In the case of prostreams, they are resellers of the service, so to differentiate they branched from iVue (which was branched from TV Guide and probably On Tap), so technically their guide is 'private' vs. paid. The reason for going private is basically due to server load. iVue is also getting slammed. I think those issues will end when IPTV Stalker stops working, and the blatant leeching goes away.