Freedom Issue #3244
[brutalchess] Potentially nonfree fonts
The project itself has a libre license, but the fonts directory has no licenses for each font.
I strongly suspect they are nonfree, especially because the origin of the fonts are not documented, and a quick web search could not find the source for them under libre licenses.
Ghostwri.ttf appears to be the Ghostwriter font, and a quick web search yielded no results with a libre license.