A blueprint for building security is a master key system schematic. It translates a vision to both allow and restrict access to property, much like an architect's drawing. Any system that provides different "access levels" must be tailored to the specific security needs of the building (or groups of buildings) where it is installed.
A diagram resembling a genealogical family tree or a corporation's organisational chart is produced by using time-honored symbols and abbreviations, such as MK for Master Key and GGM for a Great Grand Master key, to communicate which keys will operate which lock, or set of locks. This schematic, like a building blueprint, is used to communicate how the system will be used.
A Master System's keys
From least access to most access:
Change Key - A sub-master key is another name for this key. It will only open one lock and only locks that are identical. The lock that the change key opens will also be opened by the master key and any key higher in rank.
Master Key - Without a master key, a lock only has one key. This is the key required to convert a simple lock into a master keyed lock. In some systems, this will be the most important key. A master key may be abbreviated to 'MK' in the trade.
A grand master key is used to gain access to multiple master key systems. This key will open all master systems and subsequent change keys within those systems. A master key may be abbreviated to 'GMK' in the trade.
Great Grand Master Key - The great grand master key will open all the grand master key systems beneath it, as well as the master key systems and change keys beneath those.
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