To jump to conclusions, because it would undermine DirecTV's efforts in the PVR arena. That is, if they license the DirecTV tech to TiVo, who create a receiver, why would someone want to buy the DirecTV branded one? So that would reduce their market share by 50%. I doubt licensing fees could make that up.

On the other hand, I have to wonder how exorbitant TiVo's licensing fees are that everyone and their grandmother is developing their own PVR to compete.