This document summarizes a presentation given at the CC Global Summit on April 30, 2017 about adapting open educational resources. The presentation discusses challenges faced in the BC Open Textbook Project, which involved creating and adapting open textbooks for use in British Columbia. Initial challenges included assumptions that open textbooks only contained openly licensed material, that faculty understood open licensing and technology, and that adapting textbooks would be easier than creating new ones. Subsequent phases brought challenges relating to content, time constraints, file formats, technology skills, and licensing issues. The presentation provides examples of discussion topics groups addressed around challenges of adapting open resources, such as understanding open licenses, selecting authoring platforms, finding resources and support, and determining the scope of adaptations.