Overall a badly written and glitchy plugin. For example, it compiles regex on every inventory move event, which is called on every hopper transaction. This leads to bad performance. This regex also means it breaks with floodgate users. Additionally, this plugin is not compatible with towny. Players can lock chests in other player's towns, which is a huge issue and happens multiple times a day. Overall, just use this better written plugin instead:
https://www.spigotmc.org/resources/lwc-extended.69551/