The International Civil Aviation Organization Public Key Directory (ICAO PKD) is a database maintained by the International Civil Aviation Organization holding national cryptographic keys related to the authentication of e-passport information.
The ICAO PKD content is open to the public, and can be downloaded for free at https://download.pkd.icao.int/.
[1] The United Nations became the first non-state participant in October 2012, enabling issuing of e-UNLP, the electronic form of the United Nations laissez-passer.
[3] In 2015 the German Bundesdruckerei (German Federal Printing Office) won the request for tender of the ICAO to provide the ICAO PKD.
Every participant pays the same amount of annual fees.