Anyone can register them. Network Solutions and GoDaddy both use the same proxy person in Germany. I haven't heard a definitive answer on how to transfer the domains though (in case of resale). I have a few and will try to develop them into income sites as they don't generate anything in parking. If you look at the sedo.de website you will see that many English words get a lot of offers and sell for big dollars but they are German to German sales.