The publishers’ complaint takes issue with the way the upstart produces its open-education textbooks, which Boundless bills as free substitutes for expensive printed material. To gain access to the digital alternatives, students select the traditional books assigned in their classes, and Boundless pulls content from an array of open-education sources to knit together a text that the company claims is as good as the designated book. The company calls this mapping of printed book to open material “alignment”—a tactic the complaint said creates a finished product that violates the publishers’ copyrights.