The IPTC acknowledges that a couple of Controlled Vocabularies (CV) created by other bodies are widely used for news exchange. As the IPTC does not intend to duplicate existing work thus urging users to maintain a couple of CVs with actually the same scope in parallel the IPTC recommends to use these non-IPTC controlled vocabularies.

A directory of IPTC recommended CVs of other parties can be found on the web site cvx.iptc.org

The IPTC explicity acknowledges all Intellectual Property associated with these CVs and underlines that it only recommends their use but does not assert or claim any ownership or rights regarding these CVs.