If they're exact copies with no removal of extras & no compression then Nero is not the way as mostly you're talking about using dual layer media.
Get DVD Decrypter & rip the disc to an ISO image file - you must be using NTFS as the file system for this - and then burn that image file to the DL media using ImgBurn. Both these can be found with a simple google search.
If the original will fit on a single layer disc then the same process should be followed.
Verbatim is the only DL media worth using.
I didn't know there was a free copy of AnyDVD , there is a 30day trial.