Free Culture by Lawrence Lessig. The ending is a bit ranty and boring but the first 4/5 is an amazing summery of how copyrights have been used and abused historically, and it explores the point of copyright. I'd give the first part of the book 10 och of 10 but the ending a 4. Even if you don't agree with his conclusions, it's still a very good book to have read. I finished it in a day over the holidays, so it's not a heavy book.