Harry Potter: GCHQ 'intervened over Half-Blood Prince leak'

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Bloomsbury's Nigel Newton said GCHQ contacted him in 2005 after it apparently discovered an early copy of The Half Blood-Prince on the internet. However, after a page was read to an editor, it was determined to be fake. A spokesperson for GCHQ told the Sunday Times: "We don't comment on our defence against the dark arts."
From Harry Potter: GCHQ 'intervened over Half-Blood Prince leak' - BBC News