1. Microsoft Windows Media Rights Manager, http://www.microsoft.com/windows/windowsmedia/howto/articles/drmarchitecture.aspx
2. iTunes FairPlay, http://www.apple.com/lu/support/itunes/authetication.html
3. PachyDRM, http://pachydrm.com
4. Secure Digital Container, http://www.digicont.com
5. International Standard ISO/IEC 15408, Common Criteria for Information Technology Security Evaluation, Part 1 (2005)