Judy Ganson
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Open access generally refers to free online access to scholarly materials without restrictions. Free access is usually possible because authors self-archive their scholarly material or provide access to them through an institutional repository, they publish their articles in open access journals or they pay to make their articles open. Some high impact journals such as the Public Library of Science titles (i.e., PLoS Biology, PloS Medicine, etc.) provide articles free of charge while others like the Proceedings of the National Academy of Sciences offer articles free of charge after a 6 month embargo period.
Open Access Explained gives a quick overview of why Open Access is important for students and researchers worldwide.
For more information see Suber, Peter. A Very Brief Introduction to Open Access. 2004.
There are three types of Open Access Journals:
Consult the Publishers with Paid Options for Open Access through SHERPA/RoMEO.
Articles that may be self-archived in repositories:
If authors have signed a Copyright Transfer Agreement, the publisher's policy will determine which of these versions of an article can be archived in a repository.
SHERPA/RoMEO is a database of publisher copyright policies and self-archiving information that authors can use to check which version they may be allowed to archive. Not all journals are in SHERPA/RoMEO and it isn't always current, so authors may also want to check the publisher's website.
Authors are advised to check their Copyright Transfer Agreement when in doubt.