Download movies from internet or your DVD disc?
There is a instruction about how to download movie from DVD
To download free movies online onto computer, you could check out this guide about how to download torrent movies to computer freely.
Download your owned Movies from DVD to computer? all you need is a program that can rip/download DVD movies to computer.
Here are some free programs online:
Mac: mactheripper, Handbrake, etc.
Windows: DVDShrink, DVDFab, DVD Decrypter, SmartRipper, RipIt4Me...
If you need the step by step guide, you could try this easy Mac DVD converter guide about How to convert/rip DVD to QuickTime, iMovie, FCE, FCP, iPad, iPhone on Mac OS X in only 4 steps.
Step 1: Load DVD
Step 2: Edit DVD movie(Optional)
Step 3: Set output format and folder
Step 4: Convert DVD