The Metathesaurus contains source vocabularies produced by many different copyright holders. The majority of the content of the Metathesaurus is available for use under the basic (and quite open) terms described in the Metathesaurus license http://www.nlm.nih.gov/research/umls/license.html
However, some vocabulary producers place ADDITIONAL RESTRICTIONS ON THE USE OF THEIR CONTENT AS DISTRIBUTED WITHIN THE METATHESAURUS.
The various levels of additional restrictions are described in Section 12
of the license. The level that applies to individual vocabularies is recorded
in the Appendix to the license. If a UMLS user already has a separate license for
use of one of the source vocabularies, the user's existing license also applies to
that source as distributed within the Metathesaurus. In some cases, UMLS users
may have to request permission or negotiate a separate license with a
vocabulary producer in order to use that vocabulary in a production
system. There may be a charge associated with these separate permissions
or license agreements.
Please select "Accept" or "Do Not Accept" below after reviewing the license agreement at the URL above.