has clause has website homepage GNU Project Free License Type Copyleft Attribution required Vendor-specific License IUPAC/InChI-Trust InChI Licence No. 1.0 http://www.inchi-trust.org/wp/wp-content/uploads/2014/06/LICENCE.pdf IUPAC/InChI-Trust InChI Licence No. 1.0 is a vendor license which allows all users to make use of the resource, including the source code, for free, as long as its source is properly attributed. It is broadly compatible with the GNU GPL v3 and v2 in that it states in the license that you can change the license from this one to the GNU GPL if you wish. http://www.inchi-trust.org/wp/wp-content/uploads/2014/06/LICENCE.pdf, accessed 12 July 2016 Allyson Lister IUPAC/InChI-Trust Licence for the International Chemical Identifier (InChI) Software version 1.04 Distribution with notices