Hello, gmisz88.
You seem to need info about the two most popular Mac DVD "ripping" applications, about what is ripping, and about region codes. Search online for these terms, particularly in wikipedia. Here's a rough explanation:
Region codes are related to geographic areas. They are suggested (not absolutely required by law) by the motion picture exhibitors. A movie house (cinema, theater, whatever) wants to sell tickets. The film industry has complex schedules for releasing movies in various countries. Never mind why. That means they want to protect the exhibitors from someone in Japan or Korea selling DVDs online or to tourists who will take the DVD back to the U.S. / Canada while the movie is still showing at film houses in the U.S. / Canada. Many people want the movie experience A.S.A.P. after it is released. They will not wait one or two months for the DVD. But many of those same people will buy the DVD if it is immediately available. Region codes limit this country swapping of DVDs. You can change the region code only four times (many people say five, but it is five codes starting with the first one, so four changes). Ways to overcome that? Yes, but for the geeks out there; not so easy.
Ripping is slang for extracting data from a commercial disc and saving it in some altered form. Technically, iTunes rips music data from commercial CDs and saves it in the form of track files (Lovelysong.mp3 or whatever). MacTheRipper (gone? no site found) can make a DVD image of a commercial DVD with a variety of changes. That leaves you with a disk image that can be played just like a DVD using Apple's DVD Player, VLC (ugh!), or any of a dozen other applications. If you burn that image to a blank DVD, you can play it in a "set top" DVD player as well. In fact, iDVD (part of the Apple iLife suite) can do many of the same changes and either save a disk image or burn a DVD without even saving an image. Handbrake can extract a video file from a DVD. That means you loose the menu and chapters (navigational aids) and end up with a single movie file, such as "The Graduate.MP4" or "The Graduate.AVI". You can burn that to a CD (if there is enough room) or to a DVD. It won't play automatically in a DVD application or in a set top box, but you can play it in QuickTime Player, Windows Media Player, RealPlayer, etc., if you have the proper codecs installed. Menu and chapters can be reconstructed with some time involved using iMovie and iDVD. You might even like to change the chapter positions or add different music to play when viewing the menu.
Some people think they need MacTheRipper even if they only need to make copies of DVDs. You can copy any CD or DVD on a modern Mac using Disk Utility. Search the Disk Utility Help for "copy dvd". Disadvantage: Disk Utility copies everything exactly, including the region code bit-- unless you know the secret to omitting that bit.