How law enforcement's iPhone crackers keep their secrets

GrayKey is an iPhone cracking toolkit sold to law enforcement by Grayshift, a company specializing in forensic extraction. Through public record requests, Vice obtained examples of the legal agreements it uses to keep its technology secret.

"Without limiting and foregoing, you acknowledge and agree that you will not disclose the existence of any GrayKey features and solutions designed to circumvent USB Restricted Mode released in iOS 11.4.1 and updated throughout future iOS versions made available to you on or about the date hereof," one section reads.