Most of the code is in this plugin is released under a simple, permissive, BSD3 style license. A couple of fragments of the code (because they were borrowed from the Eclipse platform) are released under the Eclipse Public License. What this effectively means is that if you want to redistribute this plugin yourself, you need to be prepared to also redistribute the source for at least those components which are released under the Eclipse Public License (since those are the terms of the EPL, as I understand them). Alternatively, you could rewrite and eliminate the source modules that are released under the EPL.

Copyright and license information can be found in the release package. The release package contains both the plugin and all the necessary source code.