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According to TorrentFreak, some users on Reddit noticed that when placing a preorder for the well-received Thor: Ragnarok with Vudu, the movie showed up as immediately available on iTunes. Somewhere along the line, Vudu and iTunes mixed up the handshake on the release date, and iTunes seemed to think that customers had rights to watch the film right away instead of waiting another month. The movie could be streamed as well as downloaded in full for offline viewing. And as you might guess, it took very little time for a flawless, 720p version of the digital release to find its way onto the internet. Once iTunes’ DRM protections were stripped away and it was shared, the movie spread like wildfire. Higher resolutions (including 1080p) may also be out there.
From The Verge: