Abstract:
A control method of a recoverable file protection device and a protection method of a recoverable file are provided. After a file owner sets a secured content in an unprotected data, a secured content protection mode is selected. In accordance with the secured protection mode, the recoverable file protection device can move the secured content and the marked content can replace the secured content. An authentication key is inputted to encrypt the secured content. If a user would like to open the file, the user is requested to verify an identification data. If the identification data complies with the authentication key, the recoverable file protection device moves the secured content to recover the original content. If the identification data doesn&#39;t comply with the authentication key, the file content without the secured content is opened. Therefore, a security of an e-file can be achieved.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Taiwan patent application No. 104123944, filed on Jul. 23, 2015, the disclosure of which is incorporated herein in its entirety by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a control method of a recoverable file protection device and a protection method of a recoverable file, and more particularly relates to a control method of a recoverable file protection device and a protection method for a secured content of the recoverable file in accordance with a secured content protection mode. 
         [0004]    2. Description of Related Art 
         [0005]    Owing to the rising awareness of environmental protection, people gradually implement electronic means to transfer data. During electronic file (e-file) transferring, if the e-file is a confidential file without any protection, an unpredictable loss and damage for a company or a person might occur. 
         [0006]    The conventional e-file protection technique is to secure it by encrypting. Once the user would like to access the content of an encrypted e-file, the encrypted c-file has to be decrypted first. 
         [0007]    However, according to the aforementioned method, if the file owner only hopes to show partial content in the e-file to the user, the e-file has to be redacted before provided to the user. If the e-file is not redacted before providing to the user, the user can access the whole content in the e-file. Moreover, if the file owner will like to provide many different users to access the e-file and the content for each one of the users is different, the e-file has to generate many copies and the content in each copy of the e-file redacted in accordance with a limitation of the user&#39;s access authority. The aforementioned method is wasting time and many duplicated documents have to be maintained and the confidentiality is under extreme risk. 
         [0008]    In addition, the conventional method also implements a masking method to erase confidential information in the e-file and the meaningless notations are used to replace the erased content for the user so as to achieve security effect. 
         [0009]    However, after the procedure to mask the content of the e-file in accordance with the aforementioned method is performed, the content of the e-file cannot be recovered completely. When the file owner would like to edit the original c-file and provide the e-file to different users, the file owner has to rewrite the erased content within the e-file and mask the content of the e-file again in accordance with the access authority of the users so as to let the user access the file. Accordingly, it is inconvenient for the file owner to operate. 
         [0010]    According to the aforementioned description, the problem of the inconvenience of the encrypting manner of the protection method and the security of the e-file indeed needs to be further improved in related industries. 
       SUMMARY OF THE INVENTION 
       [0011]    In order to overcome a secure and inconvenient problem of the aforementioned e-file, a control method of a recoverable file protection device is disclosed in the present invention and comprises steps of: 
         [0012]    displaying a file including a normal data zone and a customized hidden zone by the recoverable file protection device, and storing an unprotected data in the normal data zone; 
         [0013]    opening a file protection program via the recoverable file protection device by a file owner; 
         [0014]    setting a secured content in the unprotected data by the file owner after opening the file protection program via the recoverable file protection device; 
         [0015]    setting a secured content protection mode after setting the secured content in the recoverable file protection device; 
         [0016]    moving the secured content from the unprotected data to the customized hidden zone in accordance with the secured content protection mode by the recoverable file protection device; 
         [0017]    saving the unprotected data without the secured content in the normal data zone to form a first protection data by the recoverable file protection device; 
         [0018]    encrypting the secured content with an authentication key inputted by the file owner via the recoverable file protection device; 
         [0019]    requesting a user to input an identification verifying data when the recoverable file protection device receives a control signal to open the file; and 
         [0020]    comparing the identification verifying data with the authentication key by the recoverable file protection device; 
         [0021]    moving the secured content from the customized hidden zone and the first protection data from the normal data zone to recover the unprotected data via the file protection program in the recoverable file protection device when the identification verifying data complies with the authentication key; and 
         [0022]    displaying the first protection data by the recoverable file protection device when the identification verifying data does not comply with the authentication key. 
         [0023]    In order to achieve the aforementioned objective, the present invention also provides a control method of a recoverable file protection device comprising the following steps: 
         [0024]    connecting the recoverable file protection device with a server; 
         [0025]    receiving a file sharing protection rule and an authentication key from the server, and the file sharing protection rule including a file secured content and a file secured content protection mode; 
         [0026]    displaying a file including a normal data zone and a customized hidden zone by the recoverable file protection device, and saving an unprotected data in the normal data zone; 
         [0027]    opening a file protection program by a file owner in the recoverable file protection device; 
         [0028]    setting the file secured content in accordance with the file sharing protection rule after opening the file protection program in the recoverable file protection device and moving the file secured content to the customized hidden zone in accordance with the file secured content protection mode of the file sharing protection rule; 
         [0029]    saving the unprotected data without the file secured content in the normal data zone to form a first protection data by the recoverable file protection device; 
         [0030]    encrypting the file secured content with the authentication key by the recoverable file protection device; 
         [0031]    requesting a user to input an identification verifying data when the recoverable file protection device receives a control signal to open the file; 
         [0032]    comparing the identification verifying data with the authentication key by the recoverable file protection device; 
         [0033]    moving the file secured content from the customized hidden zone and the first protection data from the normal data zone to recover the unprotected data by the file protection program of the recoverable file protection device when the identification verifying data complies with the authentication key; and 
         [0034]    displaying the first protection data by the recoverable file protection device when the identification verifying data does not comply with the authentication key. 
         [0035]    In order to achieve the aforementioned objective, the present invention also proposes a protection method of a recoverable file comprising the following steps: 
         [0036]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone; 
         [0037]    opening a file protection program; 
         [0038]    setting a secured content in the unprotected data; 
         [0039]    setting a secured content protection mode after setting the secured content; 
         [0040]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode; 
         [0041]    saving the unprotected data without the secured content in the normal data zone to form a first protection data; 
         [0042]    inputting an authentication key to encrypt the secured content; 
         [0043]    requesting to input an identification verifying data when receiving a control signal to open the file; 
         [0044]    moving the secured content from the customized hidden zone and the first protection data of the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key; and 
         [0045]    displaying the first protection data when the identification verifying data does not comply with the authentication key. 
         [0046]    According to the aforementioned description, in the control method of the recoverable file protection device and the protection method of the recoverable file, the file owner can provide different secured contents to different users in accordance with the users&#39; different access authorities in the unprotected data. After verifying the identification and access authority of the user, the protected file is recovered to be the unprotected data to reduce the inconvenience of the user to produce the e-file and enhance a confidentiality effect. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0047]      FIG. 1A  and  FIG. 1B  are structural views of a control method of a recoverable file protection device in a first embodiment of the present invention; 
           [0048]      FIG. 2  is a structural view in a second embodiment of the control method the present invention; 
           [0049]      FIG. 3  is a view of an example in the first embodiment of the control method of the present invention; 
           [0050]      FIG. 4  is a view of an example in the second embodiment of the control method the present invention; 
           [0051]      FIG. 5  is a view of a third embodiment of the control method of the present invention; 
           [0052]      FIG. 6  is a flow chart of the recoverable file protection method; 
           [0053]      FIG. 7  is another flow chart of the protection method of the recoverable file; 
           [0054]      FIG. 8  is still another flow chart of the protection method of the recoverable file; 
           [0055]      FIG. 9  is a flow chart of a protection method of the recoverable file in the second embodiment of the present invention; 
           [0056]      FIG. 10  is another flow chart of the protection method of the recoverable file in the second embodiment of the present invention; and 
           [0057]      FIG. 11  is still another flow chart of the protection method of the recoverable file in the second embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0058]    These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. 
         [0059]    With reference to  FIG. 1A  and  FIG. 1B ,  FIG. 1A  and  FIG. 1B  are structural views of a control method of a recoverable file protection device in a first embodiment of the present invention. The present invention proposes the recoverable file protection device  11 , which can be a laptop or a desktop. A file owner and a user in the present embodiment can operate the control method by implementing the recoverable file protection device. 
         [0060]    Specifically, in an organization, different persons have different priorities and responsibilities. Therefore, when the file owner  2  would like to provide the file to the user  3  in accordance with the user&#39;s access authorities, the file owner  2  operates the recoverable file protection device  11  and the recoverable file protection device  11  displays the file in accordance with the operation from the file owner  2 . The file&#39;s format is designed to include a normal data zone and a customized hidden zone so that can handle new usage or various requirements of the application. Unprotected data is stored in the normal data zone. 
         [0061]    Thereafter, the file owner  2  opens a file protection program from the recoverable file protection device  11 . After opening the file protection program, the file owner  2  sets a secured content in the unprotected data. After the file owner  2  sets the secured content, a secured content protection mode is further selected. The recoverable file protection device  11  moves the secured content to the customized hidden zone in accordance with the secured content protection mode and the unprotected data without the secured content is saved in the normal data zone to form a first protection data. After forming the first protection data, the file owner  2  inputs an authentication key to encrypt the secured content. 
         [0062]    Moreover, the file owner  2  transfers the protected file to the user  3  via the Internet or a mobile storage medium. Since the file owner  2  is to secure the file in accordance with the access authority of the user  3 , only the first protection data can be accessed when the user  3  receives the file. If the user  3  would like to further access the file, a control signal is transmitted to notify the recoverable file protection device  11  that the user  3  wants to open the secured content saved in the customized hidden zone. When the recoverable file protection device  11  receives the control signal, the recoverable file protection device  11  will request the user  3  to input the identification verifying data. The user  3  can input the identification verifying data via the desktop or the identification verifying data in an identification verifying device is transmitted to the recoverable file protection device  11  when the identification verifying device with the identification verifying data is connected with the recoverable file protection device  11 . The identification verifying device can be a Universal Serial Bus (USB) device  13 . 
         [0063]    After the user  3  inputted the identification verifying data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. When the identification verifying data complies with the authentication key, the recoverable file protection device  11  moves the secure content from the customized hidden zone and the first protection data of the normal data zone to recover the unprotected data. On the contrary, when the authentication key inputted by the user  3  does not comply with the identification verifying key, the recoverable file protection device  11  displays the first protection data to the user  3 , who failed to pass the identification verifying procedure. 
         [0064]    Furthermore, after the file owner  2  sets the secured content at the unprotected data in the recoverable file protection device  11  of the aforementioned embodiment, the secured content protection mode is set. And the secured content is moved to the customized hidden zone according to the secured content protection mode. After moving the secured content, a marked content is inserted in the position of the secured content of the unprotected data so that the unprotected data includes the marked content. Further, the unprotected data including the marked content is saved in the normal data zone to form the first protection data. 
         [0065]    Also, after setting the secured content protection mode, the recoverable file protection device  11  duplicates the secured content to generate another secured content in accordance with the secured content protection mode. Then, the duplicated secured content is moved to the customized hidden zone. After the duplicated secured content is moved, the marked content replaces the secured content in the unprotected data so that the unprotected data includes the marked content. Further, the unprotected data including the marked content is saved in the normal data zone to form the first protection data. 
         [0066]    With reference to  FIG. 2 ,  FIG. 2  is a structural view of a second embodiment of the present invention. First of all, the file owner  2  operates the recoverable file protection device  11  to receive a file sharing protection rule created by the administrator  4  from the server  12 . The file sharing protection rule includes a file secured content and a file secured content protection mode, and the file sharing protection rule is saved in the recoverable file protection device  11 . In an organization, different persons have different responsibilities and priorities. Therefore, when the file owner  2  would like to provide the file to the user  3  in accordance with the user&#39;s access authorities, the file owner  2  operates the recoverable file protection device  11  and the recoverable file protection device  11  displays the file in accordance with the operation from the file owner  2 . The file&#39;s format is designed to include a normal data zone and a customized hidden zone so that can handle new usage or various requirements of the application. Unprotected data is stored in the normal data zone. 
         [0067]    Thereafter, the file owner  2  opens a file protection program from the recoverable file protection device  11 . After opening the file protection program, the file owner  2  sets a secured content in the unprotected data. After the file owner  2  sets the secured content, a secured content protection mode is further selected. And then the recoverable file protection device  11  moves the secured content to the customized hidden zone in accordance with the secured content protection mode. Thereafter, the unprotected data without the secured content replaces the unprotected data and saves in the normal data zone to form a first protection data. The file owner  2  establishes the file sharing protection rule and the recoverable file protection device  11  sets up the file secured content at the first protection data in accordance with the file secured content of the file sharing protection rule. Then, the recoverable file protection device  11  moves the file secured content to the customized hidden zone in accordance with the file secured content protection mode (the customized hidden zone includes the secured content and file secured content at this moment), and the first protection data without the file secured content replaces the first protection data saving in the normal data zone to form a second protection data. After forming the second protection data, the file owner  2  inputs the authentication key via the recoverable file protection device  11  to encrypt the file secured content and the secured content. 
         [0068]    Furthermore, the aforementioned embodiment can also be used to set the file secured content protection mode. The recoverable file protection device  11  moves the file secured content to the customized hidden zone in accordance with the file secured content protection mode. After the file secured content is moved out, the marked content is inserted in a position of the file secured content so that the first protection data includes the marked content. Further, the first protection data including the marked content is saved in the normal data zone to form the second protection data. 
         [0069]    Also, after setting the file secured content protection mode, the recoverable file protection device  11  duplicates the file secured content to generate another file secured content. Then, the duplicated file secured content is moved to the customized hidden zone. After the duplicated file secured content is moved, the marked content replaces the file secured content of the first protection data so that the first protection data includes the marked content. Further, the first protection data including the marked content is saved in the normal data zone to form the second protection data. 
         [0070]    Moreover, the file owner  2  transfers the file (the second protection data, the secured content and the file secured content) to the user  3  via the Internet or the mobile storage medium. The file owner  2  and an administrator  4  set the secured content and the file secured content in the unprotected data according to the access authority of the user  3 . After setting the secured content and the file secured content, the second protection data is generated. When the user  3  receives the file, only the second protection data can be accessed. If the user  3  would like to further access the file, the control signal is transmitted to notify the recoverable file protection device  11  to open the unprotected data. When the recoverable file protection device  11  receives the control signal, the recoverable file protection device  11  will ask the user  3  to input the identification verifying data. 
         [0071]    After the user  3  inputs the identification verifying data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. When the identification verifying data complies with the authentication key, the recoverable file protection device  11  moves the secured content and the file secured content from the customized hidden zone and the second protection data from the normal data zone to recover the unprotected data by the file protection program. On the contrary, if the identification verifying data inputted by the user  3  does not comply with the authentication key, the recoverable file protection device  11  displays the second protection data to the user  3  to access. 
         [0072]    Furthermore, the recoverable file protection device  11  in the aforementioned first embodiment or second embodiment can create a file managing rule by the file owner  2  after forming the first protection data or the second protection data. The recoverable file protection device  11  forbids file printing, file duplicating and file editing, sets file usage expiration date, sets file usage frequency and time, displays watermark in the file or adds texts automatically in the file. 
         [0073]    For example, with reference to  FIG. 3 ,  FIG. 3  is a view of an example in the first embodiment of the present invention. The file owner  2  operates the recoverable file protection device  11  and the recoverable file protection device  11  displays the file in accordance with the operation from the file owner  2 . The file&#39;s format is designed to include a normal data zone  21  and a customized hidden zone  22  so that can handle new usage or various requirements of the application. Unprotected data  311  is stored in the normal data zone  21 . 
         [0074]    Thereafter, the file owner  2  opens a file protection program via the recoverable file protection device  11 . After opening the file protection program, the file owner  2  sets a secured content (such as “IT protection system”) in the unprotected data  311 . After the file owner  2  sets the secured content (“IT protection system”), a secured content protection mode (such as a hidden mode) is further selected. The recoverable file protection device  11  moves the secured content (“IT protection system”) to the customized hidden zone  22  in accordance with the secured content protection mode (the hidden mode), and the unprotected data  311  without the secured content (“IT protection system”) replaces the unprotected data  311  to form a first protection data  312 . After forming the first protection data  312 , the file owner  2  inputs an authentication key to encrypt the secured content (“IT protection system”). 
         [0075]    Moreover, the file owner  2  transfers the protected file to the user  3  via the Internet or a mobile storage medium. Since the file owner  2  secures the file in accordance with the access authority of the user  3 , only the first protection data  312  can be accessed when the user  3  receives the file. If the user  3  would like to further access the file, a control signal is transmitted to notify the recoverable file protection device  11  to open the unprotected data  311 . When the recoverable file protection device  11  receives the control signal, the recoverable file protection device  11  will ask the user  3  to input the identification verifying data. 
         [0076]    After the user  3  inputs the identification verifying data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. When the identification verifying data complies with the authentication key, the recoverable file protection device  11  moves the secured content (“IT protection system”) from the customized hidden zone  22  and the first protection data from the normal data zone  21  to recover the unprotected data  311  via the file protection program. On the contrary, after the user  3  inputs the identification verification data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. If the identification verifying data doesn&#39;t comply with the authentication key, the recoverable file protection device  11  displays the first protection data  312 . 
         [0077]    In another example, with reference to  FIG. 4 ,  FIG. 4  is a view of the example in the second embodiment of the present invention. After the recoverable file protection device  11  is connected with the server  12  and the administrator  4  creates the file sharing protection rule  411  by the server  12 , the file sharing protection rule  411  is transmitted to the recoverable file protection device  11  to be saved. The file sharing protection rule  411  includes a file secured content and a file secured content protection mode. The file owner  2  operates the recoverable file protection device  11  and the recoverable file protection device  11  displays the file in accordance with the operation from the file owner  2 . The file&#39;s format is designed to include a normal data zone  21  and a customized hidden zone  22  so that can handle new usage or various requirements of the application. Unprotected data  311  is stored in the normal data zone  21 . 
         [0078]    Thereafter, the file owner  2  opens a file protection program from the recoverable file protection device  11 . After opening the file protection program, the file owner  2  sets a secured content (such as “IT protection system”) in the unprotected data  311 . After the file owner  2  sets the secured content (“IT protection system”), a secured content protection mode (such as a covering mode) is further selected. The recoverable file protection device  11  moves the secured content (“IT protection system”) to the customized hidden zone  22  in accordance with the secured content protection mode (the covering mode), and the secured content (“IT protection system”) of the unprotected data  311  is replaced by the marked content (such as “*”). After the marked content (such as “*”) replaced the secured content (“IT protection system”) of the unprotected data  311 , the replaced unprotected data is saved in the normal data zone  21  to replace the unprotected data  311  so that forms the first protection data  312 . In addition, the file owner  2  selects the file sharing protection rule  411  and the recoverable file protection device  11  sets the file secured content (such as “Inwellcom”) at the first protection data  312  in accordance with the file secured content (“Inwellcom”) of the file sharing protection rule  411 . 
         [0079]    Thereafter, after setting the file secured content (“Inwellcom”), the recoverable file protection device  11  moves the file secured content (“Inwellcom”) to the customized hidden zone  22  in accordance with the file secured content protection mode (the covering mode)(the customized hidden zone  22  includes the secured content “IT protection system” and “Inwellcom” at this moment). The marked content (such as “*”) replaces the file secured content (“Inwellcom”) of the first protection data so that the first protection data includes the marked content (such as “*”). Further, the first protection data including the marked content (such as “*”) is saved in the normal data zone  21  to form a second protection data  313 . After forming the second protection data  313 , the file owner  2  inputs the authentication key to encrypt the file secured content (“Inwellcom”) and the secured content (“IT protection system”). 
         [0080]    Furthermore, the file owner  2  transfers the protected file to the user  3  via the Internet or the mobile storage medium. When the user  3  receives the file, only the second protection data  313  can be accessed. If the user  3  would like to further access the file, the control signal is transmitted to notify the recoverable file protection device  11  to open the unprotected data  311 . When the recoverable file protection device  11  receives the control signal, the recoverable file protection device  11  will ask the user  3  to input the identification verifying data. 
         [0081]    After the user  3  inputs the identification verifying data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. When the identification verifying data complies with the authentication key, the recoverable file protection device  11  moves the file secured content (“Inwellcom”) and the secured content (“IT protection system”) from the customized hidden zone  22  and the second protection data  313  from the normal data zone  21  to recover the unprotected data  311  via the file protection program. On the contrary, after the user  3  inputs the identification verification data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. If the identification verifying data does not comply with the authentication key, the recoverable file protection device  11  displays the second protection data  313 . 
         [0082]    Furthermore, with reference to  FIG. 5 ,  FIG. 5  is a view of a third embodiment of the present invention. After the recoverable file protection device  11  is connected with the server  12  and the server  12  receives the file sharing protection rule  411  created by the administrator  4 , the file sharing protection rule  411  is saved in the recoverable file protection device  11 . At first, the file owner  2  operates the recoverable file protection device  11  and the recoverable file protection device  11  displays the file in accordance with the operation from the file owner  2 . The file&#39;s format is designed to include a normal data zone  21  and a customized hidden zone  22  so that can handle new usage or various requirements of the application. Unprotected data  311  is stored in the normal data zone  21 . 
         [0083]    Thereafter, the file owner  2  opens a file protection program from the recoverable file protection device  11 . After opening the file protection program, the file owner  2  chooses the file sharing protection rule  411 . After choosing the file sharing protection rule  411 , the recoverable file protection device  11  sets a file secured content (such as “SN: 12345678”) and a file secured content protection mode (such as the hidden mode). The recoverable file protection device  11  moves the file secured content (“SN: 12345678”) to the customized hidden zone  22  and the unprotected data  311  without the file secured content is saved in the normal data zone  21  to form a first protection data  312 . After forming the first protection data  312 , the file owner  2  inputs the authentication key via the recoverable file protection device  11  to encrypt the file secured content. 
         [0084]    Furthermore, after the aforementioned embodiment sets the file secured content protection mode, the recoverable file protection device  11  moves the file secured content to the customized hidden zone in accordance with the file secured content protection mode. After moving the file secured content, the marked content is inserted in the position of the file secured content of the unprotected data  311  so that the unprotected data  311  includes the marked content. Further, the unprotected data  311  including the marked content is saved in the normal data zone  21  to form the first protection data. 
         [0085]    Also, after setting the file secured content protection mode, the recoverable file protection device  11  duplicates the file secured content in accordance with the file secured content protection mode to form another file secured content. Thereafter, the duplicated file secured content is moved to the customized hidden zone  22 . After moving the duplicated file secured content to the customized hidden zone  22 , the marked content replaces the file secured content so that the unprotected data includes the marked content. Further, the unprotected data including the marked content is saved in the normal data zone  21  to form the first protection data. 
         [0086]    Moreover, the file owner  2  transfers the protected file to the user  3  via the Internet or a mobile storage medium. Since the file owner  2  protects the unprotected data  311  to form the first protection data  312  in accordance with the access authority of the user  3 , only the first protection data can be accessed when the user  3  receives the file. If the user  3  would like to further access the file, the control signal is transmitted to notify the recoverable file protection device  11  to open the unprotected data  311 . When the recoverable file protection device  11  receives the control signal, the recoverable file protection device  11  will ask the user  3  to input the identification verifying data. 
         [0087]    After the user  3  inputs the identification verifying data, the recoverable file protection device  11  compares the identification verifying data with the authentication key. When the identification verifying data complies with the authentication key, the recoverable file protection device  11  moves the file secured content from the customized hidden zone and the first protection data  312  from the normal data zone to recover the unprotected data  311  by the file  2  protection program. On the contrary, if the identification verifying data inputted by the user  3  does not comply with the authentication key, the recoverable file protection device  11  displays the first protection data  312 . 
         [0088]    In the aforementioned embodiment, after the recoverable file protection device  11  moves the file secured content to the customized hidden zone, the marked content replaces the file secured content of the unprotected data so that the unprotected data includes the marked content. Further, the unprotected data including the marked content is saved in the normal data zone to form the first protection data. 
         [0089]    In addition, the recoverable file protection method in the present invention is shown in  FIG. 6 .  FIG. 6  is a flow chart of the recoverable file protection method and includes the following steps: 
         [0090]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 611 ); 
         [0091]    opening a file protection program (S 612 ); 
         [0092]    setting a secured content in the unprotected data (S 613 ); 
         [0093]    setting a secured content protection mode after setting the secured content (S 614 ); 
         [0094]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode (S 615 ); 
         [0095]    saving the unprotected data without the secured content in the normal data zone to form a first protection data (S 616 ); 
         [0096]    inputting an authentication key to encrypt the secured content (S 617 ); 
         [0097]    requesting to input an identification verifying data when receiving a control signal to open the file (S 618 ); 
         [0098]    moving the secured content from the customized hidden zone and the first protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the first protection data when the identification verifying data does not comply with the authentication key (S 619 ). 
         [0099]    In addition, with reference to  FIG. 7 ,  FIG. 7  is another flow chart of a protection method of the recoverable file and includes the following steps: 
         [0100]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 711 ); 
         [0101]    opening a file protection program (S 712 ); 
         [0102]    setting a secured content in the unprotected data (S 713 ); 
         [0103]    setting a secured content protection mode after setting the secured content (S 714 ); 
         [0104]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode (S 715 ); 
         [0105]    replacing the secured content by a marked content and saving the marked unprotected data in the normal data zone to form a first protection data (S 716 ); 
         [0106]    encrypting the secured content with an authentication key (S 717 ); 
         [0107]    requesting to input an identification verifying data when receiving a control signal to open the file (S 718 ); 
         [0108]    moving the secured content from the customized hidden zone and the first protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the first protection data when the identification verifying data does not comply with the authentication key (S 719 ). 
         [0109]    In addition, with reference to  FIG. 8 ,  FIG. 8  is still another flow chart of a protection method of the recoverable file and includes the following steps: 
         [0110]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 811 ); 
         [0111]    opening a file protection program (S 812 ); 
         [0112]    setting a secured content in the unprotected data and duplicating the secured content (S 813 ); 
         [0113]    setting a secured content protection mode after setting the secured content (S 814 ); 
         [0114]    moving a duplicated secured content to the customized hidden zone in accordance with the secured content protection mode (S 815 ); 
         [0115]    replacing the secured content by a marked content and saving the marked unprotected data in the normal data zone to form a first protection data (S 816 ); 
         [0116]    inputting an authentication key to encrypt the secured content (S 817 ); 
         [0117]    requesting to input an identification verifying data when receiving a control signal to open the file (S 818 ); 
         [0118]    moving the secured content from the customized hidden zone and the first protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the first protection data when the identification verifying data does not comply with the authentication key (S 819 ). 
         [0119]    In addition, with reference to  FIG. 9 ,  FIG. 9  is a flow chart of a protection method of the recoverable file in the second embodiment of the present invention and includes the following steps: 
         [0120]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 911 ); 
         [0121]    opening a file protection program (S 912 ); 
         [0122]    setting a secured content in the unprotected data (S 913 ); 
         [0123]    setting a secured content protection mode after setting the secured content (S 914 ); 
         [0124]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode (S 915 ); 
         [0125]    saving the unprotected data without the secured content in the normal data zone to form a first protection data (S 916 ); 
         [0126]    setting a file sharing protection rule including a file secured content and a file secured content protection mode (S 917 ); 
         [0127]    setting the file secured content for the first protection data in accordance with the file sharing protection rule (S 918 ); 
         [0128]    moving the file secured content to the customized hidden zone in accordance with the file secured content protection mode of the file sharing protection rule (S 919 ); 
         [0129]    moving the first protection data without the file secured content to the normal data zone to form a second protection data (S 920 ); 
         [0130]    encrypting the secured content and the file secured content with an authentication key (S 921 ); 
         [0131]    requesting to input the identification verifying data when receiving a control signal to open the file (S 922 ); 
         [0132]    moving the secured content and the file secured content from the customized hidden zone and the second protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the second protection data when the identification verifying data does not comply with the authentication key (S 923 ). 
         [0133]    In addition, with reference to  FIG. 10 ,  FIG. 10  is another flow chart of a protection method of the recoverable file in the second embodiment of the present invention and includes the following steps: 
         [0134]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 1001 ); 
         [0135]    opening a file protection program (S 1002 ); 
         [0136]    setting a secured content in the unprotected data (S 1003 ); 
         [0137]    setting a secured content protection mode after setting the secured content (S 1004 ); 
         [0138]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode (S 1005 ); 
         [0139]    replacing the secured content by a marked content and saving the marked unprotected data in the normal data zone to form a first protection data (S 1006 ); 
         [0140]    setting a file sharing protection rule including a file secured content and a file secured content protection mode (S 1007 ); 
         [0141]    setting the file secured content in the first protection data in accordance with the file sharing protection rule (S 1008 ); 
         [0142]    moving the file secured content to the customized hidden zone in accordance with the file secured content protection mode of the file sharing protection rule (S 1009 ); 
         [0143]    replacing the file secured content by the marked content and saving the marked first protection data in the normal data zone to form a second protection data (S 1010 ); 
         [0144]    inputting an authentication key to encrypt the secured content and the file secured content (S 1011 ); 
         [0145]    requesting to input the identification verifying data when receiving a control signal to open the file (S 1012 ); 
         [0146]    moving the secured content and the file secured content from the customized hidden zone and the second protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the second protection data when the identification verifying data does not comply with the authentication key (S 1013 ). 
         [0147]    In addition, with reference to  FIG. 11 ,  FIG. 11  is still another flow chart of a protection method of the recoverable file in the second embodiment of the present invention and includes the following steps: 
         [0148]    including a normal data zone and a customized hidden zone in a file and saving an unprotected data in the normal data zone (S 1101 ); 
         [0149]    opening a file protection program (S 1102 ); 
         [0150]    setting a secured content in the unprotected data (S 1103 ); 
         [0151]    setting a secured content protection mode after setting the secured content (S 1104 ); 
         [0152]    moving the secured content to the customized hidden zone in accordance with the secured content protection mode (S 1105 ); 
         [0153]    replacing the secured content by a marked content and saving the marked unprotected data in the normal data zone to form a first protection data (S 1106 ); 
         [0154]    setting a file sharing protection rule including a file secured content and a file secured content protection mode (S 1107 ); 
         [0155]    setting the file secured content in the first protection data in accordance with the file sharing protection rule (S 1108 ); 
         [0156]    duplicating the file secured content in accordance with the file secured content protection mode of the file sharing protection rule and moving a duplicated file secured content to the customized hidden zone (S 1109 ); 
         [0157]    replacing the file secured content by a marked content and saving the marked first protection data in the normal data zone to form a second protection data (S 1110 ); 
         [0158]    encrypting the secured content and the file secured content with an authentication key (S 1111 ); 
         [0159]    requesting to input the identification verifying data when receiving a control signal to open the file (S 1112 ); 
         [0160]    moving the secured content and the file secured content from the customized hidden zone and the second protection data from the normal data zone to recover the unprotected data when the identification verifying data complies with the authentication key, or displaying the second protection data when the identification verifying data does not comply with the authentication key (S 1113 ). 
         [0161]    While the present invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the present invention need not be restricted to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures. Therefore, the above description and illustration should not be taken as limiting the scope of the present invention which is defined by the appended claims.