Ordinarily, the operating system requires users to activate their copy of Windows 7 within 30 days. However, a recently outlined method allows the normal notifications to be turned off.
The software doesn't actually get confirmed as legitimate, but users are able to keep using the product indefinitely.
Microsoft confirmed on Friday it is aware of the technique, but said that it is working to shore up the activation procedure.
For more, read "Hackers bypass Windows 7 activation " on CNET News.