Mac the ripper is fairly slow at ripping DVDs, and also does not rip them as a disk image. If you use VLC and Fairmount to mount your dvd, then open Disk Utility to creat a disk image it is faster and easier than MacTheRipper (in my experience). After this you have a fully decrypted dvd image in which you may do as you wish with. 
VLC (Free)
Fairmount (Free)
Disk Utility is on your mac
VLC (Free)
Fairmount (Free)
Disk Utility is on your mac