DVD decrypter failing a proper rip probably means that a new protection ( ArcCos or whatever) kicks in. In that case the best free solution is DVDFab decrypter, which manages more protections than DVD decrypter.
I m using DVDFAB 2.89 Platium(GoldMode) and when it is done with the movie..the screen have the square on it. sometime it is clear but most of time it have the square on it. Then, I use DVDcopy tool, it copy all for me ..I can use it to burn only one movie on DVD. When I try to use DVD2One for that file.. the DVD2one still report that my movie still have copyguard. What is going on? are anyway to bypass it? Thanks