The object of this Recommendation is a set of basic requirements for an exchangeable@ embedded common interface@ in order to download any necessary CA/DRM system to CPE. The download process is operated under a trusted environment and enables the consumption of protected content delivered via broadcast and/or broadband connections with various types of terminal equipment in line with the acquired content rights of the end-user. This Recommendation is one in a series of Recommendations@ specifying the whole ECI eco-system.