A secret Downing Street memo detailing talks between US President George Bush and Prime Minister Tony Blair was leaked by a civil servant, the Old Bailey has heard.
David Keogh passed the memo to a friend, Leo O'Connor, at a local dining club in Northampton.
But police were called in when political researcher O'Connor placed it in papers for his boss, Anthony Clarke, Labour MP for Northampton South, to see, the jury was told.
David Perry QC, prosecuting, said the reason the memo was leaked was to bring its contents into the public domain.
But the record of the April 16, 2004, meeting in Washington was sensitive and was concerned with the US and UK policy towards Iraq.
"The discussions ranged over a number of issues of a sensitive nature," said Mr Perry.
"This document contained information about this nation's defence interests and this nation's international relations."
The judge told the jury that parts of the case relating to sensitive material and matters of national security would be held in camera away from the public.
The contents of the memo were not read out in open court.
Keogh, 50, and O'Connor, 44, both from Northampton, are charged under the Official Secrets Act of 1989.
Keogh, who was a communications officer at the Cabinet Office, was alleged to have passed the memo to O'Connor between April 15 and May 29, 2004.
Keogh denies two charges of making a damaging disclosure of part of a Government document in his possession as a Crown servant without lawful authority.
O'Connor denies a charge of making a damaging disclosure of a document passed to him illegally.
Mr Perry said the Washington meeting had been attended by the President and Prime Minister, together with "highly placed" individuals from both sides.
A record of the discussions was compiled by Matthew Rycroft, Mr Blair's private secretary for foreign affairs, on the same day.
It was written on Downing Street headed paper at the British Ambassador's residence in Washington and was addressed to Geoffrey Adams, of the Foreign and Commonwealth Office, said Mr Perry.
"The letter was marked 'secret and personal' at the bottom of each page," he added.
It was to be sent to specific people in the Ministry of Defence, the Cabinet Office, the British Ambassador in Washington, the United Nations in New York and the British representative in Iraq.
Mr Perry said the letter emphasised that it must not be copied further and must only be seen by people who needed to know. It was then sent on a secure fax machine to 10 Downing Street.
Part of the distribution system involved the memo going to the Cabinet Office communications centre in Whitehall, where Keogh was on duty, said Mr Perry.
Keogh allegedly took the faxed copy or parts of it "in order to disclose its contents". Mr Perry added: "His intention was to make the contents public or put them into the public domain."
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Poster Comment:
This will rise above the din in the UK only...