Just read this in the Windows Developer Preview - Windows 8 Guide:
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Secured boot
Secured boot stops malware in its tracks and makes Windows 8 significantly more resistant to low-level
attacks. Even when a virus has made it onto your PC, Windows will authenticate boot components to prevent
any attempt to start malware before the operating system is up and running. If the component isn’t correctly
signed by Microsoft, Windows will begin remediation and start the Windows Recovery Environment, which
will automatically try to fix your operating system.------------------------------------------------------------------------------------------------------------
Great news for security. Still not testet and with to little information, but it might look like there will be disk encryption available for all users, even though it still state that Bitlocker are a business customer feature. Maybe Bitlocker light?
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