I have done some testing and the SRC I inserted for the font is just a standard .ttf (Truetype Font) file (If you open it directly in your browser it downloads as a file called font.ttf)
what you download and get in your browser has nothing to do with what the server is able to do with it, and whther the file is called as a download url or as a linked css file may effect the processing applied by the server.
thats what php perl asp python are for.