<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://www.ris.bka.gv.at/GeltendeFassung.wxe?Abfrage=Bundesnormen&Gesetzesnummer=10003685&FassungVom=2016-06-30 target=_blank>Signature Act(Signaturgesetz (SigG), par. 4)</a></li><li><a href=https://www.ris.bka.gv.at/Dokumente/Erv/ERV_2001_1_152/ERV_2001_1_152.html target=_blank>Federal Act governing certain legal aspects of electronic commercial and legal transactions (E-Commerce Act – ECG)(Bundesgesetz, mit dem bestimmte rechtliche Aspekte des elektronischen Geschäfts- und Rechtsverkehrs geregelt werden (E-Commerce-Gesetz - ECG), BGBl. I Nr. 152/2001, last amended on 17 March 2015, Part 4 )</a></li></ul>