Anything Goes : Preventing Script Leaks! What Would You Do? Quentin Tarantino's Script Was Leaked. by Merri Christi Pemberton

I just read an article today about how one of Quentin Tarantino's scripts were recently leaked. It was for another western movie he wanted to make called "The Hateful Eight". He gave the script to a few actors or representatives and one of them exposed it. Link: http://www.nbcnews.com/entertainment/quentin-tarantino-ditches-new-weste... . I would love to get everyone's points of view on how do you deal with keeping your scripts, and productions, private...or preventing important information about them getting out in the open? Is the "Non-Disclosure Agreement" good enough...or do you think another solution or an extra solution is appropriate? I put this question in the Pre-Production, because I really wanted to get feedback from not just screenwriters, but from filmmakers and producers as well.