Due to the international nature of data networks, internet crime is a global phenomenon. The authority of national law enforcement agencies ends, however, at national and jurisdictional borders. As a result, as far as the presence of illegal content in cyberspace is concerned, national blockades of the Internet are attracting increasing interest as a possibly viable strategy to solve this problem. If direct action against illegal content on foreign servers is impossible, the attempt can at least be made to block citizens’ access to such content – if only from within a state’s own territory. This approach is technically problematic and, from a legal point of view, highly controversial.