Economics researchers at Wellesley College and U Minnesota have published a study showing that feature films’ US box office returns are not correlated to BitTorrent sharing. They also show that shorter delays between the US exhibition and overseas releases result in less file-sharing — that is, people outside the US download movies because they can’t buy tickets to them.
The second point is an important one. There’s only one Internet, networked culture doesn’t respect national boundaries. A particularly effective marketing campaign for a new release in America will stimulate demand in other countries, and if there’s no legitimate way to fulfill demand, then some portion of viewers will choose illegitimate routes. For example, the new Muppets movie has only just been released in the UK, some months after the US theatrical release (which was attended by enormous publicity). Presumably, someone at a studio concluded that there were too many UK movies in the pipeline at Christmas and not enough in February, and chose to delay the film’s release to now. However, a certain portion of the audience for Muppet movies have been reading reviews, watching viral YouTube clips, and sitting through extended online discussions of the movie without being able to see it and participate. I’m pretty sure that a lot of these people downloaded the movie so that they could be a part of this moment.
“Anti-piracy” efforts are often painted as life-or-death struggles for the studios. But in the case of international windows, this is about profit maximization, not survival. If the studios can outsource the titanic expense of policing copyrights in delayed-release nations to the countries themselves, they can wring a few more points of profit by delaying release to an otherwise optimum moment. But considered as a societal problem, it makes no sense to spend a million euros on copyright enforcement just so Disney can save a few thousand euros on the cost of making new 35mm prints.