Yeah DVD Decrypter works OK for DVDs still, but actually the one I like now is MakeMKV which is free and does Blu-rays too. It works well for me. You can use Handbrake to encode the MKV file into MP4 to reduce the size.
You will find out that DVD Decrypter won't work for most newer movies, its been that way for years already. Was a good program before they changed the encryption.