Facebook and other defendants have been ordered to pay $500m (拢395m) after it was ruled they unlawfully used a firm鈥檚 virtual reality technology.
The social network purchased Oculus in 2014, which used a computer code designed by game developer Zenimax in its Rift VR headsets.
Following a three week trial at the US District Court in Dallas, Oculus said it was 鈥榙isappointed鈥� by the result and vowed to appeal against the ruling.
Zenimax聽 will be awarded damages from Facebook, Oculus and Oculus executives.
Chief executive Robert Altman said: “We are pleased that the jury in our case in the US District Court in Dallas has awarded Zenimax $500m for defendants’ unlawful infringement of our copyrights and trademarks.鈥�
It was ruled none of the defendants misappropriated Zenimax’s trade secrets, but Oculus co-founder Palmer Luckey was found to have broken a non-disclosure agreement.
Shortly after the ruling, Facebook released its latest results, showing a strong end to last year, doubling profit to $3.6bn in the fourth quarter.
Advertising revenue grew by 53 per cent.