COPYING.txt for "tuxpaint-ttf-thai"
Thai TrueType Font (TTF) for Tux Paint

The "th.ttf" font file is a copy of a "Garuda, Bold" TrueType font,
(Garub.ttf).

It was extracted from the Debian package "xfonts-thai-ttf",
the "Thai TrueType fonts from NECTEC" collection,
packaged for Debian by Chanop Silpa-Anan <chanop@debian.org>.

From the description:
  This package provides some public domain TrueType fonts from NECTEC. These
  fonts come from the project "Font of Thailand".