The ABC Global Book Service is a free service that puts into practice the provisions of the Marrakesh Treaty. It allows participating libraries for the blind, referred to in the Marrakesh Treaty as Authorized Entities (AEs), to search, order and exchange books in accessible digital formats across national borders. Through the Service, Authorized Entities that are located in countries that have implemented the provisions of the Marrakesh Treaty are able to perform these exchanges without requiring further authorization from rights holders.[14][15][16]