How can you prevent a window being captured by Print-Screen?

Posted by John on Stack Overflow See other posts from Stack Overflow or by John
Published on 2010-06-11T12:21:21Z Indexed on 2010/06/11 12:22 UTC
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Windows

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win32

I noticed a few times than when I print-screen while Media Player is running, the content is replaced with a grey rectangle. I've no idea if it's deliberate due to DRM, or some technical issue, but it struck me that being able to deliberately block screen-capture might be a useful feature in some scenarios.

Is there some specific message each HWND gets for print-screen - does Windows do a special repaint or simply dump buffers to the clipboard?

I guess I'd prefer to focus this on Win32 specifically, but as long as it's Windows-related then fine.

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