If there's Rambus tech being used in DDR4 they should get paid but Hynix and Micron has a history of stealing patented designs. Hynix paid a huge fine to DOJ and employees went to jail for it. Micron rolled over and got leniency even though they were the ring leader. Maybe DOJ one day will wake up and understand this but i doubt it, Micron has to many influential people in their pocket.
@fdunn: I would be surprised if RAMBUS does not collect royalties for each DDR4 chip sold.
With Qimonda gone, Micron and Elpida fading, we will be left with a Samsung-Hynix Korean duopoly. DDR4 may be the last JEDEC spec. Samsung and Hynix can just make their own spec and force it on the market.