"Open Access means access to information without financial, legal or technical barriers."
The most widely accepted and influential definition of open access integrates statements passed by the Budapest Open Access Initiative (2002), the Bethesda Statement on Open Access Publishing (2003), and the Berlin Declaration on Open Access to Knowledge in the Science and Humanities (2003). Together, they are referred to as the BBB Definition of open access, which stipulates provision of access to information without financial, legal, or technical barriers. Open access content can be made available through self-submission to open access repositories (green open access) or through open access journals (diamond and gold open access).

Caption: Venn diagram highlighting the different levels of open access in scholarly publishing, as a function of cost to the readers and authors, copyright retention, and peer review. Adapted from Farquharson, Jamie Ian (2018-07-31). "Introducing Volcanica: The first diamond open-access journal for volcanology". Volcanica 1 (1): i–ix. DOI:10.30909/vol.01.01.i-ix. ISSN 2610-3540.
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Scholarly Communications Toolkit. Association of College & Research Libraries.
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