In Windows 8 activation system is vulnerable, which replaces a false activation key for validity.
The system authentication Windows 8 discovered a vulnerability that allows for free to get activated version of the operating system. By false activation through KMS (key management system) and update via Windows Media Center, any user can get a “legitimate” version of the new operating system from Microsoft.
This method requires to install Windows 8 using any key (including those already used), connect to the server with KMS, configured so as to accept the key as valid. After installation, the user receives a 180-day illegitimate operating system version.
In order to make the operating system a legitimate need to use the free upgrade to Windows 8 Pro, which sets the Windows Media Center. Service Windows Media Center replaces an activation key system, eliminating the opportunity to test its validity on servers Microsoft.
Recall that the free installation of Windows Media Center is a temporary offer Microsoft, which is only valid until January 31, 2013.