Product activation was introduced to Norton Internet Security 2004, addressing the estimated 3.6 million counterfeit Norton products sold. A alphanumeric code is generated to identify a computer's configuration, which ties in with the product key. Users are allowed to activate their product five times with the same product key. Spyware detection and removal was introduced to the 2005 version for Windows, with the tagline "Antispyware Edition". The tagline was dropped in later releases. 