On 28 August 1952 the then NATO member states signed the Paris Protocol in Paris. Its official title is "On the Status of International Military Headquarters Set up Pursuant to the North Atlantic Treaty" and it establishes the status of allied and national headquarters and respective procedures. The Protocol is part of the so-called NATO legal acquis. All NATO member states have ratified the protocol, except Canada, which signed but did not ratify it. France ratified the protocol in 1955 but denounced its ratification in 1966.