This is the Debian GNU/Linux prepackaged version of rbldnsd. It has been packaged by Marco d'Itri . Original sources were obtained from: https://github.com/spamhaus/rbldnsd Copyright (C) 2016 The Spamhaus Project Ltd. Copyright (C) 2002 Michael Tokarev License: GPLv2+ (please see /usr/share/common-licenses/GPL-2).