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+title: Code reuse
+parent: FAQ
+---
+
+# Can I use Nagios Plugins in my project?
+
+Firstly, there is a distinction between a Nagios plugin and plugins from the
+Nagios Plugins project.
+
+Although Nagios (the system) is licensed under the GPL, plugins are executed
+in their own environment, so they [do not fall][aggregation] under the "viral"
+aspect of the GPL.  Therefore, any plugin written for use by Nagios can be
+under any license the copyright holder selects.
+
+However, the plugins contained within the Nagios Plugins project are
+distributed under the [GPL][gpl].  If you distribute an application that
+includes the Nagios Plugins (modified or not), you are required to distribute
+a copy of the source code for the plugins under the terms of the GPL,
+regardless of the licensing for the rest of the application.
+
+If you write a plugin which is a derivative work from code of the Nagios
+Plugins project, then your plugin must also be licensed under the GPL,
+although you own the copyright for your modified portions.
+
+*Derivative work* usually includes:
+
+* modified versions of the plugins
+* other software that contains code (modified or not) copied from the plugins
+* other software that `#include`s header files from the plugins
+* other software that has linked against library files from the plugins
+
+and does not usually include:
+
+* other software that parses the output of a plugin run from the command line,
+  exit status, etc.
+* software that provides a "wrapper" for command line execution of the plugin
+* software that uses status codes and other values which are in the header
+  files, but also described in the documentation (though not including or
+  linking to the source)
+
+[aggregation]: http://www.gnu.org/licenses/gpl-faq.html#MereAggregation "GPL FAQ: Mere Aggregation"
+[gpl]: http://www.gnu.org/licenses/gpl.html "GPLv3"
+
+<!--% # vim:set filetype=markdown textwidth=78 joinspaces: # %-->