License keys explained: how they actually work (a beginner's guide)

<p><strong>Selling a plugin, a bot, a script or a desktop app, and not sure how license keys actually work?</strong> You're not alone. Most guides jump straight to code, and skip the part where you decide what a key should do.</p> <p>This guide explains the whole system in plain words: what a key is, how it gets tied to a computer, how your app checks it (online and offline), how trials and expiry

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