Is there a specific or watermark you are trying to resolve?
Opinions in technical communities vary. Some experienced users consider RemoveWAT a "last resort" tool to be used only when conventional activation methods fail. Others strongly advise against it, noting that compromised or outdated system files can create security vulnerabilities that malicious software could later exploit.
It halts the services that monitor software licensing.
For users comfortable with periodic re-activation (every 180 days), KMS emulators are relatively safe and widely tested. They work well for both Windows and Microsoft Office products.