How do i make an override?

[Wesley_Dude_Bro]

shows how you make some blocks unbreakable, but idk how to make a override perm like "override.nobreak" is what i want, Pls respond if you can, thanks!

[PrecedingMC]

You can use something like this (edit: fix the indentation, should be easy):

on break of <block type>:
    if player does not have permission "your.permission":
  		cancel event
  		message "&cYou cannot break this block."
  	

Edited April 10 by PrecedingMC