The DTCPIPPort attribute is the Transmission Control Protocol (TCP) port number of the computer or device that must be contacted for the Digital Transmission Content Protection over Internet Protocol (DTCP-IP) Authenticated Key Exchange (AKE) for the media item.
If this attribute is available, the media item is protected using DTCP-IP.
This attribute is not available for media items in the current user's local library. It is available only for media items that belong to a remote library; that is, a library that has been made available by another user on the home network. To determine whether a media library is remote, call IWMPLibrary::get_type.
Windows Media Player 12