SecurityMod
Welcome to the world of protected construction!
The SecurityMod modification radically changes the approach to protecting your buildings in Minecraft. This addon provides specialized blocks that cannot be destroyed by other players. Access to them is available only to you or those whom you have granted special access rights.
Main mod features

Reinforced blocks — the foundation of the security system. These indestructible obstacles can only be removed with a special tool — the Block Breaker, which can only be used by the owner.
Safes come in two versions: standard and advanced. They function like reinforced blocks but are additionally equipped with storage. The safe's inventory can be opened either by its owner or by someone with the corresponding key.
Protected door operates on a similar principle. Opening and closing this structure is available exclusively to the owner. A key allows granting temporary access to other participants.

Access management tools
Key — a multifunctional tool for granting rights. Simply right-click on the desired block, then select the player to grant access rights. Each key is bound to a specific object and person. Placing it in a crafting table clears all key data.
Owner changer — a unique item for administrative needs. Cannot be crafted. Applying it to any protected block transfers ownership rights to you.
Universal master key — a tool for complete control, unavailable for creation through normal means. It allows interaction with ANY object of the modification. Even without ownership rights, the functionality remains accessible.