What format do you wish to have as the final result? If all you want is dvd-video, you can do a straight rip to the hard drive using the builit-in ripper of AnyDVD, or use DVDDecryter with AnyDVD running in the background. This will give you the full movie, and it probably won't fit onto a single layer dvd, since most commercial movies are much larger.
If you need to do compression, use DVDShrink or Nero Recode to reduce the ripped files down to size necessary to fit onto a single layer dvd. You can select the main movie if you like using these tools, or compress the whole thing. You can also use these tools with AnyDVD in the background and do the ripping and compression in one step if you like.
If you want just the main movie, and need mpeg2 files, start AnyDVD, then use Vob2Mpg to convert the vob files in your dvd over to one large mpeg2 file. Dvd-video has mpeg2 in vob container files...this program just removes them without encoding or manipulating them in any way, so there is no loss of quality. Mpeg2 files by themselves won't play on a stand alone dvd player, but it is sometimes helpful to have them joined together if you are going to convert to avi or mpg4.
So, I'm back to my original question. What format are you trying to go to?