Use this plugin to prevent people to use your commands..
EditAble in commands.yml
Know bugs: None
How To Install.
Download PluginBlocker.jar and move it to your \plugins\ Folder
and restart your server.
IMPORTANT! : First time you run server with PluginBlocker it will give you an error and after reloading it will be fixed,it has to make a Commands.yml file
all commands are editable in Commands.yml Reload your server and it will be added..