Data Privacy Management and Autonomous Spontaneus Security : 6th International Workshop, DPM 2011 and 4th International Workshop, SETOP 2011, Leuven, Belgium, September 15-16, 2011, Revised Selected Papers - Joaquin Garcia-Alfaro, Guillermo Navarro-Arribas, Nora Cuppens-Boulahia, Sabrina Capitani di Vimercati ((Lecture Notes in Computer Science))