*hint* You're new here, so I'm gonna give you a clue.......nobody here is gonna tell you how to beat copyright laws :?
I will throw you a bone, however......here in Canada it's not illegal to make BACKUP copies of movies you buy (that are copywritten). So theoretically, I can make a backup of a movie in case my toddler gets a hold of the original and breaks it.
And in order to make a BACKUP copy, I can use just about any DVD burner I want. DVD-R's seems to be the most compatible as well. However, it's not the burner that makes the difference.....it's the software used to make the backup.
So, I'll answer your question in part: you can use any DVD burner to make BACKUP copies of legitimately-purchased DVD movies. And DVD-R's seem to work the best in my experience. But you need the proper software to make those BACKUPS.
I'm not sure of the laws in the States though, but BACKUPS here are ok to do.