Originally Posted by rashkae
Why would you want to do something like this? I know it takes a bit more space, but if you're going to edit the epub, why not just embed the fonts properly?
Another reason is that if you're creating your epubs with Calibre you can copy all the necessary @font-faces into the Look&Feel - ExtraCSS box in Preferences and they will all be automatically placed into the epub as part of the conversion to epub process. Fully embedding the fonts is still a manual process.