It's important to note here that most of the revenue is from HTC and most of that is not specifically from Android but from HTC Sense which is a UI layer HTC p

It's important to note here that most of the revenue is from HTC and most of that is not specifically from Android but from HTC Sense which is a UI layer HTC puts on top of Android and which was actually funded in part by MS in the first place to use with Windows Mobile - hence why they feel entitled to royalties when it is used outside that OS. So while it is correct to say that the money is coming from "Android phones", it's a bit misleading to say it is coming from "Android" per se - this is a HTC Sense / MS specific thing. Of course there are other non-HTC-sense patents too, but they are a much lesser part of the deal.