In the Open Access environment, authors generally publish under the Creative Commons Attribution License which allows for free and immediate access to, and unrestricted re-use of, original works of all types. Under this license, authors make their scholarly content legally available for re-use, without permission or fees, and for virtually any purpose. Anyone may copy, distribute, or re-use these articles, with the condition that the author(s) and original source are properly cited.
See: What is Open Access? on the Library website.