On April 14, 1951 the headquarters agreement between the government of Canada and the International Civil Aviation Organization was signed in Montreal. The agreement provided for the recognition of ICAO, on the part of the Canadian government, as an international organization composed of sovereign states members and as a specialized agency in relationship with the United Nations. The organization, its assets, and its property enjoyed the same immunity from suit and judicial process as enjoyed by foreign governments although ICAO could waive the immunity in certain circumstances. The headquarters premises, its archives and documents were inviolable, its property was exempt from any search or other interference except with the consent of the Secretary-General. Certain exemptions from taxes and customs duties were granted as well as privileges in regard to exports, imports and exchange. The Canadian government was to permit and facilitate the entry of representatives of information agencies accredited to ICAO after consultation with Canada. Special entry facilities were granted to representatives of the United Nations or specialized agencies on official business.