Best = AnyDVD to remove copy protection, then Nero Recode2 or Shrink to pick features and size. Burn with Nero.
sometimes dvdshrink or dvddecrypter won't encode if there's a mean scratch on the disc (not always visible); u might even get a 'copy protection' or 'data redundancy' error. just use one of those scratch removal machines (normally found at video shops) & the disc'll work like new!