Now that Oculus has Mark Zuckerberg as a sugar-daddy, it seems that ZeniMax wants in on some of that sweet Facebook cash. John Carmack's former employer is claiming that Oculus VR is unfairly using its intelectual property, and it's threatening to take action. John Carmack and the Oculus team quickly and publicly rebutted ZeniMax's claims, but the legal situation is bound to get even stickier from here.