I would not regard this as illegal provided you purchased and still own the the original DVD and you are copying it for your own home use and not for re-sale or to give to someone else.
Shadorne (System | Reviews | Threads | Answers)
A little sidebar perhaps, but why would anyone make a copy of a DVD if it was intended for their own home use, and not intended to be given to someone else or sold? This strikes me as a legal loophole to protect those who duplicate copyrighted material. Of what purpose are two identical versions of the same DVD in the same household?
If I'm not mistaken, the original intent of this loophole was to allow archiving of recordings that were in danger of being damaged if they were handled or played.
With the advent of CDs and DVDs, this potential for damage has largely disappeared.
Sure, there will be some examples offered: protect the original from damage, provide a second copy for the rumpus room. I'll bet all the explanations stretch credulity.