I normally use DVD Decrypter and then DVD Shrink on the PC to backup the kid’s DVDs which are constantly getting trashed. For Mac OS X, the solutions seem to be “Mac The Ripper”:http://mactheripper.org and then to burn the copy, you can use the included iDVD to get a dual layer onto a single layer or you can use “Burn OSX”:http://burn-osx.sourceforge.net/
You can also check “Rip Different”:http://www.ripdifferent.com/ as a good overall source of information
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