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Warner created a "chain of custody" to track who had access to the film at any moment. It varied the shipping and delivery methods, staggering the delivery of film reels, so the entire movie wouldn't arrive at multiplexes in one shipment, in order to reduce risk of an entire copy being lost or stolen. It conducted spot checks of hundreds of theaters domestically and abroad, to ensure that illegal camcording wasn't taking place. It even handed out night-vision goggles to exhibitors in Australia, where the film opened two days before its U.S. launch, to scan the audience for the telltale infrared signal of a camcorder.
http://www.latimes.com/business/la-fi-darkknight28-2008jul28,0,22 ...

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Warner Bros. executives said the extra vigilance paid off, helping to prevent camcorded copies of the reported $180-million film from reaching Internet file-sharing sites for about 38 hours. Although that doesn't sound like much progress, it was enough time to keep bootleg DVDs off the streets as the film racked up a record-breaking $158.4 million on opening weekend. The movie has now taken in more than $300 million.

The success of an anti-piracy campaign is measured in the number of hours it buys before the digital dam breaks.