By default, Windows Media Player does not allow Web pages to access information in your digital media files and in your library. However, any software that you install on your computer, such as programs or plug-ins, has full access to your library.
Web pages may request permission to access your library. Web pages may access the information in your digital media files and library in order to offer you similar content, advertise sales, or recommend music or video services, such as subscriptions.
Before the Player shares information from your files and library, a message is displayed notifying you that the Web page is seeking read or full access to your files and library. If you grant the Web page read access, it has the ability to scan the contents of your files and library. If you grant the Web page full access, it has the ability to scan and change media information in your files and library. This can include adding, removing, and changing media information, such as a track name, in your library and in your digital media files.
If you grant a Web page read or full access to your library when prompted, you only grant access for that single instance. In other words, when you open the Web page again, you will be prompted to grant access again.
The Player may also prompt you when skins and programs try to access your library, but usually it is because the skin or program is changing to a lower access level. For example, the Player may prompt you when a skin switches from full to read access.