The International Open Data Charter is a set of principles and best practices for the release of governmental open data. The charter was formally adopted by seventeen governments of countries, states and cities at the Open Government Partnership Global Summit in Mexico in October 2015. The original signatories included the governments of Chile, Guatemala, France, Italy, Mexico, Philippines, South Korea, the United Kingdom and Uruguay, the cities of Buenos Aires, Minatitlán, Puebla, Veracruz, Montevideo, Reynosa, and the Mexican states of Morelos and Xalapa. As of 2020, 74 national and local governments are signatories.