Citizens of states that are party to the Schengen agreement can travel to any Shengen country without a visa for three months at a time out of every six. I hav

Citizens of states that are party to the Schengen agreement can travel to any Shengen country without a visa for three months at a time out of every six. I have implicit Schengen status (US citizen) and as far as I know may travel within (Schengen) Europe without any particular permissions, certainly not from the Germany authorities, whoever they might be. In fact, spy agencies aside, the German authorities don't even know that I'm here. I got an entry stamp on my passport in Paris, and did nothing on arrival in Germany (TXL) other than collect my baggage and get a taxi. I'll get an exit stamp in Copenhagen on the way out.