Debhelper is written by and copyright 1997-2003 Joey Hess <joeyh@debian.org>.

Increasinly miniscule parts of the code (and certainly my inspiration from the
whole thing) came from debmake, by Christoph Lameter <clameter@debian.org>.

Some of the dh_md5sums command is from a program by Charles
Briscoe-Smith <cpb4@ukc.ac.uk>.

dh_perl is by Brendan O'Dea <bod@debian.org>.
dh_python is by Josselin Mouette <josselin.mouette@ens-lyon.org>.
dh_installcatalogs is by Adam Di Carlo <aph@debian.org>.
dh_scrollkeeper is by Ross Burton <ross@burtonini.com>.
dh_usrlocal is by Andrew Stribblehill <ads@debian.org>.
dh_installlogcheck is by Jon Middleton <jjm@debian.org>.

The copyright of this package is GPL, version 2 or later. Files in the
examples/ directory are in the public domain[1]. On Debian systems the
complete text of the GPL is in /usr/share/common-licenses/GPL

[1] Pendants who belive I cannot legally say that code I have written is in
    the public domain may consider them instead to be licensed as follows:

    Redistribution and use in source and binary forms, with or without
    modification, are permitted under any circumstances. No warranty.