A bill introduced Thursday in Congress would require file-swapping companies to get parental permission before allowing minors to use their services.

The bill, called the Protecting Children from Peer-to-Peer Pornography (P4) Act and sponsored by Reps. Joe Pitts, R-Pa., and Chris John, D-La., would require the Federal Trade Commission to regulate peer-to-peer networks and take steps to ensure that children aren't accidentally coming across porn.

The bill's sponsors said as many as 40 percent of all files traded on the networks are porn.

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