The bPermissionsGUI server uses packages built from the bukkit project, please check there for applicable licenses.

http://bukkit.org

The bPermissionsGUI client uses org.simple.json packages.

These are licensed under the Apache license.

http://www.apache.org/licenses/LICENSE-2.0

The rest of bPermissionsGUI client is licensed under the AOL license.

http://aol.nexua.org