Learn more by reading a book or an e-book, or try one of these databases that specialize in open access content:
Here are two documents designed to answer educator's questions about using copyrighted material in their own OER resources or in OA texts they're adapting:
Using Copyrighted Content within Open Education Resources: This abbreviated tool is intended to help OER champions readily navigate how and when to appropriately include Copyrighted materials in open educational resources. Written by the WTCS OER Network.
Code of Best Practices in Fair Use for Open Educational Resources: This lengthy code is a tool for educators, librarians, and authors to evaluate common professional scenarios in which fair use can enable them to incorporate inserts, including those protected by copyright, to create OER. Written by the CMSI Center for Media and Social Impact.
Finding images licensed for re-use has become easier. Here are some sites to explore: