 Oculus Rift now faces a challenge over who legally owns the future of virtual reality. I'm Chris Ziegler and this is 90 seconds on the verge. VR is making a comeback and Oculus is at the center of that revival. The former Kickstarter Phenom was recently acquired by Facebook for $2 billion. But before all that, the Oculus Rift was a prototype held together by duct tape. Fatefully, it caught the attention of legendary game programmer John Carmack, best known for Wolfenstein, Doom, and Quake. Carmack contributed to the project early on. In fact, it was in his office in 2012 that we first tried it out. But Carmack didn't own his own studio. That belongs to game publisher Zenimax. When Carmack decided to join Oculus in 2013, Zenimax didn't initially make a fuss, but now it says that because Carmack was instrumental to Oculus' success, it owes Zenimax money. Carmack, for his part, claims that Oculus, quote, uses zero lines of code that he wrote while under contract to Zenimax. But even if that's true, how else may he have helped? That leads us to one crucial document in particular. Back in May 2012, Oculus founder Palmer Luckey signed a non-disclosure agreement with Zenimax. NDAs are pretty routine, but sources tell us that the company is interpreting the contract to mean Zenimax owns part of the Oculus idea via its contributions. But what is Zenimax really after here? According to the Wall Street Journal, the company is seeking compensation, which in layman's terms probably means a cash settlement. With Facebook, there's plenty of that to go around. For more on Oculus, check out The Verge. Coming up next, the restaurant industry and the city of New York offer a modest joint proposal to tackle the city's rat problem. Oh, no. Oh, God, no. It's gross.