1. AT & T privacy bird, http://www.privacybird.com/
2. OASIS, eXtensible Access Control Markup Language (XACML) TC, http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=xacml
3. Ashley, P., Hada, S., Karjoth, G., Powers, C., Schunter, M.: Enterprise Privacy Authorization Language (EPAL 1.1), IBM Research Report (2003), http://www.zurich.ibm.com/security/enterprise-privacy/epal
4. Bhattacharya, J., Gupta, S.K.: Privacy Broker for Enforcing Privacy Policies in Databases. In: Proceedings of Fifth international conference on knowledge based computer systems, Hyderabad, India (2004)
5. Rosencrance, L.: Toysrus.com faces online privacy inquiry, http://archives.cnn.com/2000/TECH/computing/12/14/toysrus.privacy.inquiry.idg/toysrus.privacy.inquiry.html