Point about Identity in Cyberspace

Reading Lawrence Lessig's "Code Version 2.0." There's a good point about identity on the Internet. "While in real space...anonymity has to be created, in cyberspace anonymity is the given." On the Internet your identity is built from the IP address up. What you add to your IP adds to the picture of your identity. Of course, the main point of the book is that commerce, the law, and government have created an architecture of the Internet that prevents you from accessing many, if not most, spaces without significant creditials that certify who you are.