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The United Kingdom – United States of America Agreement (UKUSA, )〔Also known as the ''Quadripartite Agreement'' or ''Quadripartite Pact'' ()〕 is a multilateral agreement for cooperation in signals intelligence between the United Kingdom, the United States, Canada, Australia, and New Zealand. The alliance of intelligence operations is also known as Five Eyes.〔 In classification markings this is abbreviated as FVEY, with the individual countries being abbreviated as GBR, USA, CAN, AUS, and NZL respectively.〔Top Level Telecommunications, (Five Eyes, 9-Eyes and many more ), 15 November 2013〕 Emerging from an informal agreement related to the 1941 Atlantic Charter, the secret treaty was renewed with the passage of the 1943 BRUSA Agreement, before being officially enacted on 5 March 1946 by the United Kingdom and the United States. In the following years, it was extended to encompass Canada, Australia and New Zealand. Other countries, known as "third parties", such as West Germany, the Philippines and several Nordic countries also joined the UKUSA community.〔 Much of the sharing of information is performed via the ultra-sensitive STONEGHOST network, which has been claimed to contain "some of the Western world's most closely guarded secrets". Besides laying down rules for intelligence sharing, the agreement formalized and cemented the "Special Relationship" between the UK and the USA.〔 Due to its status as a secret treaty, its existence was not known to the Prime Minister of Australia until 1973, and it was not disclosed to the public until 2005.〔 On 25 June 2010, for the first time in history, the full text of the agreement was publicly released by Britain and the United States, and can now be (viewed online ).〔 Shortly after its release, the seven-page UKUSA Agreement was recognized by ''Time'' magazine as one of the Cold War's most important documents, with immense historical significance. Currently, the global surveillance disclosure by Edward Snowden has shown that the intelligence-sharing activities between the First World allies of the Cold War are rapidly shifting into the digital realm of the Internet. ==History== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「UKUSA Agreement」の詳細全文を読む スポンサード リンク
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