Taking Screenshots of your DVD Player in OSX

Apple disables the OSX screenshot capability while a DVD is playing. There is a work-around, though, for those times when you want to make a screenshot of your DVD player — via Boingboing

1. Put your DVD in your computer and open DVD Player (Applications < DVD Player) if it does not open automatically. Go to Video < Maximum Size, or hit Command-3. Fast forward to the frame you want to capture, or select the scene to start at.
2. Open the Terminal (Applications -> Utilities -> Terminal). Type this, or copy / paste it right in the Terminal:
   screencapture -i ~/Desktop/dvd.jpg
   Your mouse should turn into crosshairs. Now hit the space bar. Your mouse should now be a camera. Click the window the DVD is playing in. A file called dvd.jpg will appear on your desktop.