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No there are genuine leaks. Pete Hines and Todd Howard both have said on Twitter and in interviews that all videos containing spoilers will be subject to copyright claim. Hell even the Fallout Sub Reddit is forbidding the posting of ANY spoilers or videos. This is an example of when early copies get out and the Dev DOESN'T want that kind of info out there.
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Yeah, sometimes leaks are genuine. You also mention subject, which is key. Developers/Publishers at times will claim copyright if anyone leaks anything [I]they[/I] don't want leaked.