No, offline service doesn't mean "capturing" movies from Netflix. It just mean you're able to watch movies without an internet connection but you're still on their plattform. When you really want to capture movies/series, you'll need a third party software. Just Try Audials Moviebox
 http://record-streaming.com/en/netflix . It's totally legal as long as you keep the movies in your own use. 
I hope this will help