Edward,
My understanding is this: if you have already paid for a portion of the inputs of your project, you should only have to pay the difference in the remaining inputs. If you look at the 1Ds screen, your licensed inputs should display an L in a little box. If it seems that ALL your inputs are unlicensed, then I would be concerned. I have yet to use the same inputs in multiple PPI projects, but I am to understand that these inputs are licensed for ALL future PPI models. If I am incorrect, someone please enlighten us!