Srijith Krishnan Nair Andrew S. Tanenbaum Gabriela Gheorghe Bruno Crispo Enforcing DRM policies across applications. 87-94 2008 Digital Rights Management Workshop http://doi.acm.org/10.1145/1456520.1456535 conf/drm/2008 db/conf/drm/drm2008.html#NairTGC08