There are many types of open access, perhaps because it is such a young movement that it's still developing standards. That said, there are three basic types:
Though green open access generally refers to the post-print of an article, there are three basic version types that can be self archived in repositories:
If authors have signed a Copyright Transfer Agreement (CTA), publisher's policy will determine which version of an article can be archived in a repository. Most publishers allow some sort of green open access. Authors can check their CTA for this information. 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 as well.
When Is Open Access Not Open Access? is an editorial by Catriona J MacCallum
MacCallum CJ (2007) When Is Open Access Not Open Access? PLoS Biol 5(10): e285. doi:10.1371/journal.pbio.0050285
Browse the SHERPA/RoMEO List of Publishers and filter to the Green, Blue, Yellow, and White categories
Check Beall's List (archived) of potential predatory journals, or see if the journal or publisher is listed in the DOAJ or DOAB.
Adapted from: Miller, E., & DeBerg, J. (2017). The Perils of Predatory Publishing: Views and Advice from an Editor and a Health Sciences Librarian. Pain management nursing : official journal of the American Society of Pain Management Nurses, 18(6), 351–352. https://doi-org.uc.idm.oclc.org/10.1016/j.pmn.2017.10.003
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