An Article Processing Charge (APC) is a fee paid to publishers to publish an article or conference paper immediately open access. an equivalent charge for books is known as a Book Processing Charge (BPC).
A Data Access Statement (sometimes known as a Data Availability Statement) is a statement in the paper itself, or in the metadata about the paper. It informs readers whether and where the underlying research materials (e.g. data, software, images, manuscripts...) associated with a paper are available, and how they can be accessed. The statement can include links to the dataset, where applicable and appropriate.
An embargo period is a period during which a paper cannot be made Open Access. It does not usually stop you from depositing the paper to a repository and adding metadata, but the paper itself must remain closed access during the embargo period. Embargoes are often used by publishers to prevent an Author Accepted Manuscript from being made Open Access by self-archiving until a given period has elapsed. Increasingly, funders are refusing to accept as Open Access-compliant, papers that are embargoed beyond the publication date.
The Final Published Version (also known as the Version of Record) is the version of a paper that is published, following review, typesetting and editing.
Summarises basic information about the paper, e.g. author, date created, date modified, file size etc.
There is no one standard definition of what constitutes a predatory publisher but generally they are those publishers who charge a fee for the publication of material without providing the publication services an author would expect such as peer review and editing. Publishing with a predatory publisher can damage an author's reputation and contribute to the perpetuation of bad research.
Always check that the publisher/journal you want to publish with is legitimate. The website ThinkCheckSubmit outlines a set of helpful steps to do so.
Most legitimate Open Access journals are registered with the Directory of Open Access Journals (DOAJ).
A Rights Retention Statement (RRS) is a statement included in the acknowledgement section of a paper, and in the covering note to the publisher. It asserts the author's rights to the Author Accepted Manuscript of the paper. The exact wording required differs slightly between funders, but an example would be:
"This work was funded by [funder name] [grant number] For the purpose of Open Access the author has applied a CC BY public copyright licence to any Author Accepted Manuscript version arising from this submission"
The Research Excellence Framework (REF) is the UK's national programme for assessing institutions on their research quality. It took place in 2014 and 2021. The UK Government is currently reviewing its purpose and operation, and it is expected to be superseded by a new national research assessment programme to be announced in 2023.