Apple has filed what it calls “shocking evidence” in its ongoing lawsuit against OpenAI, alleging that former employee Chang Liu stole trade secrets and used them in his work at OpenAI.

The evidence emerged after Liu, who now works at OpenAI, handed over his old Apple work laptop.

Apple claims that Liu used a confidential Apple circuit schematic and a tool with the same name as an internal Apple engineering application.

Furthermore, Apple alleges that OpenAI was aware of Liu’s access to Apple data and that Liu enlisted an OpenAI colleague to help destroy evidence when he learned of Apple‘s investigation.

The filing states that the MacBook provided limited information and shows that Apple is not conducting “fishing expeditions” but that its trade secrets are being used.

Although the new evidence is redacted, previous filings included text messages from Liu showing he knew he still had access to Apple files.

OpenAI has defended Liu, claiming he only accessed files after leaving Apple to help former colleagues who asked for assistance.

OpenAI characterized the access as a “common issue” caused by Apple‘s failure to manage system access properly. Apple, however, claims Liu exploited a rare authentication bug.

Apple is seeking a preliminary injunction to block OpenAI from working on hardware based on Apple‘s technology while the case proceeds, as well as expedited discovery, citing the possibility that more former employees may be implicated.

Apple‘s initial filing noted that over 400 former Apple employees now work at OpenAI.