You may use/modify my code in pretty much any way you want, with the following restrictions:
- You may not distribute my original code, or barely modified versions.
- If you distribute versions with added features (i.e. changed how islands are laid out), you must reference my original plugin.
- You may not claim you created the plugin, however you can say you modified it to have extra features.
- You may not gain income from links to either my original plugin, the source code, modified versions, etc.