The book is split in three parts, and broadly speaking the purpose of each section is as follows. Part 1 provides the analytic basis for social / nonmarket means of production; part 2 explores normative conceptions of freedom as they relate to emerging modalities of economic production and social communication; and part 3 catalogs various policy responses to the ways in which technology is fundamentally changing how humans interact and transact.
Stylistically, the book is incredibly, painstakingly dense. It was a thoroughly unenjoyable slog to get through all 500 pages.
The substance of the content is more redeeming, though not by very much. To Benkler's credit, the book does a phenomenal job articulating the analytic basis for nonmarket incentives (in an era when free market capitalism is the hammer that makes every problem look a nail) and what ought to be common-sense normative arguments for the freedom and distribution of information. Written in 2004, Benkler's book was far ahead of his time; Facebook was founded in 2004 and the blockchain hype of 2017 highlighted the transformative potential of decentralized, open-source technologies.
However, the vision of the future described in the book is comically techno-utopian. As the geopolitics that began in 2016 have shown, the Internet and its communication technologies have not in fact led to a more open and equitable society. Fake news abounds as foreign governments use social media to threaten the foundations of democracy itself. Distributed technologies have not displaced leviathan firms in cultural and economic dominance; rather, they have increasingly shifted wealth towards the few who can leverage these technologies for their own gain. Disappointingly, these firms have also shown themselves to be poor stewards of personal data and privacy.
Despite the optimism, Benkler was right about one thing. A better future is not inevitable, and is largely society's responsibility to understand and deploy these technologies conscientiously, and hopefully in ways that enable collective flourishing.