Easier solution than DVDExtractor:
I was recently delighted to figure out how to digitize copy protect DVDs. I've only tried this on ones I own the rights to, of course.
* Final Cut Pro (or iMovie, or something)
* a DV deck or camcorder
* an external DVD player (other than your Mac)
1) Your DV device (mine is a JVC SR-VS20 deck) needs to support ANALOG A/V input. Plug your DVD player into the A/V IN of your DV device.
2) Connect your DV device by FireWire to your Mac.
3) Play your DVD. The analog AV out is digitized by the DV device, then sent through FireWire to your Mac. Digitize whatever you feel like.
[NOTE: If you hit RECORD on your DV device while doing this, things will probably stop and you'll get a COPY GUARD kind of error. Even though my JVC deck doesn't allow me to RECORD a DVD to DV tape, it DOES allow me to pass the signal through to FireWire.
4) Try to play your digitized movie back in Final Cut. IT DOESN'T WORK! You can see stills, but not moving video. When you export those stills, you only get a white, empty square. Darn copy protection! But wait...
5) CROP your movie in Final Cut (I assume there's a way to do this in iMovie too). Your computer is seeing the copy protection signal somewhere on the edge of the frame. I cropped the video down to a size exactly the same size as the letterboxed image. So the image is unchanged, yet that pesky copyright info hidden at the edges IS NO MORE.
6) Render, then play back your video. Now it works! Grab stills, compress, edit, and burn video and audio back to a fresh DVD at will.
Don't do step 1 through 6 if you don't own the copyright to the DVD.
Let me know how this works for you.
Note: the trick is getting your DV device to pass the analog video through to FireWire. My JVC did it, but my tiny Sony camcorder would not. The problem: when you hook a FireWire up to the Sony, it assumes you want to record from FireWire. So you need a DV device that lets you manually set which input you'll be using (analog, in this case).