Having read the slashdot.com article on the pulled SDMI paper, I'm starting to wonder if it would be possible to reduce the information required to remove the watermarks from a SDMI track into a couple of formulas, or a few lines of C/LISP/Haskell/something? If it were, we could distribute PNGs of them, print them on shirts etc, much like the css-auth thing and strong encryption before that. The paper is pretty long for printing on a shirt, after all.
Heh. Now all we need is CipherSaber, only for SDMI. Oh, and they'd need to start actually releasing stuff for SDMI too, for full effect.