Rambus an NVIDIA have been fighting a patent war for a while now. Rambus alleges that just about everything that NVIDIA builds infringes on patents it owns.
Rambus took the case to the ITC and sought an injunction barring the import of the infringing products, which is just about everything but Ion from NVIDIA. Today the ITC ruled in Rambus’ favor and granted the injunction.
As of now, NVIDIA has the choice of not selling its products in the US or paying the Rambus licensing fees. NVIDIA plans to appeal the decision, but you can bet the checkbook is open at NVIDIA.