Is fugitive Edward Snowden a "Leaker" or a "Whistle-blower"?

Today (Wednesday June 12, 2013) there is a 10 - 11 a.m. Eastern discussion on the NPR Diane Rehm Show (guests & call-in dialogue - chat): Whistle-blowers who expose crime, corruption and abuse of power have protections under the law. Understanding when revealing top secret information is an act of heroism or a crime. Guests Jesselyn Radack national security & human rights director, Government Accountability Project Matthew Cooper editor, National Journal Daily. Scott Fredericksen managing partner at the law firm Foley & Lardner, and a former federal prosecutor and independent counsel. http://thedianerehmshow.org/shows/2013-06-12/leakers-versus-whistle-blowers