In the film, Ex Machina, an employee must sign the non-disclosure agreement before beginning work on a secret project. The agreement states:
The signee agrees to regular data audit with unlimited access, to confirm that no disclosure of information has taken place, in public or private forums, using any means of communication, including but not limited to that which is disclosed orally or in written or in electronic form.
Is this legal? Do similar NDAs actually exist? How do "data audits" work when applied to an individual?