Tracing the trajectory of culture and copyright through time, Lessig makes a compelling argument against our modern "permission culture" that copyright entails.
For a surprising amount of time Lessig laments on his failed strategy in Eldred v. Ashcroft. As he narrates his reasoning which led him to adopt his strategy the reader is probably sympathetic. There was no reasonably foreseeable error. The fact that hindsight shows his strategy was ineffective probably doesn't necessitate nearly fifty pages devoted to the telling of that story, but the book itself is still solid, very well written, and provides and excellent understanding of the intentions of copyright, and what's lead to our current implementation of it. After outlining the pitfalls of our current system, he offers functional alternatives to it.