Recommendation ITU-T X.1191 addresses the functional requirements, architecture, and mechanisms dealing with the security aspects of IPTV content, services, networks, terminal devices, and subscribers (end users).
ITU-T X.1191 SPANISH-2009 Referenced Document
ITU-T X.509-2008 Information technology – Open systems interconnection – The Directory: Public-key and attribute certificate frameworks (Study Group 17)