Licence Authenticity & Seller Verification

WinCDKey is a marketplace. We do not manufacture or issue software licences — Microsoft and other publishers do. Our role is to vet the sellers listed on this platform, require each of them to declare the licence channel behind every listing, and stand behind your purchase with a replacement guarantee if a key fails to activate. This page explains exactly how that works, what each licence type means, and what we can and cannot promise.

The short version

Sellers are independently vetted before they can list. See our verification process.
Every listing declares its licence channel — Retail, CSP, OEM or Volume. See what each means.
You get a 90-day replacement guarantee from the date of purchase.
If anything is unclear on a listing before you buy, open a ticket and ask. We would rather answer than have you guess.

How the WinCDKey marketplace works

WinCDKey operates as a marketplace rather than a single-seller shop. Independent sellers list software licences on the platform, and we provide the storefront, the checkout, the support layer and the guarantee that sits over every transaction.

That distinction matters to you as a buyer for one practical reason: the seller behind a listing determines where that licence came from. Two listings for the same product can be sourced through completely different channels, carry different transfer rights, and behave differently if you change your hardware. This is why we require channel disclosure on every listing rather than presenting all keys as interchangeable.

WinCDKey Ltd is registered in England and Wales (Company No. 15530488), at 71–75 Shelton Street, Covent Garden, London, WC2H 9JQ. Our full trading terms are set out in our Terms & Conditions, and our data handling in our Privacy Policy.

Who you are buying from

Each product page names the seller of record for that listing. Where a seller other than WinCdkey Ltd is the contracting party, that is stated on the listing before you complete checkout, along with their trading identity. If you cannot see a seller identity on a listing, treat that as a reason to ask us before buying — not a reason to assume.

[VERIFY: this paragraph must match your actual checkout. If WinCdkey Ltd is currently the seller of record on every transaction and no vendor identity is displayed pre-purchase, this section is inaccurate as written and must either be changed or the checkout must be changed to match it. See the pre-publication notes.]

How we verify sellers before they can list

Sellers apply through our vendor application and are not able to list until verification is complete. Our checks cover four areas.

1. Legal identity

We require registered company details, a verifiable trading address, and a named contact. Sole traders and unregistered sellers are not accepted. This is the check that most low-cost key sites skip entirely, and it is the reason buyers on those sites have no recourse when something goes wrong.

2. Channel documentation

Sellers must document how they obtain the licences they intend to list, and provide supporting evidence for the channel they claim — distributor agreements, partner authorisations, or purchase documentation as applicable to that channel. A seller who cannot document a channel cannot list under that channel label.

3. Test purchases

Before a new seller goes live, our team places test orders and activates the keys ourselves. A key that fails activation, activates into the wrong edition, or reports an unexpected licence type at the activation stage means the listing does not go live.

4. Ongoing monitoring

Verification is not one-off. We track activation-failure rates and support tickets per seller. A seller whose keys begin failing is suspended pending investigation, and their listings are removed while that runs. In practice this is the check that does the real work — sourcing problems almost always show up as a rising failure rate before they show up anywhere else.

[VERIFY: only publish the four checks you actually perform. Describing a verification process you do not operate is a consumer-law problem in the UK and EU, and it is the single most likely paragraph on this page to be tested if a dispute escalates. Delete any check you cannot evidence.]

Licence channels explained

Every Microsoft licence reaches an end user through one of a small number of channels. The channel is not a marketing detail — it determines whether you can move the licence to a new computer, whether it is tied to a Microsoft account, and what happens when you upgrade your hardware.

Channel	What it is	Transferable to a new PC?	Typical use
Retail (FPP)	The full packaged product channel, sold to consumers through retail distribution.	Yes — can normally be moved to a replacement machine after deactivation on the old one.	Individual buyers who may change hardware.
OEM / System Builder	Licensed for distribution installed on hardware by a system builder.	No — permanently tied to the first machine it activates on.	Pre-installed on a new PC.
CSP Perpetual	On-premises perpetual software bought through the Cloud Solution Provider programme under a Microsoft Customer Agreement.	Governed by the customer agreement, not by the key itself.	Businesses buying through a partner who manages the relationship.
Volume (MAK / KMS)	Multi-seat licensing issued under an organisation’s volume agreement.	Tied to the organisation’s agreement.	Organisations deploying at scale.

Why OEM keys are cheaper — and what you give up

An OEM licence costs less because it carries fewer rights, not because someone found a discount. It is bound to the first system it activates on. If your motherboard fails and is replaced, that licence does not travel with you, and Microsoft support for an OEM licence sits with the system builder rather than with Microsoft directly.

That is a legitimate trade-off if you are buying for a machine you do not expect to replace soon. It is the wrong purchase if you build or upgrade regularly. Our listings state which is which so you can make that call before paying, rather than discovering it eighteen months later. If you are unsure which applies to you, our FAQs and Help & Support Centre cover the common scenarios.

Term-based versus perpetual

Not everything sold here is a one-time purchase. Microsoft 365 and Office 365 products and all Autodesk software are term-based subscriptions with a defined licence period. Office 2024, Office 2021 and earlier standalone editions are perpetual. Any listing that describes a subscription product as “lifetime” is mislabelled — tell us and we will correct it.

What every listing must tell you

We require each listing to state five things before you buy. If any of them is missing from a product page you are looking at, that page is non-compliant with our own standard and we want to know about it.

Licence channel — Retail, OEM, CSP or Volume.
Licence term — perpetual, or the subscription period in months or years.
Device count — how many machines the licence covers.
Activation method — online, or phone activation requiring a confirmation ID.
Region — global, or restricted to a specific region.

Region matters more than most buyers expect. A licence issued for one region may refuse to activate elsewhere, and that is a licensing restriction rather than a fault. Where a listing is region-limited, it says so.

How to check your licence yourself

You do not have to take our word for any of this. After activating, you can confirm what you actually have in under a minute.

Check your Windows licence channel

Open Command Prompt as administrator.
Run slmgr /dli
A dialog shows the edition and the licence channel — Retail, OEM, or Volume.

Check your Office licence

Open any Office application.
Go to File → Account.
The product name and licence type are shown under Product Information.

If what you see does not match what the listing said, that is a valid reason to contact us and we will treat it as a mis-description, not a change of mind. Raise it through Open a Support Ticket and include a screenshot.

For step-by-step activation help across products, see our Installation & Activation Guide. For phone-activation SKUs, use the Confirmation ID tool.

Your replacement guarantee

Every licence purchased through WinCDKey carries a 90-day replacement guarantee from the date of purchase. If your key fails to activate, or stops working within that window for a reason attributable to the licence rather than to your own system, we replace it.

What that covers:

A key that will not activate on first use.
A key that deactivates within 90 days for a licence-side reason.
A licence that does not match its listing description.

What it does not cover:

Hardware changes on an OEM licence — that is the licence working as designed, not a fault.
Activation failures caused by a mismatched Windows edition on your machine.
Issues raised after the 90-day window has closed.

Refunds are handled under our Refunds & Returns Policy, and your statutory rights under UK and EU consumer law are unaffected by anything on this page. EU buyers can also read our EU Law & Authentication page.

[VERIFY: the 90-day figure must be identical here, in Refunds & Returns, in the product page tabs, and on the trust badges. There is currently a “Lifetime Product Guarantee” badge on product pages that directly contradicts this. Fix the badge before this page goes live, or this page becomes evidence of the inconsistency rather than a fix for it.]

What we do not claim

Trust pages in this industry tend to overclaim, so it is worth being explicit about the limits.

We are not Microsoft, and we are not an extension of Microsoft. We do not issue licences, we cannot override a publisher’s activation decision, and we cannot guarantee that a publisher will never change how a given licence behaves.

We also do not claim that every seller on this platform holds direct authorisation from every publisher whose products they list. What we do claim is narrower and checkable: that we verify seller identity, require documented channel disclosure, test before listing, monitor activation failures, and replace licences that fail within 90 days.

If that distinction costs us a sale to someone who wanted a bolder promise, we would rather lose it than make a promise we cannot keep.

Why buyers choose WinCDKey

Over 400,000 regular customers and more than 600,000 orders fulfilled.
More than 2,500 verified reviews on Trustpilot.
Delivery by email, usually within minutes of payment clearing.
Human support through our Help & Support Centre.
Volume and reseller pricing via B2B & Wholesale and Enterprise Licensing.

Track an existing order through Order Tracking or My Account. Read more about the company on our About Us page.

Frequently asked questions

Are WinCDKey licences genuine?

The keys sold on this marketplace are publisher-issued licence keys, not generated or counterfeit codes. Every seller is verified before listing and we test-activate keys ourselves before a new seller goes live. If a key you receive fails to activate, our 90-day replacement guarantee applies.

Why are the prices so much lower than buying direct?

Three reasons account for most of the difference. Digital delivery removes packaging, shipping and retail margin. Different licence channels carry different rights, and lower-rights channels such as OEM cost less. And sellers competing on a marketplace price against each other rather than against a single recommended price. Where a low price reflects reduced rights, the listing says so.

What is the difference between a Retail and an OEM key?

A Retail licence can normally be moved to a replacement computer after being deactivated on the old one. An OEM licence is permanently tied to the first machine it activates on and cannot be transferred. OEM costs less because it carries fewer rights, which makes it a reasonable choice for a machine you do not plan to replace soon.

Can Microsoft deactivate a key after I buy it?

A publisher can block a licence key it determines was distributed outside its terms. This is uncommon but not impossible anywhere in the resale market. Our 90-day replacement guarantee exists specifically to cover this window, and we suspend sellers whose keys show elevated failure rates.

How do I know which seller I am buying from?

The seller of record is shown on the product listing before checkout. If you cannot find it, open a support ticket and ask before completing your purchase.

Is my licence tied to my Microsoft account?

It depends on the product. Some SKUs — particularly Office for Mac editions and Microsoft 365 account products — bind to a Microsoft account permanently. The listing states whether a product is account-bound. For account-based Office 365 products, do not rely on OneDrive as your only storage location.

What happens if my key stops working after 90 days?

The replacement guarantee covers the first 90 days from purchase. After that window we cannot issue a replacement, though our support team will still help you diagnose whether the issue is licence-side or a fixable activation error on your system.

Do you sell licences for products that are no longer supported?

Yes, and we disclose it. Office 2016, Office 2019 and Windows 10 reached end of support in October 2025. Office 2021 support ends in October 2026. These products still activate and function, but no longer receive security updates. Affected listings carry an end-of-support notice.