so instead of how things are now, where people can report to the site about something copyrighted being infringed upon, and the site would then review it and remove it, this legislation would attack the sites whatever it is is posted on.
It's very bad, very unconstitutional, and would give the government too much power over what is said, posted, displayed, etc, on the internet.
It is an American piece of legislation, meant to fight piracy. However, it was written too broadly. Basically it would allow copyright holders to get court orders against the websites. The web sites would then be block, censored from search engines, and would prevent 3rd party companies from doing business with the site.
Basically, it is unconstitutional, and would restrict freedom to post, read, watch, ect, anything on the internet
It would effect everyone who uses the net, not just the US.