A friend of mine works for a large input-device company, and they are looking to get into the desktop videoconferencing business. Their current business is extremely competitive on price, and they'd like to do something in desktop videoconferencing that would distinguish them from everybody else. Naturally, I suggested cryptography. I have always thought that the biggest problem introducing crypto to phone conversations was the large amount of cpu speed and software complexity to digitize the audio; that adding the crypto code is relatively minor. Certainly RC4 and IDEA for instance, run very fast. In videoconferencing applications, this audio compression is already being done, so adding the crypto should be almost free. Well, except for licensing costs. I'd really like to use Diffie-Hellman to negotiate a key. Does anyone know how much it would cost to license that from PKP? I'd expect that there would be a one time fee, plus a per-copy-sold fee. Does anybody know - and if so, can they say - if anybody else has added or is adding cryptography to their videoconferencing systems? It seems like such a killer ap that I must be overlooking something. thad -- Thaddeus Beier email: thad@hammerhead.com Technology Development vox: 408) 286-3376 Hammerhead Productions fax: 408) 292-8624