Product Activation in Windows 7 and Windows Server 2008 R2 can be bypassed by a hack according to an article at The Register. This means that a user can get either of the operating systems with a product activation key.
It is a similar breach in Windows Vista.
“We’re aware of this workaround and are already working to address it,” said a Microsoft spokesperson to The Register.
The hack nullifies the sppcompai.dll which bypasses product activation and licensing in three different technologies.
Source: The Register