No - http://blogs.msdn.com/b/b8/archive/2011/09/22/protecting-the-pre-os-environment-with-uefi.aspx http://blogs.msdn.com/b/b8/archive/2011/09/22/protecting-the

No - http://blogs.msdn.com/b/b8/archive/2011/09/22/protecting-the-pre-os-environment-with-uefi.aspx http://blogs.msdn.com/b/b8/archive/2011/09/22/protecting-the... "Microsoft does not mandate or control the settings on PC firmware that control or enable secured boot from any operating system other than Windows. [...] A demonstration of this control is found in the Samsung tablet with Windows 8 Developer Preview that was offered to //BUILD/ participants. In the screenshot below you will notice that we designed the firmware to allow the customer to disable secure boot. However, doing so comes at your own risk. OEMs are free to choose how to enable this support and can further customize the parameters as described above in an effort to deliver unique value propositions to their customers. Windows merely did work to provide great OS support for a scenario we believe many will find valuable across consumers and enterprise customers."