So this is a tiny plugin that depends on PlotSquared.
It allows protecting plots without permissions. I use it on my dev server (dev.ac3-servers.eu) to prevent other developers and admins building on my plots and the spawn.
Shows the command help and all relevant commands.
To configure the plugin, all you really need to change is the default password in the config.
This plugin is made to be as basic as can be. The source code is on GitHub.
Code (spiget-extra (Unknown Language)):spiget:opt-out=true