In the case of a commissioned typeface, where I'm supplied the glyphs in the form of a PSD file, how would you determine and define what copyrights are mine and what are the clients?
I think, obviously, the glyphs are the clients. So are the outlines, I'd say, though, technically, I made the outlines from image files, plus I made a few minor adjustments to a small handful of glyphs and, I drew some alternates to preserve the hand made appearance. Still, I think that's the client's. Everything else that makes it a functioning font is mine.
I've spelled that division out in two clauses. One stating that I assert the my right to ownership of the intellectual property contained in the font, excluding the graphic content, I.e., the characters supplied by the client and another clause stating that the client owns the rights to graphic content.