Download the free trial of AnyDVD:
If you wish to buy it afterwards, that would be a good decision.
Insert the DVD and launch AnyDVD, the protection will be broken and you will be free to copy it with your Nero.
You can copy your DVD (using Nero) like so;
From the Start Menu, go to All Programs > Burn a DVD or Data DVD > Nero Programs > Nero Express.
ChooseCopy Entire Disk from What Would You Like to Burn.
In the Select Source and Destination window, choose Maximum from the the writing speed pull down menu.
Press Copy to start. The system will scan the disk and start copying to the hard drive.
A dialog box will pop up; when complete it will ask for an empty disk to write to. Insert a blank writable or rewritable DVD in the recordable/rewritable DVD drive.
The box will close automatically, and the files from the original DVD will be copied on the blank DVD.
When the burning process is complete, a pop up window opens with the message: Burn process completed successfully. Click OK.
Click Next to choose more options or to exit.