Is it Possible

A friend of mine has lent me a few "backed up" wii games to try on my softmodded wii.
He told me that it is NOT possible to copy the backed up dvd to another dvd (copy backed up game using a dvd copier) as the data is reverse written or something like that.
Will it work or wont it? Has anyone tried it?
If i had a spare blank dvd right now id try it but i dont.

many thx in advance