I would recommend not downloading DVD Decrypter as the developer was ordered to cease development and distribution.   I would also uncheck the automatic update option within the program if you do already have it.   There are other programs available that continue where DVD Decrypter left off. 

"Since the domain dvddecrypter.com was turned over to the company that issued the cease and desist order, I strongly suggest that if you are using DVD Decrypter, go into the settings, click on the Events tab and uncheck "Check For Program Update" at your earliest convenience as the current owner might collect IP addresses for nasty purposes."