Relationship between OA and OER
Open Access permits the 5Rs of OER to flourish.
It encourages and promotes sharing of information, reuse, and remixing of these works. It allows the OER to be adapted for a specific locality, and translated into different languages, or updated with ease, when new discoveries are made.
Open means that there is no gated access sometimes called Faux -pen access, where you need to log in, and give up some personal data, in exchange for access. In faux-pen access, resources though free to read, may be copyrighted or have restrictive terms of use that don't allow for re-use and sharing. The internet enables sharing; Copyright forbids it. Open access gives permission to share.
Like OER, Open access promotes the ethical use of information. Unless, given to the Public Domain, where no stipulations are made, attribution is requested in the most open of licenses to show the originator of the work. Creative Commons most permissive 4 licecenses ( that is Not the ND licdenses) show educators that the material held their can be used and adapted without fear of breaking copyright. It just makes it easier, when you know exactly what you are dealing with. It takes the guess work out of the equation.