On a per program basis, StreamWatch will log usage data by viewer name (or IP address), tune-in time, tune-off time, and basic QoS data for the program per viewer. Many enterprises use this info for "nielsen"-like data to measure viewership or to bill for bandwidth consumption or per program viewership.
StreamWatch is for realtime broadcast stream(s)....it also adds overhead from each viewer (who is also a transmitter using multicast back to the Streamwatch device)
There is a ' journaling ' function on the IPTV Content Server for each ' video-on-demand ' . The data is stored in a runtime version of Mircossoft Access in a database called c:\JavaWebServer\iptvcm\database\odjournal.mdb.
so to get 'all' the Neilsen reports...both have to be used...