Netflix removed the six device limit some time ago. You're still limited to two streams (though Netflix offers a four stream plan now for a little bit more money).
And Netflix doesn't care if people share streaming subscription plans.
(Netflix cared, a little, when libraries were using a DVD subscription to offer their patrons movies -- and given that the incremental cost to ship a DVD was way higher than the incremental cost to stream a movie, this sort of makes sense -- but still didn't do anything to even contact libraries that were public about doing this and ask them to stop. See http://chronicle.com/blogs/wiredcampus/academic-libraries-add-netflix-subscriptions/27018 for more info)