Some uninvited guests showed up at Kim Dotcom's mansion outside Auckland, on Friday: the police, in two helicopters. They had an arrest warrant for Dotcom, 37, who was born Kim Schmitz and is accused by US authorities with criminal copyright infringement through the website Megaupload, which he founded. Finding their target was not easy. When Dotcom, who holds Finnish and German citizenship, first saw the police, he ran inside and activated several electronic locks, part of the estate's sophisticated security system. As the police made their way through those, he barricaded himself in a safe room. Officers cut their way through to get him, standing near a firearm that they said looked like a sawed-off shotgun