There is some feature in Windows through
display hardware that makes it possible to
prevent screen capture of a window. In the
captured screen the windows appears blacked
out. Sorry but I don't exactly remember this. Search
on net, you will definietly find it.

HTH,

you could write a little tool which polls the clipboard and kills every
print-screen like content if it finds some

Hi,

I believe that something like this is possible through DirectX.

I definitely agree with Kirk Ferdmann:
"First of all there is no need to include all those NGs in cross-posting.
Secondly it usually considerd inpolite to ask a question in a NG and request
the answer to be emailed to you - there are other people who can potentially
benefit from reading it."

Regards,
Filip