The mystery continues around the apparently hacked identification numbers of millions of Apple devices. The group known as Anti-Sec says it stole the data from the FBI, along with other personal user information, and then posted a million of the ID numbers on the web.
On Wednesday, Apple denied ever giving the so-called Unique Device Identifiers to the FBI or any other organization.
The FBI denies any computer breach, or that it had the ID numbers in the first place.
Jennifer Granick is with the Stanford Center for Internet and Society. She doubts the data came from the FBI, but says the case is an uncomfortable reminder.
"It is part of the constellation of information that Americans are desperately hungry for about what our government surveillance practices are and what tools and techniques they're using. So we really need a lot more transparency here."
The identification numbers of Apple devices do not in themselves pose a security risk, but if they're linked to names and addresses, they could be used to gain more sensitive user information.