Tim Wu of Slate Magazine writes about the lack of Sundance film festival movies on popular bit-torrent sites.

Film piracy, the conventional wisdom goes, is a threat to the film industry at all levels. That’s certainly the sense at the Sundance Film Festival, where both the festival and distributors invest heavily in anti-piracy measures, including undercover agents who attend screenings to capture illicit videotapers. But it turns out that they may be wasting their money. Sundance films, present and past, simply do not register in the online pirate world—unless they are one of the few that have already made it big (like Clerks or Little Miss Sunshine). This proves two things: When it comes to content piracy, obscurity, not security, is the best defense. It also demonstrates that movie pirates are fundamentally parasitic, not predatory.

Movie piracy is a $18.2 billion market.