Regulation 910/2014 enters into force the 1 July 2016, until then, please refer to Directive 1999/93/EC of the European Parliament and of the Council of 13 December 1999 on a Community framework for electronic signatures, Article 5(1)(a).Also see proposal for a European Digital Identity (EUid) and Revision of the eIDAS Regulation: https://eur-lex.europa.eu/legal-content/EN/PIN/?uri=cellar:35274ac3-cd1b-11ea-adf7-01aa75ed71a1