This document discusses open business models in the publishing industry. It describes how distribution of physical goods like books, music, and videos has come under threat from digital distribution. Industries like music, video, and newspapers have been "disrupted." The traditional academic publishing and textbook industry is also facing disruption from open educational resources and open textbooks. Models discussed include open licensing of content, collaborative authoring platforms like Curriki, and the "Flatworld Knowledge" model of offering open textbooks and optional study aids to generate revenue.