Go on to a search engine i.e. Google and type in DVD Encrypter. This little program gets rid of the copyright so you can save it onto your hard drive then burn it to DVD.
DVDdecrypter will indeed remove that protection but there's a very good chance your disk won't fit on your blank disk. Mopst movies are on double-layered disks, and most dvd-burners can only deal with single layer disks. You'll need "DVD Shrink". It will shrink your original disk to fit on your blank. It's free to download. It and DVDdecrypter work well.