This work has been carried out within the research project « ICT Converging on Law: Next
Generation Services for Citizens, Enterprises, Public Administration and Policymakers » ,
sponsored by Piedmont Region (http://www.ict4law.org). Although this work is the result of a
common will, every paragraph has been written by a single author; particularly: 1st and 2nd
sections by Roberto Candiotto; 3rd and 4th sections by Silvia Gandini.