Mr Key Shop Discount Codes & Vouchers — November 2026

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BTS20 matches the summary table exactly — same code, same 20%, in both places. No issue with the one genuine code on this page.

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The other five automatic listings are internally consistent, with headline and detail figures matching throughout.

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The software-resale legal content is independently sourced, from the CJEU’s own published judgment and legal commentary, not from Mr Key Shop’s own marketing.

Given this is a software-key marketplace, always activate a purchased key immediately and confirm it works, rather than assuming it will remain valid indefinitely.

Use BTS20 Before the Month Ends

It expires 30 September 2026 — the only genuine code on the page, worth using while it’s live.

Confirm the Checkout Price, Not the Listing Headline

Especially for Microsoft Project 2021 — the listing states two different figures, so the checkout price is the only number to trust.

Check If You Actually Need the Newest Version

Older, perpetual-license software (like Windows 10 Pro or Outlook 2016) is often significantly cheaper than current subscription equivalents, and may suit your needs just as well.

Factor In Activation Risk When Comparing Price

A slightly higher price from a more established reseller may be worth it if it comes with a genuine guarantee against key revocation.

Test the Key Immediately After Purchase

The best “saving” is avoiding a dispute later — confirm activation works before you need the software for something important.

The Genuine Trade-Off Here

Buying directly from Microsoft’s own store guarantees a genuine first-sale license with full manufacturer support, at the full retail price — no compliance uncertainty, no revocation risk. Mr Key Shop and SCDKey both operate on the same fundamental model: reselling genuine but used or bulk-sourced licenses at a steep discount, relying on the legal exhaustion principle established by UsedSoft v Oracle, with the buyer taking on some residual risk that any specific key might not meet the legal conditions for resale. Kinguin operates as a broader open marketplace of many independent sellers rather than a single retailer, which spreads that same risk across many different, harder-to-vet sources, though it does offer optional paid protection against a bad key. If guaranteed compliance matters more than price, Microsoft’s own store is the only option that removes the uncertainty entirely.

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Buying a specific named product? Each of the six product listings shows its own automatic reduction — check the actual checkout price against the official retail price for that exact software.

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Buying something else entirely? BTS20 is worth applying for a general 20% off, checked against whatever price is already shown.

The honest caveat

Flat-£ savings on software keys are only meaningful next to the genuine current official retail price, which changes over time.

Key Takeaways

• The Court of Justice of the European Union ruled in 2012 that reselling “used” software licenses is legal, including for downloaded (not just boxed) software.
• The core legal principle is “exhaustion of distribution rights” — once a copyright holder sells a copy for a one-time fee granting indefinite use, they cannot control its resale.
• This only applies to perpetual licenses (unlimited duration) — subscription-based licenses (like most current Microsoft 365 plans) don’t qualify.
• The original licensee must genuinely stop using their own copy when they sell it on — keeping a working copy while also selling the license isn’t protected.
• This principle remains part of retained UK law, since it predates Brexit and has continued to be applied by UK and EU courts.
• Practical takeaway: the law makes resale legal in principle, but doesn’t verify that any specific key from any specific seller genuinely meets these conditions — that’s a real, residual risk every buyer takes on.

UsedSoft GmbH v Oracle International Corp, Case C-128/11 (CJEU, 3 July 2012)

Oracle sold software under agreements it called non-transferable licenses; UsedSoft acquired and resold these to third parties, who then downloaded the software directly from Oracle. The CJEU held that where a customer pays a one-time fee for indefinite use of a downloaded program, that transaction is legally a sale, not merely a license — and a copyright holder’s distribution right is exhausted upon that first sale, regardless of whether the software was delivered on physical media or downloaded.

The Two Conditions That Actually Matter

Subsequent legal analysis of the ruling identifies two specific conditions for lawful resale: the original license must have granted indefinite (perpetual) use rather than a fixed term, and the original licensee must render their own copy unusable when they transfer it — they cannot keep using the software after selling their right to it.

Society for Computers & Law — Residual Legal Uncertainty

Legal commentary following the ruling notes genuine ongoing debate over exactly what UsedSoft legitimised — the sale of the software copy itself, or the sale of the license granting access to it — and highlights that a related case, Flexsoft v Desatel (2015), extended the exhaustion principle to multiple license keys delivered specifically for resale, showing the practical scope of the ruling has continued to be tested and clarified in national courts since 2012.

How This Applies to Buying From Mr Key Shop

None of this is a claim that Mr Key Shop’s specific keys don’t meet these conditions — we have no evidence either way, and the same legal framework applies to every reseller named in the Comparison section. The practical takeaway is the same regardless of retailer: the law you’re relying on for a resold key’s legitimacy is real and genuinely protective, but it’s a legal principle about resale in general, not a guarantee stamped on any individual key you buy. Activating a key immediately and keeping your purchase confirmation are the practical steps that actually protect you if a specific key later turns out not to meet these conditions.