> I really don't know; most public-key stuff seems to be controlled in
> some way by RSA, and I don't know enough about the Diffie-Hellman
> stuff to know if it falls under the RSA patents, or if it is even
> secure enough to be considered as a replacement for RSA should it
> *not* fall under the patents. (Nor do I know if it is covered by
> patents in other countries or falls under export/import restrictions.)
If memory serves, the patent on Diffie-Hellman expired last year.