Chris Williams has a story in The Register about some problems that Microsoft is having with UEFI Secure Boot:
Bungling Microsoft singlehandedly proves that golden backdoor keys are a terrible idea
Redmond races to revoke Secure Boot policy
Updated Microsoft leaked the golden keys that unlock Windows-powered tablets, phones and other devices sealed by Secure Boot – and is now scrambling to undo the blunder.
These skeleton keys can be used to install non-Redmond operating systems on locked-down computers. In other words, on devices that do not allow you to disable Secure Boot even if you have administrator rights – such as ARM-based Windows RT tablets – it is now possible to sidestep this block and run, say, GNU/Linux or Android. […]