Apple has spent years doing this. Think back to their complaints and lawsuits about Motorola's rates. I'm not sure Apple ever paid them. Too bad, it might've kept Moto a US company. Apple did the same to Nokia, who then sued them in Delaware for a jury trial. Apple, not having the advantage of a home California jury, saw the light and settled out of court. Mind you, it's considered normal to do this for a short while (using ETSI FRAND patents until a deal is made). But Apple's lawyers have turned it into a delay art form. After all, the worst case is they pay back royalties after denying funds to their patent holding competitors for years. The best case is, they find a sympathetic court which sets a much lower rate.