[Willis Kieninger]"Are P6000 boards the same for Mac and PC?"
[Willis Kieninger]"Will my system key work with a board I purchase used?"
No. The system keys are connected to the board serial. You either need to get in touch with the Media 100 guys, or you need to purchase a board with a matching encryption code for the features you need. Of course you also could upgrade to a newer Media 100 version.