This document defines and discusses open access publishing. It explains that open access literature is digital, online, free to access, and free of most copyright and licensing restrictions. There are two primary models for open access - open access archives/repositories which make unpublished or published works freely available, and open access journals which peer review works and make them freely available. The document discusses factors like author processing fees and subsidies that support open access journals' business models. It also defines terms like green open access (self-archiving) versus gold open access (publication in an open access journal) and addresses issues like predatory journals.
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