Ok, lemme get this straight. A German court is releasing to the public information on individuals who visited a US web site. There must be something missing in the translation.
Or, the court ordered the German ISP to release info about which of its customers appears in its logs as having visited that porn site. Never forget, your ISP knows who its subscribers are, and keeps logs of what sites were visited. Upon court order, it might even quietly record all traffic, each way.