Eyebrows were raised by Silvaco Data Systems Inc.’s aggressive move when it sued the customers of a software maker, Circuit Semantics Inc., that it had beaten in a trade secrets case.

Last week, one of those customers, Cypress Semiconductor Corp., notched a win in the long-running fight. Santa Clara County Superior Court Judge Kevin Murphy granted summary judgment to Cypress, ruling that Silvaco didn’t have the evidence to show that Cypress acquired or knew about the stolen trade secrets when it bought software from Circuit Semantics.