"The Catharon Open Source LICENSE" is seen in scummvm
And also here:

• https://github.com/scummvm/scummvm/tree/master/engines/ags/lib/freetype-2.1.3/autohint
• https://www.copperspice.com/docs/cs_overview/legal-3rdparty.html
• https://github.com/scummvm/scummvm/blob/master/LICENSES/CatharonLicense.txt
• https://github.com/search?q="The+Catharon+Open+Source+LICENSE"&type=code

A current home page does not seem to exist

With this notice:

This file is part of the Catharon Typography Project and shall only be used, modified, and distributed under the terms of the Catharon Open Source License. By continuing to use, modify, or distribute this file you indicate that you have read the license and understand and accept it fully.