I just received a very informative package of information from Bob Fougner at Cylink, which, in addition to a copy of the relevant patents and hardcopy of the materials available on their web page, contains a "limited time offer" to license their patents in one of three ways: 1) Practice of DH Key exchange & DSS: $50,000 2) Right to use & distribute RSA: $62,500 3) Ulimited field of use to practice public key: $75,000 Those interested in obtaining this information should probably fax him at 408-735-6642 with a request for the info. Much of the information is available online at: http://www.cylink.com. Obviously, anyone wishing to practice RSA would also need to get a license from RSADSI. Also, it is my impression that are claiming Hellman-Merkle as the precursor patent to RSA, which means that this situation will prevail at least through late 1997, not early 1997 (when Hellman-Diffie expires.)