The ITU-T has a Telecommunication Standardization Bureau director's "Ad Hoc" group on IPR that produced the following definition in March 2005, which the ITU-T as a whole has endorsed for its purposes since November 2005:: The ITU-T has a long history of open standards development.
== Specifične definicije odprtega standarda ===== ITU-T definicija ===ITU-T je organizacija za razvoj standardov (ORS), ki je del treh sektorjev mednarodne telekomunikacijske unije (posebna agencija Združenih narodov).