Code and Other Laws of Cyberspace is a 1999 book by Lawrence Lessig on the structure and nature of regulation of the Internet.

[1] More generally, Lessig argues that there are actually four major regulators (Law, Norms, Market, Architecture) each of which has a profound impact on society and whose implications must be considered (sometimes called the "pathetic dot theory", after the "dot" that is constrained by these regulators.)

The importance of this side of the story is generally underestimated and, as the examples in the book show, very often, code is even (only) considered as an extra tool to fight against "unlimited copying."

The Future of Ideas is a continuation of Code's analysis of copyright, where Lessig argues that too much long term copyright protection hampers the creation of new ideas based on existing works, and advocates the importance of existing works entering the public domain quickly.

[4] The book has been widely cited, and Lessig has repeatedly achieved top places on lists of most-cited law school faculty.