DVDregionfree is not updated to support corrupt disc structures that sony has used on open season.

Please use DVDFab decrypter ( can be found at the top of the forum ) and you will be able to copy the disc without a problem.

Or if you are wild and crazy and feeling that you have a few bucks to spare go with DVD Fab gold or Platinum and you can retire Shrink that is no longer updated ( but still a very good program for older discs ).