RedHat:

Microsoft will provide keys for Windows and Red Hat will provide keys for Red Hat Enterprise Linux and Fedora. Similarly other distributions can participate at a nominal cost of $99 USD – allowing them to register their own keys for distribution to system firmware vendors.

A healthy dynamic of the Linux open source development model is the ability to roll-your-own. For example, users take Fedora and rebuild custom variants to meet personal interest or experiment in new innovations. Such creative individuals can also participate by simply enrolling in the $99 one time fee to license UEFI. For users performing local customization, they will have the ability to self-register their own trusted keys on their own systems at no cost.