[rayiner]

But the amendment doesn't talk in terms of "not public." It refers to "their... effects." Words aren't meaningless. To make a case for protection under the 4th, you have to make a case that something is your paper or effect, not Google's, and not just anything that is "not public."

[pfortuny]

You're right. AFAIK I keep ownership of my data when using Google's resources, now that I think of it.