to start with, for every drd input (4 at each drd) you can lock one transponder and then receive the video services of the transponder for multiplexing to ip over the GBE card.. For this action, we usually get the LDCM-SAT-1/per rf input. This license allows one multiple transport stream per transponder.
Then, if the services are not FTA, you need to add the amount of the CI/CA modules going to be used for descrambling, as such one LDCM-CI-1 for each CI slot.
Never used the 8VSB before.Last, for the FEC license, this is purely driven by your requirements but i am not sure if you need a co-processor on top of the GBE card.
hope it helps