My opinion on this leak that's going viral
I personally feel like if the theory of Marvel having four different trailers or teasers attached to Avatars screening is true, then the teaser that is going viral right now was done purposely to see who is willing to leak important information out. It's a way to hype the movie up it's a way to hype Avatar up but it's also a way to find and punish the person(s) who leaked this. This is Disney that we're talking about. If you leak this from a movie theater they're going to figure out everything and they'll probably track it down to someone that works in the actual industry. Just my opinion.
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It's not hard.
Theater media and the screeners for the Oscars all have an ID encoded in the first few minutes of the movie. It's a pattern of "artifacts" that most people assume is a blip off in one corner of the media, but it's actually an ID that correlates to a specific theater/recipient in the studio's database.