ISO 26324 Information and documentation -- Digital object identifier system was published by ISO, the International Organization for Standardization, on May 1, 2012. The DOI System was approved as an International Standard through ISO in November 2010, but publication was held back awaiting revision by ISO of its generic Registration Authority agreement. ISO 26324 is the instrument through which the DOI System, developed by the International DOI Foundation (IDF) from 1998, was adopted as an international standard, and IDF is the ISO 26324 Registration Authority.