All papers published under ERC grants must comply with a specific open access policy. This is a quick recap of best practices for compliance, meant for project members:
upload the preprints on the a public repository before submission (e.g. arXiv; CVGMT does not qualify as open access repository);
before submission, check the policy of the journal (you can use the following tool: Use the following tool: https://openpolicyfinder.jisc.ac.uk/). It must allow one of the following open access options:
green open access: the author can upload the accepted version​ (after review) of the article on a public repository with an embargo period not longer than 6 months;
gold open access: The published version of the article is openly accessible to the public, a solution that typically requires the payment of Open Access (OA) fees. However, several journals have special agreements with SISSA, allowing for Gold Open Access publication without fees. You can find a list of these agreements here: https://library.sissa.it/readpublish-transformative-agreements.
after the article is accepted, update arXiv with the accepted version (wait for the embargo period if necessary). Provide the DOI link when available;
after the article is published, update arXiv with the full journal reference and upload the publication to IRIS, the SISSA preprint server, linking it with the ERC project.
Official guidelines can be found here: https://ec.europa.eu/research/participants/docs/h2020-funding-guide/cross-cutting-issues/open-access-data-management/open-access_en.htm#repository