This is realpath, previously part of the dwww package, which is now maintained
by Robert Luberda <robert@debian.org>
Original author and first dwww maintainer is Lars Wirzenius <liw@iki.fi>.
Former maintainer was Jim Pick <jim@jimpick.com>.

realpath is free software.  You may copy it according to the
GNU General Public License, version 2. A copy of the license
is not included, but you can get one from most FTP sites that
have GNU software, for example, ftp.gnu.org.

On a Debian GNU/Linux system, the GPL can be found as
/usr/share/common-licenses/GPL .