Apple has filed a lawsuit against Di Liu, a former senior product design engineer who worked on the Vision Pro headset, alleging that he stole thousands of confidential documents containing trade secrets. The lawsuit claims Liu took a "massive volume" of secret plans, including codenames, designs, and supply chain information related to the unreleased $3,500 Vision Pro headset, before leaving Apple to join Snap, the company behind Snapchat and smart glasses. Apple asserts that Liu secretly copied and transferred these proprietary materials to his new employer, prompting the legal action to protect its intellectual property.