Last year, a report from the Entertainment Software Association of Canada claimed that a whopping one-fifth of computer games in the US and Canada were pirated. It was just the latest in a series of assertions from the industry that file sharing is losing them billions of dollars.

Figures such as this, though, are heavily disputed – and now a group of university researchers says they’re plain wrong.

“First and foremost, [peer-to-peer] P2P game piracy is extraordinarily prevalent and geographically distributed,” says Anders Drachen of Aalborg University and Northeastern University. “However, the numbers in our investigation sugget that previously reported magnitudes in game piracy are too high.”