As a side note, djbdns (and related programs) are now all under the public domain (finally!).
I hadn't heard that good news until today. :)
"What are the distribution terms for djbdns?
2007.12.28: I hereby place the djbdns package (in particular, djbdns-1.05.tar.gz, with MD5
checksum 3147c5cd56832aa3b41955c7a51cbeb2) into the public domain. The package is no longer