The law in California is complicated, and appears to hold that a company is liable if they "knew or should have known" the information they were using was misappropriated. This came up a bunch back in the SCOX v. IBM days.
Re:Uber and Waymo Reach Settlement
by dsfyu404ed on Friday February 09, 2018 @03:53PM
(#16343738)
>If learn a trade secret you cannot use it.
It depends on how you learn the a trade secret.
Put if you steal the recipe to Coke and email it to Pepsi, they can't use it, even if use doesn't disclose it.