In the interest of promoting and maintaining secure environments for handling, storing, and transmitting of sensitive material, such as keys, certifications, operating code, etc., this document defines the IPTV interoperability specifications for Security Robustness Rules. This specification pertains to IPTV devices both on the server side and on the receiving side. This document augments the IPTV Security Solutions (ISS) Security Profiles by defining Secure Execution Environment elements and their robustness levels. The ISS Security Profiles and robustness levels may be useful in matching content value to platform security capability.