In the approach Fedora chose, the organization would pay US$99 to have Microsoft sign the binary release of the Fedora distribution. Although the cost for the certificates would be less than $200 a year for Fedora's twice-a-year release schedule, it still hands control of Fedora over to Microsoft, however nominally. With the key, the machine can check if the binary version of the distribution is identical to the one submitted to the key signer. Fedora engineers would then develop a bootloader -- a small program that loads the operating system when the computer is powered on -- that would provide the required Microsoft key to the hardware and then hand over operations to the standard bootloader.
http://www.pcworld.com/businesscenter/article/256607/fedora_linux_capitulates_to_microsoft_boot_certificate.html


