Let's be honest: Warner Bros. wouldn't want the entire film leaked. However, Harry Potter is a cash cow, and the first 36 minutes would only serve to whet appetites. That sort of thing could actually prove beneficial, instead. However, Warner Bros. was quick to deny that sort of idea with the following statement.
“Last night a portion of Harry Potter and the Deathly Hallows: Part 1 was stolen and illegally posted on the internet. This constitutes a serious breach of copyright violation and theft of Warner Bros. property. We are working actively to restrict and/or remove copies that may be available. Also, we are vigorously investigating this matter and will prosecute those involved to the full extent of the law.”The footage appears to come from a DVD screener sent out by the studio, with all the watermarks typical of such a release. Usually those aren't partial releases.
At any rate, Harry Potter and the Deathly Hallows, Part 1, is sure to be a hit. It premieres later this week, at 12AM midnight Friday morning in some theaters.
You can watch the trailer below, and you can pick up the first 36 minutes on your BitTorrent site of choice.