C. J. Serrão and J. Marques, "Improving Content Privacy on Social Networks Using Open Digital Rights Management Solutions", in Procedia Technology - CENTERIS 2013 - Conf. on ENTERprise Information Systems / ProjMAN 2013 - Int. Conf. on Project MANagement/ HCIST 2013 - Int. Conf. on Health and Social Care Information Systems and Technologies, Maria Manuela Cruz-Cunha, João Varajão, Helmut Krcmar and Ricardo Martinho, Ed., Holanda, Elsevier, 2013, vol. 9, pp. 405-410