I saw this awesome movie that I watched on DVD and wanted to take a screen shot of it, but when I did, it was transparent. I could only see my desktop taken but not the movie. Is there a specific program or hack that could let me take a screen shot of that content? I tried every screen shot software, but still leaves it transparent.
Try VLC player, under Menu->Video you should see 'Take Snapshot'. As far as I remember it worked for me while I had the same problem (though on windows).
Here is the download link: http://www.videolan.org/vlc/#download