Apparatus and method for displaying watermark on a screen

1. A watermark display apparatus comprising a processor and a memory storing program codes executed by the processor, wherein the program codes are configured to

receive or intercept a message generated from an operating system (OS) when an application is executed or a document is opened by a user's manipulation;

determine whether a watermark is displayed based on screen watermark display policies and the message generated from the OS; and

display the watermark on a screen when it is determined that the watermark is displayed.

2. The apparatus according to claim 1 , wherein the screen watermark display policies include watermark display target information including at least one of an OS item, an application item, and a document item, which are watermark display targets, and

when an application is executed or a document is opened by the user's manipulation, it is determined whether an item corresponding to the executed application or the opened document is included in the watermark display target information using the message generated from the OS, and when the item corresponding to the executed application or the opened document is included in the watermark display target information, it is determined that the watermark is displayed.

3. The apparatus according to claim 1 , wherein the screen watermark display policies include watermark display information including at least one of content of the watermark, a display size of the watermark, and a display position of the watermark, and

the watermark is displayed on a screen based on the watermark display information.

4. The apparatus according to claim 1 , wherein the watermark is displayed on a screen as a window independent from a window corresponding to the executed application or the opened document.

5. The apparatus according to claim 4 , wherein the window on which the watermark is displayed is displayed in an internal area of the window corresponding to the executed application or the opened document.

6. The apparatus according to claim 1 , wherein, while an application corresponding to the executed application or the opened document operates, when a window corresponding to the executed application or the opened document disappears from a screen, the watermark disappears from the screen.

7. The apparatus according to claim 1 , wherein the screen watermark display policies are set differently for each user.

8. A method of displaying a watermark, comprising:

monitoring a message generated from an operating system (OS) when an application is executed or a document is opened by a user's manipulation;

determining whether a watermark is displayed based on screen watermark display policies and the message; and

displaying the watermark on a screen when it is determined that the watermark is displayed.

9. The method according to claim 8 , wherein the screen watermark display policies include watermark display target information including at least one of an OS item, an application item, and a document item, which are watermark display targets, and

the determining of whether a watermark is displayed includes:

determining, when an application is executed or a document is opened by the user's manipulation, whether an item corresponding to the executed application or the opened document is included in the watermark display target information using the message generated from the OS; and

determining that the watermark is displayed when the item corresponding to the executed application or the opened document is included in the watermark display target information.

10. The method according to claim 9 , wherein the watermark display target information includes a type item of the application or a type item of the document, which is a watermark display target.

11. The method according to claim 9 , wherein each item included in the watermark display target information corresponds to information on a time at which the watermark is displayed.

12. The method according to claim 8 ,

wherein the screen watermark display policies include watermark display information including at least one of content of the watermark, a display size of the watermark, and a display position of the watermark, and

in the displaying of the watermark, the watermark is displayed on a screen based on the watermark display information.

13. The method according to claim 8 , wherein, in the displaying of the watermark, the watermark is displayed on a screen as a window independent from a window corresponding to the executed application or the opened document.

14. The method according to claim 13 , wherein, in the displaying of the watermark, the window on which the watermark is displayed is displayed in an internal area of the window corresponding to the executed application or the opened document.

15. The method according to claim 13 , wherein, in the displaying of the watermark, when a size or a position of the window corresponding to the executed application or the opened document is changed, a size and a position of the window on which the watermark is displayed are maintained without change.

16. The method according to claim 13 , wherein, in the displaying of the watermark, when a size or a position of the window corresponding to the executed application or the opened document is changed, a size of the window on which the watermark is displayed is maintained without change and a position thereof is changed.

17. The method according to claim 8 , wherein, in the displaying of the watermark, while an application corresponding to the executed application or the opened document operates, when a window corresponding to the executed application or the opened document disappears from a screen, the watermark displayed on the screen disappears.

18. The method according to claim 8 , wherein the screen watermark display policies are set differently for each user.

19. A non-transitory computer readable recording medium recording a program causing a computer to execute the watermark display method according to any one of claim 8 .