The FCC DSTAC is going to recommend a downloadable security system for CE platforms like TVs, game consoles including ARM and other STBs. For Vidipath capable Smart TVs which are also ATSC 2.0 ready, they are already DRM certified to support Common Encryption DRM which is the format that HTML <video> EME, 4K Digital bridge and likely the DSTAC will recommend and won't need a cable box or network tuner. All other STBs and game consoles will need a network tuner. When will it be implemented; 2016.
THE XB1 and PS4 will be 4K blu-ray players with digital bridge and Vidipath clients using WMDRM10 for DTCP-IP. As a digital bridge they will be hubs for the home and when they can be connected to a network tuner, will be DVRs and vidipath servers to other devices in the home. Besides supporting WMDRM10 which can't stream 4K media in the home, they will support Playready ND with Certificate Security Level of 3000 to allow streaming of 4K media and WMDRM10 to Playready ND conversion. Playready 3 (software porting kit 3 to TEE hardware like ARM trustzone) will no longer have WMDRM10 as a subset with Playready ND to replace it.
Because of the delay (from Dec 2012) in getting Vidipath started we are already looking at 4K media support from Cable TV. Vidipath DVRs (WMDRM10 for DTCP-IP) can't stream 4K but cable has plans to support a limited number of 4K channels late this year. No one is talking but Playready ND has this: Note that this model can also be applied to both live streams, video-on-demand and DVR content."