Directory of Open Access JournalsDOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals. The DOAJ Seal is a mark of certification for open access journals, awarded by DOAJ to journals that achieve a high level of openness, adhere to Best Practice and high publishing standards. To receive the Seal, the journal must comply with the following 7 conditions: use DOIs as permanent identifiers; provides DOAJ with article metadata; deposits content with a long term digital preservation or archiving program; embeds machine-readable CC licensing information in articles; allows generous reuse and mixing of content, in accordance with a CC BY, CC BY-SA or CC BY-NC license; has a deposit policy registered wíth a deposit policy registry; allows the author to hold the copyright without restrictions.