Hybrid journals are subscription journals that charge an extra fee to make a specific article Open Access while the remainder of the journal remains behind a paywall. This type of Gold Open Access is always accompanied by a fee.
Making a version of work (usually an AAM) available in an open access repository. These can be institutional such as the Cambridge Repository or subject based, such as arXiv, PubMed Central, RePEc or SSRN. Placing work in ResearchGate or Academia.edu is not considered to be green open access. Green Open Access can be considered to be ‘secondary Open Access’.
Open access at the time of publication. Gold Open Access can be considered to be ‘born Open Access’. Fully Open Access journals often (but not always) charge a fee for publication.
The author’s final, peer reviewed and corrected manuscript, usually created in Word or LaTeX. When publishers require authors to upload their final manuscript into a formatted page, this document is considered to be the Author Accepted Manuscript (AAM) as it is distinguishable from the final published version because page numbers, volume and issue number are absent.
Article Processing Charge (APC) – a fee charged to the author, creator, or institution to cover the cost of an article, rather than charging the potential reader of the article. APCs may apply to both commercial and Open Access publications. APCs are sometimes charged to authors in order to cover the cost of publishing and disseminating an article in an Open Access scholarly journal.