Type foundries aren't keen on fonts-for-the-web because that means distributing the whole font file to untrusted clients (Flash and PDF solves this by only exporting the subset of the typeface that's actually used) where font piracy can conceivably happen (font piracy is a very real problem for foundaries, especially given the low value most users attach to a typeface (I certainly don't feel like paying the printed price for most typefaces for sale) so I'm curious as to how this will pan out.
Fortunately type houses are more forward-thinking than the music industry, but I'll hold my breath. Though I can see this being abused by lyrics websites (who are contractually obligied to "protect" lyrics) by for example using a font that implements Ceaser's cipher or a kind of one-time pad, thus copying and pasting lyrics from websites would be impossible since the actual text would only be revealed by using the right font.