has clause Derivatives not allowed Usage unrestricted Distribution restricted Attribution required Free Vendor-specific License UMLS Metathesaurus License The UMLS Metathesaurus License is a vendor-specific license which allows redistribution (as part of a larger computer application) as long as the original data is attributed correctly and a summary of data use provided each year. There is no cost to use the service, and may be used both commercially and non-commercially. Users must inform the resource if it is redistributed within a computer application. Allyson Lister https://uts.nlm.nih.gov/license.html, accessed 13 July 2016.