“Open Educational Resources are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and repurposing by others. OER include full courses, course materials, modules, textbooks, streaming videos, tests, software, and any other tools, materials, or techniques used to support access to knowledge.” -- Hewlett Foundation
Open content uses free license that grant users permission to:
Retain - Make, own, and control
Reuse - Use the content in a wide range of ways
Revise - Adapt, adjust, customize, or alter the content
Remix - Combine original or revised content with other material to create something new
Redistribute - Share copies of the original content, your revisions or remixes