By encoded discs do you mean copyprotected, if so d/l free 21 day trial of AnyDVD which is available at slysoft web site, this will remove any encryption and allow you to back up the original DVD.
If I understand correctly, Anydvd (shareware), DVD 43 (freeware) and DVD Decryptor (freeware) up until it ceased being supported are 3 programs I know of that will remove DVD encryption. Anydvd is the one that I see recommended the most.
DVDDecrypter is no longer being updated so cannot handle some of the newer encryptions so therefore I use AnyDVD which IS being updated regularly...I have no experience with DVD43
If you own AnyDVD then it's yours, along with updates until you become very old, if not then you have a 21 day free trial.. Cant help you with DVD43, try software section.