Mark Zuckerberg is expected to appear in a Dallas court today to defend his company over claims it stole virtual reality technology. Zenimax Media, owner of renowned games studio id Software, is suing Facebook for $2bn (£1.6bn).
Zenimax argued its early innovations in VR were unlawfully copied when Oculus built its own headset, the Rift.
Oculus was bought by Facebook in 2014, and is seen as a major part of the firm’s strategy over the next 10 years.
The BBC understands Mr Zuckerberg will argue that Zenimax was slow to appreciate the potential of VR – and that it was Oculus’ own work that made it the valuable technology it is today.