Ok so here is what it is.
A mod that if a player is non-admin they can only save their OWN BRICKS, so they can't steal.
And if they are admin and have this mod they can choose to save all bricks or hit a button to choose to only save their own bricks.
Use: Building something very big and you wan't to showcase it but some noob comes in and steals it, but with this mod it would not let them steal it.
Use 2: You are building a big project on a Freebuild but you dont want to save other crap that you have to go back and load in single player and d-wand the rest and save again.
This should have really been in the game from the start.