COPYING

Hu-Go! is licensed under the GNU GENERAL PUBLIC LICENSE Version 2 (see 
LICENSE.gpl)

EXCEPTED

content of the file pcecd.c, which is licensed under the GPL compatible,
modified BSD license (see pcecd.c)

[File modified Feb 25 2025 as original LICENSE.gpl and LICENSE.bsd-modified are completely missing from Hu-Go 2.12 source from Zeograd website (hugo-2.12.tar.gz), however the full modified BSD license is present in pcecd.c, thus readers are being directed there for the license details]