A new Apple patent spotted by Patently Apple would train Siri to recognize specific voices, creating the potential to limit who the digital assistant recognizes and add new controls. Once configured, a customized combination of a specific phrase and a user’s voice—which Apple’s patent refers to as a “lexical trigger”—would be required to get Siri to respond. Current voice-activated digital assistants respond to specific speech, but not to specific speakers, creating circumstances where a user’s request can be picked up and acted upon by other devices in earshot. In addition to limiting that type of confusion, the change could allow users to place restrictions on everything from who can use Siri’s search on an unattended iPhone to who is allowed to rent movies from an Apple TV.