Peer-to-peer file sharing
The United States' Motion Picture Association of America said that American studios lost just over $2.373 billion to Internet piracy in 2005. That was about one third of the total cost of movie piracy in the United States. The estimate from the MPAA was doubted by commentators. It was based under the assumption that one download was the equivalent of one lost sale. Downloaders might not buy the movie if downloading was an option.