Atviroji prieiga prie mokslo publikacijų ir duomenų (angl. Open Access) (toliau – atviroji prieiga) – nemokama ir nevaržoma prieiga internete prie mokslinių publikacijų, tyrimų duomenų ir kitos publikuotos bei nepublikuotos kokybiškos recenzuotos mokslinių tyrimų medžiagos, kurią kiekvienas vartotojas gali laisvai skaityti, kopijuoti ir atlikti automatizuotą turinio analizę nepažeisdamas autorinių teisių.

Open access repository (hereinafter – repository) is a technical infrastructure for storing and making available scientific publications, and/or related or separately submitted research data, together with metadata. Repositories can be national, institutional, single-subject or specialised, and are widely recognised by the academic community in their field.

Open access journals are electronic scholarly journals where all articles are peer-reviewed and openly available on the internet at no extra cost for the user. The user may create derivative works based on these articles, if it is allowed by the Creative Commons licences (CC-BY).

Data is the results generated and/or produced by research, which may be made available and accessible together with the underlying publications, or stored in repositories to which access is provided by the institution managing the repository. Data must have an identifier and metadata.

Data governance plan is a project’s data collection, storage and accessibility document, which states what will be done during and after the project to ensure that the data is stored safely and securely; how and under what conditions it will be made available for re-use, unless there are conflicting legal, ethical or security reasons; when and how it will be made accessible to other users; what standard metadata will be used to describe it; how the resulting data will be managed and updated; which data will be intended for long-term and which for short-term storage, in the latter case indicating when and how the data will be deleted.

An identifier is a unique and persistent digital object identifier that is used to identify a piece of scientific information in digital space.

The embargo period is the period between the publication of the scientific results (usually a publication) and the time when the publisher allows the published text to be made available in a repository or otherwise made open access.

Hybrid journals are scholarly journals that provide open access only to individual articles for which the authors or their funding bodies have paid the publishing costs, and access to the rest of the articles is only available to subscribers for a subscription fee.