OK, Nox uses safedisc 1 as its protection scheme whilst Diablo 2 uses securom new.
Forget about using nero to copy either of them.
Try downloading the trial version of alcohol 120% and use that to make your copies using safedisc 1 settings for Nox and securom new (not securom new 4.x) settings for Diablo 2.
[li]You'll get lots of read errors and the reading process will initially be quite slow when reading Nox as there will be hundreds of read errors in the first ~10,500 sectors. Don't worry about. Just be patient. When it's finished the first ~10,500 secyors it will read the rest of the cd in only a couple of minutes.
[/li][li]To play your copy of diablo 2, you'll need to enable Ignore media type in alcohol's emulation options since you only have a writer.