Apple, BlackBerry, Ericsson, Microsoft and Sony.
They are the owners of patents from Nortel, the fact that they are co-owned by many vendors suggest that they share these patents in order to operate. It seems to be a fact that if you are in the big league you need a large patent portfolio both for negotiation and protection. Google also bided on these patents and went on to buy Motorola mobility about a month later when they lost the bid. The link has nothing to do with Rockstar I believe.
The link has everything to do with Apple and a patent troll. Many here seem to think Apple is a victim of a patent troll but have no idea about Apple's involvement with patent trolling.