<ul><li><a href=http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2014.257.01.0073.01.ENG target=_blank>Regulation 910/2014 on electronic identification and trust services for electronic transactions in the internal market(Regulation (EU) No 910/2014 of the European Parliament and of the Council  on electronic identification and trust services for electronic transactions in the internal market and repealing Directive 1999/93/EC,OJ L 257, p. 73–114, adopted on 23 July 2014, last amended on 17 September 2014, Article 25(2))</a></li><li><a href=https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20160001579 target=_blank>Electronic signature act(Ustawa z dnia 5 września 2016 r. o usługach zaufania oraz identyfikacji elektronicznej, Dz.U. 2016 poz. 1579, 29 September 2016, last updated on 6 January 2021)</a></li></ul>