What license is the code distributed under?
The Monitoring Plugins code is currently distributed using the GNU General Public License, Version 3 (GPLv3).
This is because some C code that we depend upon, from the Gnulib project, is distributed under the GPLv3; and therefore, some of our plugins also need to be GPLv3 licensed. The team has decided, rather than having a mixed license, we'll distribute all of the core Monitoring Plugins code under the GPLv3.