Derek Pasquill said he had been "completely vindicated"
Derek Pasquill, 48, of west London, was accused of making damaging disclosures by leaking confidential documents to the New Statesman and the Observer.
The papers were said to refer to secret CIA flights and the UK's contact with Muslim groups.
His lawyer said a prosecution decision to drop charges was "vindication" that what he did was in the public interest.
Mr Pasquill said:
- that he had been through a "very unpleasant ordeal" but that he had been "completely vindicated in my actions in exposing dangerous government policy and changing its priorities".
- that he felt the information was of "such importance" that it was right to leak the documents to a journalist "in order for that information to be discussed and debated".
- "I thought this information deserved to make an impact in public and I took the steps that I did on that basis".
- that it was better to have these issues debated in public than leave them to "a small group of officials who are driving a policy".