...... again, when I say transponder, I mean digital carrier.. while yes, you can have multiple digital carriers in the space of one 36mhz wide analog transponder, since this isnt an analog discussion, its a moot point
in a single carrier, located at 4040 V 26665, the encapsulation and encoding method is DVB.. now, you cannot use DCII encrypt over DVB, as the encapsulation will not line up.
If NASA decides to put another digital carrier in the same 36mhz wide space, then sure, they can put a DCII signal down the same "transponder"
Now, since they have only announced this one carrier, and that the addressable portion will be in THIS one, the assumption can be safely made that a DVB encapsulated encryption is used, such as PowerVu, Irdeto, Nagravision, Wegner, etc..etc..