Daniel J. Bernstein has announced during a panel discussion at the 6th SAGE days (November 10-14, 2007 in Bristol, UK) that all his future and past software will be in the public domain. The documentation of this copyright/licensing change on the djbdns site is lacking, but it appears that qmail has a new distribution page.
(direct Google Video)
Link to watch for full disclosure on distribution of DJB’s softwares:
http://cr.yp.to/distributors.html
Update! As of 12/28-29/2007, the above page has been updated to announce all the software is in the public domain!! Whee!