1. Introduction
The network neutrality debate started when Madison River Communications, a small telecommunications company in North Carolina, blocked their DSL end-users from using the voice over Internet protocol (VoIP) service of Vonage in 2004 (Herman, 2006). Even in South Korea, which developed an extensive broadband network since 2000, subscribers of LG PowerCom were not allowed to use Hana TV service, a kind of pre-Internet protocol TV (IPTV) service, because LG PowerCom discarded Hana TV’s service packets (Wallsten and Hausladen, 2009). Not only in the United States and South Korea,1 but also all around the world, network neutrality is a sensitive issue since the development of VoIP and IPTV services.