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The pair of anti-piracy bills would have allowed the Justice Department and copyright holders to seek court orders against foreign websites that steal from American content creators. It would bar advertising networks and payment facilitators such as credit card companies from doing business with the offending websites.

The bills have the strong support of the entertainment industry, which claims to lose billions of dollars every year to foreign copyright violators, and from industries such as pharmaceuticals battling fake and sometimes harmful alternatives sold on the Internet.