Itaru Kaneko Katsuhiko Shirai Mika Onishi Neergaard Probabilistic Multi-Lateral Security Model for Ubiquitous Multimedia Services. 236-241 2004 conf/icdcsw/2004 ICDCS Workshops http://csdl.computer.org/comp/proceedings/icdcsw/2004/2087/01/208710236abs.htm db/conf/icdcsw/icdcsw2004.html#KanekoSN04