Tesla's inner workings are famously secretive — and a newly unsealed court filing reveals the lengths Elon Musk's electric car company goes to safeguard its prized Autopilot technology. In a sworn declaration made public this month in a wrongful-death lawsuit involving Autopilot , Tesla engineer Christopher Payne described how closely the company guards the technology behind its driver-assist system — even from many of its own employees. "Access to certain software, specifically within the