Frankly, on the collection of metadata and the extent to which it's undertaken, I think you really need to turn to our colleagues at CSE. I don't think a huge amount of metadata is collected. I'll let my colleagues correct me, but generally speaking, it is essentially data that is the equivalent of non-personalized information about a device—the length of time, where that device is, and that kind of thing.
Perhaps my colleagues would like to take a stab at it.