To clarify the rules (based on rule 21 and the definition of "prediction algorithm" earlier in the rules):
Any software required to execute the prediction algorithm must fall into one of three categories: (a) you have unrestricted right to grant a license to HHN, (b) must be in the list of OSI-approved licenses (http://opensource.org/licenses/alphabetical),
or (c) must be software for which HHP has waived these requirements.
Based on above written approval, Matlab & Base SAS fall under (c), so that's fine. You said that Base SAS is all that's required to execute the models. Can you confirm that only Matlab and no add-ons are requried for those models?
Unless you produce code that would execute the models without CART/MARS & Gen software, those would need to be exceptions. I'm looking into licensing difficulty/costs for those, which is what would determine whether HHP is willing to make an exception for