DJ Bernstein recently placed a bunch of his tools under the public domain. Not all of them have been updated in their license var. They probably all should have LICENSE="public-domain" inside. sys-process/daemontools net-dns/djbdns sys-apps/ucspi-tcp (maybe others?)
so change it ...
I was only aware of qmail. Do you have links for his announcements on the rest?
http://cr.yp.to/distributors.html And a bunch of older tools from him already were public domain (stated in source files) but not marked as such. I just started to apply the changes.
all done