2.1.1.3.5.2 MPEG-2 Elementary Streams
MPEG-2 ES content MUST be encrypted as specified here.
The RTP Payload Format for Windows Media Audio and Video [WMRTP] MUST be used to carry MPEG-2 ES content when protected by WMDRM: Network Devices Protocol. The mapping of MPEG-2 ES content to RTP is defined in sections 2.1.1.3.6, 2.1.1.3.7, and 2.1.1.3.8.