"Despite the best efforts of Fedora, openSUSE, Ubuntu, and the Linux Foundation, booting Linux on UEFI Secure Boot Windows 8 PCs continues to be a problem . The easiest way to avoid Windows 8 lock-in is to disable UEFI Secure Boot from your system before it starts to boot. However, this option may not be available on all motherboard; isn't available at all on Windows RT devices, such as the Surface; "
There are also more hoops the Linux vendors have to jump that are explained in the article:
http://www.zdnet.com/linux-foundation-uefi-secure-boot-key-f...
Also, what I didn't understand myself - is the $99 Fedora has to pay for the key just something they have to pay once? Or do they have to pay $99 for every single machine? Because that would be pretty ridiculous if Microsoft managed to make Linux as expensive as Windows licenses, through UEFI.