A DefineFontName tag is used to complement the definition of a DefineFont tag. It uses the exact same id (f_font_name_id_ref = f_font_id). You must have the corresponding font definition appearing before the DefineFontName since it needs to be attached to the DefineFont tag.
The f_font_name_display_name is the legal name of a font. This name cannot be used to load a corresponding system font.
The f_font_name_copyright string represents the font license.