Spectrum SDC, MDC, CDC

The Spectrum family of products adds a layer of intelligence to
Adaptive Bit Rate video streaming delivery by providing services
such as on-the-fly repackaging between ABR formats, ABR session
management and targeted ad insertion services.

Spectrum SDC is typically installed at the edge of a HTTP based
video delivery network receiving ABR requests from video clients
and providing value added services such as repackaging on-the-fly,
ad-insertion, blackouts and session management.

Spectrum MDC is a subset product of Spectrum SDC. It also follows
a per-session model, but only handles manifest files but does not
handle media packets. It can be deployed on-net with the CDN or in
off-net models.

Spectrum CDC is a variant of Spectrum SDC which is deployed in the
core of the video delivery network, providing similar services such
as repackaging and ad-insertion but on a per channnel or asset basis
(instead of a per-session basis like SDC).