An agreement that some campaigners have called the "biggest global threat to the internet" has just been signed, potentially bringing huge new restrictions on what people can do with their computers. The Trans-Pacific Partnership is the conclusion of five years of negotiations, and will cover 40% of the world's economy. Its claimed purpose is to create a unified economic bloc so that companies and businesses can trade more easily — but it also puts many of the central principles of the internet in doubt, according to campaigners. One particularly controversial part of the provisions make it a crime to reveal...