I have had very good luck using mkmkv. It runs under linux/mac/windows and has a very no fuss interface that generates a un-encrypted but otherwise bit-for-bit

I have had very good luck using mkmkv. It runs under linux/mac/windows and has a very no fuss interface that generates a un-encrypted but otherwise bit-for-bit accurate copy of dvd/blueray disks. Nominally it costs $50 but a free 'beta' key is posted on the forums once a month that allows it to be used for free indefinitely.