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KMS38/KMS19 works for LTSC/LTSB or Server Standard/Datacenter 20 and can also work in an offline mode.HWID needs an active internet connection (without VPN) which might cause additional security problems (since MS gets your real data such as IP etc).You can't uninstall or remove HWID once you activate it - you can only remove the executable but the activation files are still on the partition.
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Your hardware ID is stored on Microsoft servers, which means they can blacklist or close the loophole (if they want).
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