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The US Supreme Court has ruled that file-sharing companies are to blame for what users do with their software.
The surprise ruling could start a legal assault on the creators of file-sharing networks such as Grokster and Morpheus.
The case was brought by 28 movie and music makers who claimed that rampant piracy was denting profits.
The Supreme Court judges were expected to rule in favour of the file-sharers because of legal precedents set when video recorders first appeared.