OCAP
The American company CableLabs collaborated with DVB for the creation of a new opened standard, which it led to the acceptance of the specification of the standard MHP as base for this standard, the OCAP (OpenCable Application Platform), in January, 2002. With MHP in its center OCAP provides a common especificaión for the middleware layer for the systems of cable in the United States. Since in the United States DVB standards are not used, OCAP is based on those parts that are not DVB specific, replacing the rest of DVB specific ones such as DVB IF API. Originally, OCAP was based on the 1.0.0 version of the specification MHP.
Later, DVB presented the specification Globally Executable MHP (GEM) to facilitate the use of MHP's elements in other specifications. OCAP's recent versions use GEM instead of MHP as base, but they refer to some MHP's elements that are not included in the especificaión GEM.
Read more about this topic: Interactive Television Standards, Open or Public Standards