[link|http://www.itworld.com/AppDev/1471/IDG020221mediaplayer/|Just thought you'd like to know]
Excerpt:
Windows Media Player 8, which comes with Microsoft's Windows XP, contacts a Microsoft Web server each time a new DVD is played on a computer. The server is given a unique fingerprint for the DVD and the media player client, allowing Microsoft to track what movies are watched on a particular PC, Smith wrote in his advisory posted at [link|http://www.computerbytesman.com/privacy/wmp8dvd.htm|http://www.computerb...ivacy/wmp8dvd.htm].
The unique code Windows Media Player 8 sends to Microsoft identifies the software, not the person using it. However, the anonymity could be lifted if the user signs up for the Windows Media e-mail newsletter, according to Smith.
Title and track information on the DVD are retrieved from Microsoft's server and stored in a file on the user's computer, Smith wrote in his advisory. This local file could pose a privacy problem if the PC is used by more than one person. A user could uncover what movies another user is watching.