Author Addendum – An author addendum is a supplemental or added agreement to a publishing contract that defines or changes the terms of the contract, often focusing on the transfer of copyright ownership. For authors of scholarly works, an author addendum to a publisher’s standard publication contract may be necessary to help ensure that authors protect important rights, such as the right to post their articles online to a personal website or in a digital repository; the right to use their works within a classroom setting; or the right to use their works as the foundation for future research.
Libre OA – the paper is made available under an open licence, allowing it to be shared and reused, depending on which licence is used. (source) (Libre and Gratis refer to copyright and licensing restrictions)
Fostering an understanding of copyright law, licences and exceptions to empower humanity.