It was my understanding that it's practically impossible to build a phone or a tablet without buying licenses for closed, patented technology. It's not that exFAT would be the first or the only one. What I don't understand is why it gets this attention... If this were a serious issue, we'd have to ask Jolla which patents are used in the basic version of the tablet (without stretch goals) ans remove all of them (because they're payed with crowdfunded money.)