Search notes:

Registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Features

Values found in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Features include

`DlpAppEnlightenmentSettings`
`MpCapability`
`MpPlatformKillbitsFromEngine`
`TamperProtection`	As per superuser answer, setting `TamperProtection` to 0 turns tamper protection off, setting it to 5 turns it on. After an initial installation of Windows, I found this value to be 1. It seems that administrator privileges are not sufficient to change this value.
`TamperProtectionSource`
`TPExclusions`

See also