This is a great little program. It's too bad that it is a demo, and you have to pay for the full application. With the Demo, you can still use it for what you downloaded it for. But with the full application, you get much more. I'm debating about buying the full app.
Use Mac The Ripper to rip the DVD onto your computer and to get rid of the CSS coding. Then use DVD2oneX 1.4.1 to shrink your DVD in order to fit it onto your 4.7GB DVD-r or DVD+r, whichever you might have. My Powerbook is DVD-r, so I suspect all others are as well. After you have shrunk it, use Toast OSX in order to burn your DVD onto a blank DVD. Toast is program that costs money, I don't believe that there are any demo's for it either. There are ways to get around this, ie. Limewire, Poisoned, etc.
When you're all done, you should have a proper "back-up" DVD for your collection. Just follow the steps.
**Note** make sure that you purchase the right burnable DVD's. Make note if you have a SuperDrive and also what format it is in, either DVD-r, or DVD+r.