The problem with licensed content tends to not be paying for it, but rather the fact that they'd need to renew the license at all. It usually isn't financially an issue because you can just include the what may need to be paid in the price of the collection...but dealing with the legalese is time consuming (and then I suppose paying lawyer fees can be expensive) and typically not worth it.
Looking at the collaboration SE had with Ubisoft and Bioware, they were most likely good will collaborations rather than something SE had to pay for but both companies mutually benefitted from the DLC sales.