"Right to ID
Unlike Bitcoin, which is designed to be anonymous, the __zen is not and has never been by definition an anonymous digital currency__. In case of large and/or suspicious transactions, the Zen Agents __reserve the right to establish the identity of the person selling zen__. This does not mean that your identification will necessarily be viewed, but that it may be requested."
Yep, they'll sure be popular among whistleblowers, privacy-nerds and undeground hackers..
But it's only beginning, maybe they'll redesign this whole project and assure privacy and anonymity.
Time will show us, though.