Disclosure is a process, that started here in the US by a man named Dr. Steven Greer who brought together over 550 military and scientific witnesses of ufo technology under a Congressional umbrella to get them amnesty when testifying about their knowledge of ufo/ET related projects. A lot of these men have been kept quiet over the years while working under private corporate contracts that were under the guidelines of their national security oath. These projects are illegal and extra-constitutional, keeping the advanced technology secret. All the men that have come forward so far have NOT been threatened or arrested. The Disclosure Project has spread to other countries and a lot of governments have already released their ufo files.

He has personally briefed the head of the CIA, Robert Gates (Secretary of Defense), Admiral Wilson and Patrick Hughes (DIA) and a host of others. Apparently these men find it embarrasing and frustrating that even THEY aren't allowed access to these "secret" programs. So the ball is rolling.

And reports are coming in from everywhere in several different mediums that disclosure is right around the corner. Even the Vatican is getting prepared.Here's an introduction:
http://www.disclosureproject.org/PDF-Documents/ObamaBriefingIntroLetter.pdf