Ya it could be world wide,, US was already flexing its muscle over TVshack.com Judge in the UK said he should be extradited for Sharing protected Intellectual property... he was only the redirection site,, not the streamer...
Sopa would give the power to the US Attorney General to decide what sites can and should be blacked out all over the world... he would just have to contact the service/server provider and have you shut down for abusing intellectual property... Scary stuff
http://na.leagueoflegends.com/news/help-us-stop-sopa < for some infor from a gamers POV.