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"SHERPA RoMEO is an online resource that aggregates and analyses publisher open access policies from around the world and provides summaries of self-archiving permissions and conditions of rights given to authors on a journal-by-journal basis."
-From SHERPARoMEO's "About" page
Where can I go to learn more about what rights I have over previously published articles?
If in doubt about whether you may publish your scholarship online, go to SHERPA/RoMEO, an international listing of publisher copyright policies, http://www.sherpa.ac.uk/romeo/. Each entry provides a summary of the publisher's policy, including what version of an article can be published or archived, where it can be deposited, and any conditions that are attached to that deposit.