According to TorrentFreak, just be a politician, work for the army, or maybe the police.

What seems to have happened is that the ham-fisted attempts by the adult film industry to mass-sue their customers for downloading porn torrents has revealed some interesting things about who does and who does not get sued. The process is a familiar one - the entity owning the rights to the material sues a bunch of IP addresses that have been spotted downloading it. Various legal machinations are then engaged to associate IP addresses with names, and the names thus associated become the new targets.

Except when they don't. If an IP address seems to be associated with "public figures" or servicepeople overseas those names are quietly dropped. Sometimes IP addresses come back associated with cops or dead people and they don't show up, either.

Of course, nothing in the law requires that a copyright holder sue everyone equally. The exclusion of certain groups from these mass lawsuits is a separate matter from the inherent silliness of the whole process. But it sure would be interesting to know which politicians and other public figures are being given a free pass on their porn torrents...