A Spanish open software group has filed complaint with the EU accusing Microsoft of unfairly locking out other operating systems. From V3:

Hispalinux is said to be targeting Redmond's use of the UEFI Secure Boot component unfairly prevents users from installing third=party software.

Designed as a security component, the UEFI specification creates a platform which verifies critical system components before booting up a system, hopefully preventing malware infections from altering vital components.

 Open software group cries foul to EU over Windows 8