Main Concept simply license codecs. That spec doesn't actually mention what matters. Data rate, profile, Transport stream etc. Also is the audio PCM or data compressed - 16 or 24 bit etc etc.
If you can get the real spec then you might find that Compressor can create exactly what they require. mpeg2 is no an exclusive Main Concept codec so if you get the proper spec and do a short test you will probably be fine with Compressor. If you have Adobe Media Encoder it seems to have a few more adjustable parameters including profile settings that will probably be important.