The makers of Dallas Buyers Club have sued hundreds of BitTorrent users over the past year.

Many of these cases end up being settled for an undisclosed amount. This usually happens after the filmmakers obtain the identity of the Internet account holder believed to have pirated the movie.

Not all alleged downloaders are eager to pay up though. In fact, many don’t respond to the settlement letters they receive or claim that someone else must have downloaded the film using their connection.

In a recent court filing (pdf) at a Washington District Court the filmmakers explain the efforts they undertake to ensure that the right person is accused. This includes gathering information from Facebook, LinkedIn and even Google Maps.

“Google address mapping and county records were investigated to confirm ownership/rental status of and residence at the property associated with the IP address, as well as observe the physical makeup and layout of the house and neighborhood to anticipate possible claims that a wireless signal was highjacked by someone outside of the residence,” the filmmakers explain.

The router security settings and download history of a specific connection are used as additional pieces of information to ensure that the alleged copyright infringements are systematic.

“Further, given the standard security measures imposed by ISPs to prevent unauthorized use of an IP address, the volume of piracy demonstrated over the extended observation period could not be the result of someone driving by, a temporary house guest or a hacker sitting in a car on…

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