Added a feature to lock your username with your IP when you first join the server and type in the password. If your IP changes, you have to re-type it. Your link between does get cleared each restart or reload though. This option is also configurable in the config, if you would not like this.
Updated to 1.3.1 (Fixed the AsyncPlayerChatEvent)
1.1 -
Fixes blocking of all commands when you haven't typed in the password.
Adds an argument to the main command to change the password from in-game. (/opprotect change <password>)