1. Advanced Television System Committee (ATSC) (2004). Conditional Access System for Terrestrial Broadcast, A/70A, May 2004.
2. Advanced Television System Committee (ATSC) (2009). Digital Television System, A/53, Aug. 2009.
3. ATIS (2007). ATIS Releases Default Scrambling Algorithm for IPTV. ATIS-0800006, Mar. 2007.
4. Bajaj, S. (2010). OCRA: OATH challenge Response Algorithm. IETF Internet Draft Informational, Sep. 2010.
5. Becker, E., Buhse, W., Günnewig, D., & Rump, N. (2003). Digital Right Management, Technological, Economic, Legal and Political Aspects. Digital Right Management.org, 2003.