Farzad Salim Nicholas Paul Sheppard Reihaneh Safavi-Naini Enforcing P3P Policies Using a Digital Rights Management System. 200-217 2007 conf/pet/2007 Privacy Enhancing Technologies http://dx.doi.org/10.1007/978-3-540-75551-7_13 db/conf/pet/pet2007.html#SalimSS07