Either download DVD Decrypter or AnyDVD. These are programs that take off the copy-protection of the DVD. Which Nero Recode2 dosent have that function.
You will have to rip the DVD to your hard drive with DVD Decrypter then load the DVD into Nero Recode2 off your Hard drive. DVD Decrypter is free and you can get it off this site if you click the software tab at the top of the page.
Or you can use AnyDVD which you just run in the background. No need to rip the DVD to your HardDrive. This has a 30 day trial period. After the 30 days I think it is like $30 to buy. You can get that at the below site.