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While the Green Route to open access publishing (also known as self-archiving) permits the unfettered distribution of research without tolls, copyright is still generally retained by the publisher. It may make sense to negotiate an author addendum with the publisher in order for the author to retain specific rights. For example, an author may wish seek to retain specific rights related to sharing and republishing. The resources list at the bottom of this page lists a number of sources for author addendums.
Many Open Access publications are released to the public under a Creative Commons license in which copyright is retained by the creator(s) of the work(s). When applying a Creative Commons license to a work, authors must be sure to choose one of the six licenses carefully. Similarly, users of material licensed under a Creative Commons license must be sure that that have understood the attached license before re-using the material.
Further examples of author addenda are available on the internet.