From DJI's White Paper:
Although UAS do not carry people, and so do not implicate free movement of people, identification information does indicate the location of the person operating the UAS, thus revealing the activities of persons and businesses. The interest in privacy is, unfortunately, arguably heightened compared to manned aircraft considering the occasional violent confrontations that UAS operators have faced over the last few years, including physical assault and gunfire. A system that enables belligerent individuals to look up the name and address of, and then knock on the door of, a local UAS operator, is not acceptable and will detrimentally impact UAS operators who are operating safely and doing nothing wrong. The personal information of the owner (or operator) should be accessible to law enforcement only, who can investigate complaints of unlawful or dangerous conduct. Privacy and personal safety interests compel an identification system that protects operator business interests and discloses personally identifiable information only to law enforcement agencies.