PrintScreen - Screen capture

I have a problem.....

I've made a image encrypting component and program....
And I've made an imageviewer tp view these encrypted pictures.

But I have one "small" problem.....

Is there ANY WAY to stop people from taking a "print screen" or to
capture the screen with some kind of program?????

Is there a windows message my program can pick up or something?????

PLEASE help me with this one...

Thanx,

Morten

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