OCAP, ACAP and ARIB
CableLabs and ATSC both took GEM as the basis for their own digital TV
standards (OCAP in the case of CableLabs, ACAP in the case of ATSC).
These both use elements from the full MHP specification as well as GEM.
The biggest difference is in the service information handling: both
OCAP and ACAP use ATSC service information, ...