MacTheRipper is one of the best useful free DVD ripping program on Mac OS. MacTheRipper allows us to rip DVDs and pass to our hard drive.
Copying DVDs with MacTheRipper on a hard drive leaving them unprotected and region controls. Then we can burn our own DVDs or pass it to other formats.
Rip DVDs is a good measure to make backups of our DVDs and to avoid wear and have it always in the best conditions.
Update: If you use this program you to know that leaves a trace on your computer that you have ripped DVD's.
To prevent that info, stay there, there KILL THE RIPPER program that eliminates all this information hidden.