How to block a linux program from being print screened? [closed]

Question

I need to prevent my users from print screening the data that my program displays. Right now the idea I have is to make it a full screen program, where probably calling any other linux shortcuts or applications is blocked, and the print screen key is blocked. Is this approach correct? How would I go about getting this done?

Update: My users are confined to not running a virtual machine, and they do not have cameras. They are also using the GNOME desktop environment.

Update: The systems are mine. I have just granted them temporary access, So the systems, or their operating systems will not be tampered with. They cannot plug in any USB devices, and the users are mostly quite unknowledgeable about linux.

Answer 1

My approach would be to not use GNOME or any other multitasking window manager, but simply have your application be the only client of the X server in question. (Maybe together with a special windowmanager which puts the window in full screen, and logs out when the program is closed.)

Setup your X server so it does not accept any other connections, and/or deny your users the ability to start any other programs on your computer (e.g. no shell login).

Answer 2

This is impossible. You cannot block 'screenshotting' from every level.

For example, even if you somehow disabled the key binding, blocked the gnome-screenshot utility, and so on, the user could still pipe the contents of the framebuffer device file to a file.