All books listed in DOAB are freely accessible and therefore free to read, but this does not mean readers are free to do anything they like with these books. The usage rights of the books in DOAB are determined by the license.
The Mason OER Metafinder helps you find Open Educational Resources. Unlike other OER discovery sites (e.g, OER Commons, OASIS, MERLOT, OpenStax, etc.), OER Metafinder is not a single database. Instead it is a federated search across 21 different sources of open educational materials.