The video game publisher that won a case against Facebook-owned Oculus has asked a judge to block the firm from using its code in virtual reality products.
Earlier this month a US court ruled that Oculus had used ZeniMax's code without permission.
If the ban is granted, it could limit the number of games available for sale with the Oculus Rift VR headset.
A spokeswoman for Oculus said that the company was continuing with its appeal.
Tera Randall told Reuters that the original verdict was "legally flawed and factually unwarranted".
ZeniMax was awarded $500m (£398m) earlier in February when a jury found that Oculus, which Facebook bought in 2014, had violated a non-disclosure agreement.