You will see a persistent "Activate Windows" watermark in the bottom-right corner, and you cannot access personalization settings (like changing the wallpaper).
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A faint watermark on the bottom right of the desktop screen. You will see a persistent "Activate Windows" watermark
: For businesses, using unlicensed software can result in failed audits, contractual breaches with clients, and potential lawsuits. Safe and Legal Alternatives contractual breaches with clients
The safest way is to buy a digital license directly through the Windows 10 Settings menu.
If you purchased a laptop or desktop pre-installed with Windows, it often has a digital license linked to your motherboard.