Windows Media DRM Individualization

To increase security, the DRM component of applications (Windows Media Player, for example) can be individualized. An individualized application is one that has received an upgrade to its DRM components that differentiates it from all other copies of the same application on other user's computers. Content owners can require that their protected files be played only on an application that has been individualized.
The individualization process starts when the application contacts the Microsoft Individualization Service, which then installs a security upgrade on the user's computer. The content owners can chose to issue licenses only to individualized players.

The security component can be upgraded on any machine at any time by clicking the following link: http://drmlicense.one.microsoft.com/Indivsite/en/indivit.asp. Keep in mind that this link is controlled by Microsoft. It will redirect you to a their site and is bound by their Privacy Policy.