Lawrence Lessig just launched Code version 2.0 today and best of all he released it under a Creative Commons Attribution-ShareAlike 2.5 License.
So Code v2 is officially launched today. Some may remember Code and Other Laws of Cyberspace, published in 1999. Code v2 is a revision to that book — not so much a new book, as a translation of (in Internet time) a very old book. Part of the update was done on a Wiki. The Wiki was governed by a Creative Commons Attribution-ShareAlike license. So too is Code v2.
Thus, at http://codev2.cc, you can download the book. Soon, you can update it further (we're still moving it into a new wiki). You can also learn a bit more about the history of the book, and aim of the revision. And finally, there are links to buy the book — more cheaply than you likely can print it yourself.
Lessig is already asking for remixes, which is great because I'm certainly going to convert it so it works on my phone soon.