Exactly. Quoting Dropbox's terms of service: > We need your permission to do things like hosting Your Stuff, backing it up, and sharing it when you ask us to.

Exactly. Quoting Dropbox's terms of service: > We need your permission to do things like hosting Your Stuff, backing it up, and sharing it when you ask us to. Our Services also provide you with features like photo thumbnails, document previews, email organization, easy sorting, editing, sharing and searching. These and other features may require our systems to access, store and scan Your Stuff. You give us permission to do those things, and this permission extends to trusted third parties we work with. However congenial this sounds, they reserve the right to look at your stuff —— worth noting.