Dropbox, the popular cloud-based file storage service, has upwards of 200 million registered users.
I doubt many of them have ever read the company’s privacy policy, which states clearly that the company will fully comply with requests from law enforcement agencies.
And while the company does encrypt your files across their multiple data centers, they hold the decryption keys.
Bottom line, just like Google has access to your web history (plus email if you’re a Gmail user), and Facebook has access to huge parts of your personal life, Dropbox has access to every single file that you host with them.
And based on the company’s own policies, all of this can be handed over at any time to any government agency, all without your knowledge or consent.