I have wanted to take a screen grab of a DVD now and again, even though I usually don't watch movies on my desktop (an office chair just isn't as comfortable as a couch).
So, obviously, play the DVD, choose Video -> Maximum Size, or hit Command-3, then
Boing Boing: HOWTO defeat Apple's anti-DVD-screenshot DRM
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.
oh, and per Random Tech - more Unix screenshot commands
Tags: Apple, /screen_shot