The aim of Open Access is to make scientific literature and materials freely available to all users, free of charge and as free as possible from technical and legal barriers. An essential aspect is to maximise the dissemination of scientific information.
The use of institutional and disciplinary repositories to make openly available a second publication of a work published by a publisher or journal corresponds to the green road of Open Access (also self-archiving). The options for this are regulated in the clauses on copyrights and licences when a publishing contract is concluded. The legal situation is simpler if repositories are used for the primary publication of scientific and scholarly works in the sense of the golden road of Open Access, for example for the publication of conference proceedings, series of publications or other texts that are not published in parallel by a publisher.