Creative Commons Attribution 4.0 International (CC BY 4.0) licence: background. As indicated in the publication, the "Reuse is authorised provided the source is acknowledged. The reuse policy of European Commission documents is regulated by Decision 2011/833/EU" [1] The Copyright notice of the European Commission [2] further clarifies [3] how "Unless otherwise indicated (e.g. in individual copyright notices), content owned by the EU [...] is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. This means that reuse is allowed, provided appropriate credit is given and changes are indicated". References [1] European Commission, 2011. Commission Decision of 12 December 2011 on the reuse of Commission documents (2011/833/EU). Official Journal of the European Union 54(L 330), 39-42. http://data.europa.eu/eli/dec/2011/833/oj [2] https://web.archive.org/web/20190905/https://ec.europa.eu/info/legal-notice_en [3] European Commission, 2019. Commission Decision of 22 February 2019 adopting Creative Commons as an open licence under the European Commission’s reuse policy. European Commission, C(2019) 1655 final. https://ec.europa.eu/transparency/regdoc/rep/3/2019/EN/C-2019-1655-F1-EN-MAIN-PART-1.PDF (archived version: https://tinyurl.com/C2019-1655-final)
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Rigo et al. (2017) studied this question.