The secure boot mechanism planned for Microsoft's Windows 8 has already provoked considerable outcry from Linux users worried that the technology will make it impossible to install their favorite free and open source operating system on Windows 8 certified PCs.
Now, none other than the Free Software Foundation (FSF) has added its voice to the protests, warning that, “if done wrong, this system would have to be called Restricted Boot, because it could make computers incapable of running anything but Windows.”
Source
A Guy