Open books are books that are freely and legally available online. There are some differences between the types of open books available which are explained below. The following sections indicate some of the search engines and repositories available to search for different types of open books.
Open Access Books
Open access books are published through open access and are freely available online.
Open textbooks are books published with open licenses and can be distributed, adapted and revised by the end user as well as being freely available online.
Books in the public domain
Books in the public domain are books that are out of copyright. Many of these have been digitized and are freely accessible online.