All fonts were downloaded from http://www.gust.org.pl/projects/e-foundry/tex-gyre/whole in .otf format and converted to .ttf format using FontForge ( http://fontforge.sourceforge.net/ )
The license can be found here: http://www.gust.org.pl/projects/e-foundry/licenses

The 'TeXGyre' text was also removed from the font file name to keep the name short for use with CE Image.