OpenAI is facing a legal setback over the name of a key feature in its AI video generation app, Sora. The company may have to rename the feature known as "cameo," which allows users to insert themselves, their pets, or objects into AI-generated videos, after a U.S. District Judge ruled that the use of the term infringes on a trademark held by Cameo, the personalized video platform. Judge Eumi K. Lee issued a temporary restraining order on Friday, blocking OpenAI from using the word "cameo" or any similar name in connection with the Sora app until December 22. The decision comes after Cameo, the company known for enabling users to book personalized video messages from celebrities, filed a federal trademark lawsuit in California on October 28, arguing that OpenAI’s use of the term could confuse consumers and damage its brand. In her ruling, Judge Lee found that OpenAI is likely infringing on Cameo’s federally registered trademark. She noted that the company’s claim of potential harm to its own product launch is self-inflicted, as the alleged harm stems from its own use of a protected mark. “Defendants' only argument to the contrary is that the requested injunction would 'harm OpenAI's ability to successfully launch its Sora app and other Sora 2 functionality,'" Lee wrote. "However, Defendants' harm arises from its own likely infringing use of a federally registered mark." Cameo’s CEO, Steven Galanis, urged OpenAI to comply with the court’s order quickly, emphasizing the timing. “It's critical that @OpenAI adheres to Judge Lee's Temporary Restraining Order ASAP to prevent further irreparable harm to Cameo's brand and IP,” he posted on X. He added that 30% of all videos on the BookCameo platform are created between Thanksgiving and Christmas, making prompt action essential. Despite the ruling, OpenAI was still using the term "cameo" on the Sora app as of late Monday morning. The company said it disagrees with the lawsuit’s premise, stating in a statement to Business Insider: “We disagree with the complaint's assertion that anyone can claim exclusive ownership over the word 'cameo.'" OpenAI added that it looks forward to presenting its case to the court. A hearing has been scheduled for December 19 to determine whether the temporary injunction should be made permanent. The outcome could have significant implications for how AI companies name features and navigate trademark rights in the rapidly evolving digital landscape.