The purpose of this [draft new] Recommendation is to provide the reference service model, the architecture, and the service operation protocols which are needed for multi-CA/DRM service based on downloadable scheme. The downloadable scheme in this [draft new] Recommendation means downloading CA/DRM client software images from the multichannel video programming distributor (MVPD) or broadcaster to a secondary device such as smart phone, tablet, and laptop PC that are connected to a primary customer premises equipment (CPE) such as a set-top box. Service providers can change CA/DRM solutions for the secondary device from one to the other using on-line methods as well as operate multiple CA/DRM solutions at the same time.