When Apple executives appear at its annual developer conference in mid-June, they are expected to unveil details of how it will integrate AI in its Siri virtual assistant and other products. One of the big questions is how it will do so while still honoring its promises to protect the personal data of its users.The answer? Apple plans to process data from AI applications in a virtual black box, making it impossible for its employees to access it, according to four former Apple employees who work...