[NTG-context] embed fonts

Hi all, this seems like a very basic question, but I haven't found anything on the wiki and in the archive: I'm typesetting a book with mkiv, and the printer wants all fonts completely embedded. I knew how to do this in mkii, but what about mkiv? (Btw, I'm using \enableprotruding and \enableadjusting, would this make any difference for embedding the fonts?) Thanks, and all best Thomas