Now, I know what you're thinking. You're thinking this is just like any other vanilla grief protection system out there. You have to get an admin to set up a bunch of command blocks at spawn for you for it to be protected, and you need an admin if you want to add someone to your plot. Well, that's where you're wrong. My system, GriefDenial 2.0, allows any and every player to create 3 protections. Every protection will protect all blocks in a 30-block radius. That includes from TNT, too. It also allows you to add a player to your plot. Unfortunately, you can only add one, but it's better than nothing! A player can easily create a protection simply by placing a glass block and throwing an iron block (item) on top of it. It will set itself up and tell you it has been successfully created. The glass will turn blue and an iron block will appear on top of it. If the owner (and only the owner) right-clicks this iron block, it will explain how to add a player, something I will not do here. You're probably wondering how you can get such an awesome thing into your world. It has to be complicated for something this amazing, right? Wrong. All you need to do is import the MCEdit schematic, for which a download link will be below. After that, go into your world, click the "Auto-setup / Reset" button, then press enable. It will do everything else for you! Note that this may cause some lag on a given server. The "Auto-setup / Reset" button will set up all the variables, and it will destroy all existing claims if it's already set up. If you like this idea, please share it with others! I'm not fully sure all of it works, so I need people to test it for me. I built it all in singleplayer.