal device  300  and, after checking whether the information is received properly by checking the identifier information of the first user terminal device  200 , may decrypt the identifier information of the second user terminal device  300  based on the encryption key. 
         [0107]    Further, the first user terminal device  200  may communicate with the second user terminal device  300  based on the encrypted identifier information of the second user terminal device  300 . 
         [0108]    Upon the first user terminal device  200  and the second user terminal device  300  being connected, the first user terminal device  200  may transmit the selected content to the second user terminal device  300  based on information about the storage location of the selected content. 
         [0109]    The first predetermined event may include an event where a function of transmitting the selected content to an external device is performed in the first user terminal device  200  through an input, and the second predetermined event may include an event where a function of receiving the selected content from an external device is performed in the second user terminal device  300  through an input. 
         [0110]    The first predetermined event may include an event where a function of transmitting content to an external device is performed on a screen of the first user terminal device  200  through input apparatus  100 . For example, the first predetermined event may include an event where the input apparatus  100  receives an input and a function of transmitting content is selected while a menu with a plurality of functions are displayed on the screen of the first user terminal device  200 . 
         [0111]    The second predetermined event may include an event where a function of receiving content from an external device is performed on a screen of the second user terminal device  300  through input apparatus  100 . For example, the second predetermined event may include an event where the input apparatus  100  receives an input and a function of receiving content is selected while a menu with a plurality of functions are displayed on the screen of the second user terminal device  300 . 
         [0112]    The first user terminal device  200 , in response to a control signal being received while the input apparatus  100  is located within the predetermined range of distance from the first user terminal device  200 , may display the first user interface on a screen, and the second user terminal device  300 , in response to a control signal being received while the input apparatus  100  is located within the predetermined range of distance from the second user terminal device  300 , may display the second user interface on a screen. 
         [0113]    The first user interface may include a menu for transmitting the selected content to the external device in the first user terminal device  200 , and the second user interface may include a menu for receiving the selected content from the external device in the second user terminal device  300 . 
         [0114]    The first user terminal device  200 , in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may transmit information about identifier information and an encryption key of the first user terminal device  200  to the input apparatus  100 , and the second user terminal device  300 , in response to a menu for receiving the selected content from an external device being selected in the second user interface, may receive the information about the identifier information and the encryption key of the first user terminal device  200  from the input apparatus  100 . 
         [0115]    The process of displaying the first user interface and the second user interface and features of the first user interface and the second user interface are as described above in  FIG. 3A  and  FIG. 5 . 
         [0116]      FIG. 8  is a timing chart describing an operation process of the system according to an exemplary embodiment. 
         [0117]    Referring to  FIG. 8 , when the input apparatus  100  selects content  101  in the first user terminal device  200  through an input, transmits a control signal  101  for displaying the first user interface to the first user terminal device  200 , and selects a menu  101  for performing a function of transmitting the content from the first user interface which is displayed on a screen of the first user terminal device  200 , the first user terminal device  200  may transmit information  201  about a Mac address and an encryption key of the first user terminal device  200  to the input apparatus  100 . 
         [0118]    Further, when the input apparatus  100  transmits a control signal  102  for displaying the second user interface to the second user terminal device  300 , selects a menu  102  for performing a function of receiving the content from the second user interface which is displayed on a screen of the second user terminal device  300 , and transmits the information  102  about the Mac address and the encryption key of the first user terminal device  200  to the second user terminal device  300 , the second user terminal device  300  may encrypt the Mac address  301  of the second user terminal device  300  based on the received encryption key and may transmit  302  the encrypted Mac address of the second user terminal device  300  to the first user terminal device  200  along with the Mac address of the first user terminal device  200 . 
         [0119]    The first user terminal device  200  may decrypt the Mac address of the second user terminal device  300  received from the second user terminal device  300  and pairs up with the second user terminal device  300 . 
         [0120]    Once paring between the first user terminal device  200  and the second user terminal device  300  is completed, the first user terminal device  200  may transmit the selected content to the second user terminal device  300 . 
         [0121]      FIG. 9  is a view showing transmitting content according to an exemplary embodiment. 
         [0122]    Referring to  FIG. 9 , after an object  910  in an image displayed on a screen of the first user terminal device  200  is selected by the input apparatus  100 , the first user interface  920  may be displayed on the screen of the first user terminal device  200 , and a menu  930  may be selected for performing a function for transmitting on the first user interface  920  through the input apparatus  100 . 
         [0123]    Further, the second user interface  940  may be displayed on the screen of the second user terminal device  300  by the input apparatus  100 , and in response to a menu  950  on the second user interface  940  being selected for performing a function for receiving through the input apparatus  100 , the object  910  selected through the input apparatus  100  may be displayed on the screen of the second user terminal device  300 . 
         [0124]    The input apparatus  100  may receive information about identifier information and an encryption key of the first user terminal device  200  from the first user terminal device  200  and may transmit them to the second user terminal device  300 , and after the second user terminal device  300  encrypts the identifier information of the second user terminal device  300  based on the received encryption key and transmits the information to the first user terminal device  200 , the first user terminal device  200  may transmit the selected object  910  to the second user terminal device  300  and the operation of the processor  120  may be applied identically. 
         [0125]    The first user terminal device  200  may generate an encryption key when a predetermined pattern of input is detected through the input apparatus  100  on the screen of the first user terminal device  200 . 
         [0126]    For example, if a user inputs a pattern through the input apparatus  100  on the screen of the first user terminal device  200 , the first user terminal device  200  may generate an encryption key based on the predetermined input pattern. 
         [0127]    If a user inputs the predetermined pattern through the input apparatus  100  on the screen of the second user terminal device  300 , the input apparatus  100  may transmit information about identifier information and an encryption key of the first user terminal device  200  to the second user terminal device  300 . 
         [0128]    In a case, for example, where a user signs electronically with the input apparatus  100 , the electronic signature may be corresponded to a predetermined input pattern, and accordingly, every time the user signs electronically through the input apparatus  100 , the first user terminal device  200  may generate an encryption key. 
         [0129]    Further, for example, in a case where a user signs electronically with the input apparatus  100  for the second user terminal device  300 , the input apparatus  100  may transmit the encryption key generated from the first user terminal device  200  and the identifier information of the first user terminal device  200  to the second user terminal device  300 , and accordingly, an electronic approval may be performed while the first user terminal device  200  and the second user terminal device  300  are linked with each other. 
         [0130]    Accordingly, a data transmission process between the processor  120  and the input apparatus  100 , the first user terminal device  200 , and the second user terminal device  300  may be applied to an exemplary embodiment where an electronic approval is performed when signed electronically. 
         [0131]    Content may include various types of files, and the file may include music, picture, text, video, document, and the like. 
         [0132]      FIG. 10  is a flow chart illustrating a controlling method of the input apparatus capable of receiving an input according to an exemplary embodiment. 
         [0133]    The controlling method of the input apparatus capable of receiving an input, in response to content being selected from the first user terminal device through the input apparatus and a first predetermined event occurring, includes receiving information about identifier information and an encryption key of the first user terminal device from the first user terminal device S 1010 . 
         [0134]    Further, in response to the second predetermined event occurring, the controlling method includes transmitting the received information about the identifier information and the encryption key of the first terminal device to the second user terminal device S 1020 . 
         [0135]    The first predetermined event includes an event where a function of transmitting the selected content to an external device is performed in the first user terminal device through the input apparatus, and the second predetermined event includes an event where a function of receiving the selected content from an external device is performed in the second user terminal device through the input apparatus. 
         [0136]    On the other hand, the controlling method of the input apparatus capable of receiving an input according to an exemplary embodiment, in response to the function key equipped with the input apparatus being pressed upon user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the first user terminal device, includes transmitting a control signal to the first user terminal device for displaying the first user interface on the screen of the first user terminal device and, in response to the function key equipped with the input apparatus being pressed upon the user manipulation while the input apparatus is located within a predetermined range of distance from a screen of the second user terminal device, transmitting a control signal to the second user terminal device for displaying the second user interface on the screen of the second user terminal device. 
         [0137]    The first user interface includes a menu for transmitting the selected content to an external device in the first user terminal device, and the second user interface includes a menu for receiving the selected content from an external device in the second user terminal device. 
         [0138]    Receiving the information from the first user terminal device, in response to a menu for transmitting the selected content to an external device being selected in the first user interface, may receive information about identifier information and an encryption key of the first user terminal device from the first user terminal device, and transmitting the information to the second user terminal device, in response to a menu for receiving the selected content from an external device being selected in the second user interface, may transmit the information about the identifier information and the encryption key of the first user terminal device to the second user terminal device 
         [0139]    The controlling method of the input apparatus capable of receiving an input according to an exemplary embodiment may further include storing information about identifier information and an encryption key of the first user terminal device received from the first user terminal device 
         [0140]    The encryption key may be used for encrypting identifier information of the second user terminal device. 
         [0141]    The controlling method of the input apparatus capable of receiving an input according to an exemplary embodiment may be embodied in a program code executable by a computer and stored in a various non-transitory computer readable medium, and then, may be provided to each device as to be performed by the controller. 
         [0142]    For an exemplary embodiment, in response to content being selected in the first user terminal device through the input apparatus and the first predetermined event occurring, a non-transitory computer readable medium storing a program that performs the controlling method which includes receiving information about identifier information and an encryption key of the first user terminal device from the first user terminal device and transmitting the information about the identifier information and the encryption key of the first user terminal device to the second user terminal device may be provided. 
         [0143]    The non-transitory computer readable medium is not a medium that stores data for a short period of time like a register, cache memory, and the like but may be defined as a medium that stores data semi-permanently and that is readable by a device. Various applications or programs may be stored in and provided through a non-transitory computer readable medium such as a CD, a DVD, a hard disk, a blue-ray disc, a USB, a memory card, a ROM, and the like. 
         [0144]    The block diagram illustrating the input apparatus capable of receiving an input does not show a bus, but each component of the input apparatus capable of receiving an input may be linked with each other through a bus. Further, each device may further include a controller such as a CPU, a micro controller, and the like, which performs the various processes described above. 
         [0145]    Although exemplary embodiments are illustrated and described, the exemplary embodiment shall not be construed as limiting to the foregoing exemplary embodiments, and without departing from the principles and spirit of the scope of which is defined in the appended claims, many alternatives and variations will be apparent to those skilled in the art, and the alternatives and variations shall not be acknowledged independently from the technical idea and prospect of the exemplary embodiment.