Disabling Alt+Print Screen

Does anyone know how to restrict participants from using the Alt + print screen functionality? I was able to use actions to restrict Right+Click and other key board use but the Alt+ Print Screen still works. We want to restrict any ability to copy and paste any of our material. We have added some small watermarks but they can easily be covered with a white graphic box from Word or any graphics program. Any ideas would be appreciated... ThanxDoes anyone know how to restrict participants from using the Alt + print screen functionality? I was able to use actions to restrict Right+Click and other key board use but the Alt+ Print Screen still works. We want to restrict any ability to copy and paste any of our material. We have added some small watermarks but they can easily be covered with a white graphic box from Word or any graphics program. Any ideas would be appreciated... Thanx