Something like MacTheRipper and ffmpegX or MPEG Streamclip should do the trick then something like Toast to burn it. Just do a search there are a fair few threads on these boards already.
Edit: I should mention MPEG Streamclip doesn't seem to work with the sound and you end up with uncompressed sound so you will probably be best separating the streams then muxing them again.
Comments
Are these dvd's you own?
iDunno
Edit: I should mention MPEG Streamclip doesn't seem to work with the sound and you end up with uncompressed sound so you will probably be best separating the streams then muxing them again.