Muhammad Torabi Dashti Srijith Krishnan Nair Hugo L. Jonker Nuovo DRM Paradiso: Designing a Secure, Verified, Fair Exchange DRM Scheme. 393-417 2008 89 Fundam. Inform. 4 http://iospress.metapress.com/content/d5287267p6u7502k/ db/journals/fuin/fuin89.html#DashtiNJ08