One possible way to finance Gold Open Access where authors are to pay a processing charge per published article 
> At Freie Universität Berlin, the APCs can be reimbursed from the publication fund.

Free licensing models that clearly state how a publication can be shared and reused.

Articles are directly published in an open access journal / open access monograph that is freely available without subscription.

After publication with a traditional (closed) publisher, a copy of this previously published work/peer-reviewed article is deposited in an open access institutional or disciplinary repository.

According to the Berlin Declaration from 2003, open access publications must comply with the following:

"The author(s) and right holder(s) of such contributions grant(s) to all users a free, irrevocable, worldwide, right of access to, and a license to copy, use, distribute, transmit and display the work publicly and to make and distribute derivative works, in any digital medium for any responsible purpose, subject to proper attribution of authorship." ("Berlin Declaration on Open Access to Knowledge in the Sciences and Humanities")

Monographs and edited volumes that are freely available online (usually parallel to a print publication).

> Directory of Open Access Books.

Scholarly journals in which all articles are freely available online immediately upon publication.

> Directory of Open Access Journals.

Guidelines of an institution (e.g. a university) on how its members should or have to proceed in respect to open access publications.

> Open Access Policy of Freie Universität Berlin.

Freely accessible online database in which all deposited documents are available open access; an open access repository can be either institutional or discipline-specific.
> Information on Refubium, an institutional repository of Freie Universität Berlin.

A package of measures or a roadmap adopted by an institution in order to achieve specific objectives relating to open access

> Open Access Strategy of Freie Universität Berlin.

Software for publication and administration of open access journals.

> OJS service at Freie Universität Berlin.

A central funding source established, for example, at a univeristy to cover article processing charges.
>  Open Access Publication Fund at the Freie Universität Berlin.

A good open access journal, in the same way as good subscription-based journals, has transparent peer review processes; well-known researchers act as members of the academic editorial board; the journal publishes relevant research, provides persistent identification for the articles and is indexed in respective databases or catalogues (e.g. Web of Science, Scopus, ERIH PLUS). Open access journals that use strict quality assurance procedures can, for example, be found in the Directory of Open Access Journals.

Information on "Predatory Publishing" can be found here.

Scholarly contributions published in periodically appearing collections can, under certain conditions, be made available open access in an accepted manuscript version 12 months after the initial publication.

• Erläuterungen zum Zweitveröffentlichungsrecht der Allianz der Wissenschaftsorganisationen (in German)
• iRights.Lab Policy Paper Series Nr. 1: "Zweitveröffentlichungsrecht für Wissenschaftler: Geltende Rechtslage und Handlungsempfehlungen" (in German)
• "Das Recht auf eine Zweitveröffentlichung" (Version vom Juli 2015), Folder zum Zweitöffentlichungsrecht für wissenschaftliche Artikel, herausgegeben von Urheberrecht für Bildung und Wissenschaft e.V. in Zusammenarbeit mit dem Aktionsbündnis „Urheberrecht für Bildung und Wissenschaft“ (in German)

"Das Recht auf eine Zweitveröffentlichung" (Version vom Juli 2015), Folder zum Zweitöffentlichungsrecht für wissenschaftliche Artikel, herausgegeben von Urheberrecht für Bildung und Wissenschaft e.V. in Zusammenarbeit mit dem Aktionsbündnis „Urheberrecht für Bildung und Wissenschaft“