A very simple plugin that allows players are able to lock objects, or blocks for free, all by using wooden signs.
When you place down an object, like a chest or a beacon. Right click it while holding a wooden sign of any kind (NOT shift right click, just normal RIGHT CLICK)
This locks the object and only allows players who you decide get to have access.
/blocklocker <line number> <text or playername> - places the specified text on the last sign you selected (right-clicked). You can only select signs on your own protections