ZeniMax Media, id Software's parent company, is accusing Oculus of stealing its intellectual property from the time when John Carmack was still an employee at id. These accusations go back to 2014 when Facebook acquired Oculus for $2 billion, and resulted in the current trial where ZeniMax is seeking damages equal to the price Facebook paid for Oculus; they claim that John Carmack, who became Oculus's CTO after parting with id, used ZeniMax's "copyrighted computer code, trade secret information, and technical know-how" in the development of the Rift. ZeniMax is now further accusing Oculus of "intentional destruction of evidence to cover up their wrongdoing." Facebook's Mark Zuckerberg is also to appear on the stand. A Slashdot report based on this Ars Technica article offers a wider summary and historical links.