Quite a while ago I ordered a DVD drive for my old PowerMac G4, and after sitting in a box for roughly two months, I finally installed it. (It was the drive sitting in a box, not me.)
What’s that now? A screenshot of a DVD playing on my Mac? But how? I remember telling my cousin years ago that Apple’s DVD Player application prevented you from taking screenshots, but there were some 3rd-party apps that could probably do it. Much to my surprise, none was needed! I’m still using 10.3.x but the following worked for me:
screencapture ~/Desktop/dvd.pdf
And bango! A PDF on the desktop. It’s the whole screen, not just the DVD being displayed, but it’s a start… (I probably got the idea from macosxhints.com, as there are many other capture suggestions there as well.)