This document discusses copyright and open licensing for educational materials. It defines what makes a textbook open (having an open license that allows free access, modification, and distribution) and where to find open textbooks online for free in both digital and print formats. It also covers other types of open educational resources. The document provides an overview of copyright, including what is and isn't protected, how long copyright lasts, registration, and works that are in the public domain. It discusses the concept of fair use and the guidelines for copying by instructors. It also covers attribution, works made for hire, and the different Creative Commons licenses.