Does Movie Piracy Actually Increase Movie Revenues?

Does illegal file sharing of movie content actually increase movie box office revenues? One study suggests that might actually be true, though the magnitude of the revenue lift might be tough to determine. 

Researchers say the illegal file-sharing spreads information about content that encourages some users to pay, when they might not otherwise have done so. Content owners won't be impressed, as the self evident fact is that piracy does drive significant revenue loss. 

In fact, piracy affects many industries. In this one example, the revenues in red represent estimated losses because of piracy.