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Table 2 Definition of access categories at the paper level

From: Knowledge sharing in global health research – the impact, uptake and cost of open access to scholarly literature

Category Definition Article processing fees Subscription fees Embargo
Gold OA article (no APC) Article published in gold OA journal website when published; instantly available on journal website when published No No No
Gold OA article (with APC) Article published in gold OA journal; instantly available on journal website when published Yes No No
Delayed OA article Free article published in delayed OA or subscription journal with delayed OA option No Yes Yes
Hybrid article Free article published in a subscription journal Yes Yes No
Green OA article Articles in subscription or hybrid journals which have been self-archived by the author or affiliated institution to provide free access No No No
Other free access Free article in subscription journal or journal for which the status is unknown Unknown Sometimes Sometimes
Toll access Article that can only be accessed through a subscription or pay-per-view model and has not been self-archived No Yes Yes
Paper status unknown Article for which the access status could not be determined Unknown Unknown Unknown
  1. APC article processing charge, OA open access