The legality of buying these keys is a complex tug-of-war between corporate policy and consumer rights. In many jurisdictions, such as the European Union, the "Principle of Exhaustion" (First Sale Doctrine) suggests that once a software creator sells a copy of their work, they cannot prevent the subsequent resale of that specific copy.
: Since the product is just a string of 25 characters, it is incredibly easy for a seller to provide a fake or already-used code. While eBay's Money Back Guarantee provides some protection, the low price point often makes the hassle of a refund feel not worth the effort. buying windows on ebay
However, Microsoft does not view these eBay transactions as "authorized." From their perspective, a key purchased on eBay is often "non-genuine," even if it successfully activates the software. This creates a distinction between and legal licensing . A key might work today, but it doesn't necessarily mean you have the legal right to use it in a professional or audited environment. The Risks: Security and Longevity The legality of buying these keys is a
The primary reason eBay is flooded with Windows keys—often priced between $2 and $20—is the existence of and Volume Licensing agreements. While eBay's Money Back Guarantee provides some protection,