This volume is devoted to the presentation of several research contributions from some significant European research projects in the domain of legal technologies. In this domain European research has been particularly active in the last years, often achieving global leadership. This is due to the commitment of individual researchers, research centers and universities, but also to the support of the European Union that in various research programs has devoted a significant attention (and some relevant financing) to legal technologies, considering them a decisive aspect of E-government and a crucial resource for the development of the information society.