If your key says “Do Not Duplicate”, it is reasonable to ask whether copying it is illegal.

The short answer is that the stamp alone does not give a simple legal answer.

A “Do Not Duplicate” marking may be used on a standard key as a warning, or it may appear on a key that is part of a restricted key system. Those are not always the same thing.

In practice, the more important question is not only whether the key can be physically copied. It is also whether you are authorised to request another key, whether the key belongs to a building or site access system, and whether approval is needed before another copy is issued.

This article is general information only and is not legal advice. For the practical copying question, see can you copy a key that says Do Not Duplicate?.

Quick answer

A key stamped “Do Not Duplicate” should not be assumed to be freely copyable.

The stamp may be a warning that the key owner, building manager, property manager, owners corporation, employer or site manager does not want unauthorised copies made.

Some keys with that stamp are still standard keys. Others are restricted keys where copies are supplied only through an authorised locksmith or supplier.

Whether a copy can or should be made depends on:

  • the type of key
  • whether the key blank is available
  • whether the key is part of a restricted key system
  • who owns or manages the property
  • whether approval is required
  • whether the key gives access to shared or managed areas
  • any agreement, lease, workplace rule or site access process that applies

If the key belongs to a property, workplace or building you do not own or manage, do not assume you can copy it just because you physically have the key.

Important: Possession of a key is not the same as authority to order another one. For restricted or building-managed keys, the safer path is to follow the authorised ordering process.

Why the stamp alone does not tell the whole story

A “Do Not Duplicate” stamp is usually intended to discourage casual copying.

It may be placed on a key by:

  • a locksmith
  • a landlord
  • a property manager
  • a building manager
  • an owners corporation or strata manager
  • an employer
  • a school
  • a facility manager
  • a site owner

But the wording on the key is only one part of the issue.

A key could be:

  • a normal house key with a warning stamp
  • a key for a rental property
  • an apartment building key
  • a workplace key
  • a school or commercial site key
  • part of a master key system
  • a genuine restricted key that requires approval before copying

Those situations should not be treated the same way.

For more detail, see can you copy a key that says Do Not Duplicate?.

Do Not Duplicate key vs restricted key

A “Do Not Duplicate” key and a restricted key are often talked about together, but they are not always the same.

A Do Not Duplicate key may simply be a standard key stamped with a warning.

A restricted key is usually part of a key system designed to limit how keys are issued. The correct blank may not be available to general retailers, and an authorised locksmith or supplier may need to confirm approval before making another key.

Restricted key systems are designed to improve security by helping the people responsible for a building or site control and record who has keys.

In an Australian locksmith industry context, the Locksmiths Guild of Australia Code of Practice describes restricted key procedures as including records of keys cut, the identity of people receiving them, controlled access to electronic records and secure storage of restricted key blanks.

For more background, see what is a restricted key?.

Why some keys need approval before copying

Some keys need approval because they provide access to more than one person’s private space.

This is common for:

  • apartment buildings
  • commercial buildings
  • workplaces
  • schools
  • factories
  • warehouses
  • shared facilities
  • owners corporation or strata buildings
  • master key systems
  • sites with staff, contractors or tenants

Approval helps make sure that keys are only issued to people who should have them.

It also helps keep records accurate, including:

  • who requested the key
  • who approved the request
  • how many keys have been issued
  • who collected or received the key
  • which areas the key can access
  • what happened when a key was lost or replaced

If keys are copied without approval, those records may no longer match reality.

For more detail, see why restricted keys need approval.

Why copying without approval can affect security

A restricted key system is not only about the key itself.

It is also about the process behind the key.

When a building, workplace or site uses restricted keys, the aim is usually to improve security and safety by limiting who can receive keys and keeping a record of those keys.

If a key is copied outside the authorised process, the building manager, owners corporation, property manager, employer or site owner may lose track of who can access the site.

That can create problems such as:

  • more keys existing than expected
  • missing or inaccurate key records
  • keys held by people who were not approved
  • uncertainty after a tenant, employee or contractor leaves
  • difficulty responding when a key is lost
  • weaker control over shared or sensitive areas

This is why restricted keys are usually handled through a proper approval and ordering process.

What if it is your own house key?

If it is your own standard house key, and you own the property, the situation may be simple.

A locksmith or key-cutting service may be able to advise whether the key can be copied.

However, if the key says “Do Not Duplicate”, it is still worth asking why it was stamped that way. It may have been part of an old rental arrangement, a previous owner’s system, or a restricted key system you were not aware of.

If you are unsure, ask a qualified locksmith to identify the key type.

What if it is a rental property key?

If the key is for a rental property, do not assume you can copy it without permission.

Your lease, property manager or landlord may have rules about spare keys and replacement keys.

There may also be a reason the key was stamped “Do Not Duplicate”, especially if it gives access to shared areas, a building entrance, garage, mailbox area or common facilities.

The safest path is to ask your property manager or landlord how replacement or spare keys should be ordered.

What if it is an apartment key?

Apartment keys often affect more than your own front door.

They may also provide access to:

  • building entrances
  • common areas
  • lifts
  • car parks
  • garages
  • storage areas
  • mail rooms
  • service areas

Because these areas are shared, apartment keys often need to be managed carefully.

The approval process helps protect residents, tenants, owners, visitors and contractors by keeping better control over who can access the building.

Depending on the building, approval may need to come from the owners corporation manager, strata manager, building manager, property manager, lot owner or another authorised person.

For more detail, see how to order an apartment key.

What if it is a workplace or school key?

Workplace and school keys should not be copied casually.

They may provide access to offices, classrooms, storerooms, plant rooms, staff areas, equipment, records, restricted rooms or shared building areas.

If you are an employee, contractor, teacher, student, volunteer or tenant, ask the person responsible for site access before attempting to copy the key.

That may be:

  • your manager
  • the site manager
  • the facility manager
  • the office manager
  • the business owner
  • the school administrator
  • the security team
  • the property manager

The purpose is not just to make the process harder. It is to help the organisation know who has access to the site.

Can Bunnings or a kiosk copy it?

Bunnings, hardware stores and self-service kiosks may be able to copy many standard keys.

A Do Not Duplicate or restricted key may be different.

They may not be able to copy it because:

  • the correct key blank is unavailable
  • the key profile is restricted
  • the key is part of a managed building or site system
  • the key-cutting service declines to copy marked keys
  • approval is required before another key can be supplied

Some keys also require special procedures before duplication. The same industry code specifically notes that keys marked “MASTER”, “GMK” or “MK” require identification and authorisation before duplication.

For more detail, see can Bunnings copy a Do Not Duplicate or restricted key?.

Where can you get the key copied properly?

If the key is restricted or belongs to a managed building or site, the correct path is usually to order it through the authorised locksmith or supplier.

Start by asking:

  • the building manager
  • the owners corporation manager
  • the strata manager
  • the property manager
  • the landlord
  • the lot owner
  • the facility manager
  • the site manager
  • the employer
  • the locksmith named on the key or paperwork

For more detail, see where can I get a restricted key copied?.

What to do instead of copying it casually

If your key says “Do Not Duplicate”, a safer process is:

  1. Check what property, building or site the key belongs to.
  2. Work out whether it is a normal key, building key, workplace key or restricted key.
  3. Ask the responsible person who can approve a replacement or additional key.
  4. Find out which locksmith or supplier is authorised to issue it.
  5. Submit the required details.
  6. Wait for approval if approval is required.
  7. Arrange payment, collection or delivery.

For the general process, see how to order a restricted key. If you need to identify the correct supplier, see where can I get a restricted key copied?.

Why online ordering can help

Do Not Duplicate and restricted key requests can become confusing when the process relies on paper forms, emails and phone calls.

A structured online process can make it clearer:

  • who requested the key
  • which key is being requested
  • which building or site it relates to
  • who needs to approve it
  • whether approval has been received
  • whether payment is required or complete
  • whether the key is ready for collection or delivery
  • what record exists of the order

Online ordering does not remove the need for approval. It helps make the authorised process easier to follow.

Where KeyOrders fits

KeyOrders is being developed to help locksmith businesses manage restricted key requests through a structured online ordering and approval workflow.

It is designed to help locksmiths collect request details, manage authorised approval, track payment status, record fulfilment information and keep clearer order records.

For locksmiths, this can reduce manual follow-up and make restricted key orders easier to review and action.

For customers, tenants, property managers, building managers and authorised signatories, it can make the process clearer and easier to understand.

Summary

A “Do Not Duplicate” stamp does not always give a simple legal answer.

Some stamped keys are standard keys with a warning. Others are restricted keys or building access keys that need approval before another copy can be supplied.

If the key belongs to a property, workplace, apartment building, school or managed site that you do not own or manage, do not assume you can copy it without permission.

The safest path is to find out who manages the key system, ask whether approval is required, and order the key through the authorised locksmith or supplier.