If that happens, forget about booting anything other than Microsoft-approved operating systems on these locked-down PCs. And while it remains to be seen whether hardware manufacturers lock down their hardware, history shows that manufacturers are generally at the beck and call of Redmond when shipping out their products. So with the exception of Canonical and Red Hat – both Ubuntu and Fedora have signed keys from Microsoft for their boot loaders – the rest of you who aren’t Ubunteros or Fedoristas could very well be out in the cold.