If you've reached this page, it is most likely due to link within a font made with a trial or home edition of FontCreator. You may not use that font for commercial purposes. If you know about people selling such fonts, do let us know here!
FontCreator standard and professional do allow you to make commercial fonts, so please go to the FontCreator product page for more information. If you want to use a font that was made with FontCreator home edition, you need to contact the font designer and ask him to regenerate the font with FontCreator standard or professional edition.