This law school casebook starts from the premise that cyberlaw is not simply a set of legal rules governing online interaction, but a lens through which to re-examine general problems of policy, jurisprudence, and culture. The book goes beyond simply plugging Internet-related cases into a series of doctrinal categories, instead emphasizing conceptual issues that extend across the spectrum of cyberspace legal dilemmas. While the book addresses all of the "traditional" subject matter areas of cyberlaw, it asks readers to consider both how traditional legal doctrines can be applied to cyberspace conduct, and how the special problems encountered in that application can teach us something about those traditional legal doctrines. The fifth edition has been updated, shortened, and reconceptualized to make the book even more effective as a teaching tool and to illuminate new debates at the heart of this evolving field. The book groups the material into units addressing the who, how, and what of governance/regulation--fundamental questions that pertain to any legal system, in cyberspace or elsewhere. The fifth edition also includes updated treatment throughout, as well as a more stream-lined approach that should make an already effective casebook even more unified and teachable.