Its a strange attempt at preventing users from removing Windows 8 from a device and installing something else.
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No It's not, that's a lot if duff information being put out by various parties (mainly Linux crowds).
Windows 8 does not need it. However if it is installed and activated (there is no requirement to have it on home pc's), only digitally signed software will install. As Linux by default is not certified, it will not install*. MS on insist that it is installed and activated on PC's that carry the Win8 logo . There is no mandate saying it can't be turned off.
The idea is to stop rootkits etc screwing up your boot loader etc.
* Linux can be certified and MS have worked with the Linux Foundation for sometime for this.
Robert Wilensky:
We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true.