That was my difficulty as well. I can't seem to find the third party licenses in the documentation (https://www.tecgraf.puc-rio.br/iup/). I have also checked the various "COPYRIGHT" and "README" files and can't find anything either. It would be useful to have the "Overview" documentation that reads, "IUP is free software, can be used for public and commercial applications." also mention to go to the "Copyright/License" section for the some exceptions. Then within the "Copyright/License" section of the documentation it could list the third party licenses.
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