PermaFences

Your fences are indestructible!

Source | Permissions

Features:

• Can't break fences, can't burn fences, can't blow up fences
  
• Fire disappears when placed/spread near fences
  
• TNT disappears after exploding when near fences (It's the only way I could think of)
  
• Creepers disappear (after exploding) when near fences (I "might" allow creepers to blow fence up)
  
• Pistons can't push or pull fences!
  
• OP's can break fences with Gold Pickaxe