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Re:Sony threatens to sue Twitter by pervycreeper on Tuesday December 23, 2014 @01:44PM (#8789491)
This seems to be the most glaring issue here, and likely the reason for the scare letter.

Probably unwise of them to have used this strategy considering the Streisand effect.

Re:Sony threatens to sue Twitter by shawn-butler on Tuesday December 23, 2014 @03:03PM (#8789909)
Again just speculating, but this could also elevate the dump of the documents on Twitter by the individual into a press issue now since it is showing wrongdoing.

Rights of journalist to distribute illegally obtained documents in public interest I think was firmly established by SCOTUS in BARTNICKI v. VOPPER [0] and they go over the DMCA implications in the opinion.

[0] http://scholar.google.com/scholar_case?case=2171346211086974...