LICENSE.txt

The Ruby plugin is licensed under the LGPL version 2.1 found below 

The jruby library's License is included in 
lib/jruby-complete.jar:/META-INF/LICENSE.txt.

The demo gems bundled in the gems folder have each a license of
their own. The gems make their license available in their respective
folder in gems/gems/<gem_name>-<gem_version> 

----------------------------------------------------------------------

                  GNU LESSER GENERAL PUBLIC LICENSE
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That's all there is to it!