As discussed in Chapter 1, open educational resource (OER) documents and media are freely accessible and open to use. Therefore, it may seem counterintuitive to discuss copyright issues when considering OERs. Despite the free and open nature of OER, copyright still applies. Whether you are adapting or using the work of others or designing your own OERs, issues of copyright should be carefully considered. In this chapter, we provide some fundamental ideas to consider regarding copyright when creating, modifying, and using OERs.