James Bottomley describes the process of taking control of a UEFI secure boot system. "Even if you only ever plan to run Windows or stock distributions of Linux that already have secure boot support, I’d encourage everybody who has a new UEFI secure boot platform to take ownership of it. The way you do this is by installing your own Platform Key. Once you have done this, you can use key database maintenance tools like keytool to edit all the keys on the Platform and move the platform programmatically from Setup Mode to User Mode and back again. This blog post describes how you go about doing this."