This lawsuit originated in 2014, when ZeniMax accused Oculus of trade secret misappropriation (coincidentally, the same year Facebook bought Oculus). ZeniMax had claimed that id Software co-founder John Carmack provided technology to Oculus before ever being employed by Oculus, while still working at ZeniMax, and even went to say that the Oculus Rift would never have been created without ZeniMax's assistance. Interestingly however, the jury did not find trade secret misappropriation in this case, but provided an award nonetheless on as combination of contractual breach (NDA), copyright infringement, and false designation (rooted in trademark law).
Part of this may be due to indisputable evidence of a contractual obligation between ZeniMax and Palmer Luckey. See NDA at https://archive.org/details/pdfy-CYfP6trvhgVHdd3R.
Part may be due to admission by John Carmack that he took thousands of documents and lines of code from ZeniMax before his departure. “I copied files that I shouldn’t have. I think stealing is an uncharitable way to look at it since I didn’t benefit and Zenimax didn’t lose, but I shouldn’t have done it, and I did,” Carmack said while being questioned by Zenimax’s lawyer. This point undoubtedly aided the finding in "non-literal" copyright infringement .
Regardless, the results of the case are inconsistent with neither side is completely happy, and Oculus / Facebook is poised for appeal, while ZeniMax is posturing for an injunction to halt sales of the Rift.