Data retention EU Data retention might not be proportional to risks Monika Ermert, Heise, Intellectual Property Watch, VDI-Nachrichten PUBLISHED ON: 9 Jul 2013 Member states and EU bodies had to answer tough questions at the hearing of the European Court of Justice on July 9, 2013. The final ruling about the constitutionality of the EU Data Retention Directive is expected at the end of 2013.