GCHQ, the UK's surveillance agency, intervened to help prevent the sixth Harry Potter instalment leaking online [bbc.com], the book's publisher has said.
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 [thesundaytimes.co.uk]: "We don't comment on our defence against the dark arts."
GCHQ, based in Cheltenham, Gloucestershire, is a secret intelligence agency which monitors electronic communication to prevent terrorism and tackle serious and organised crime.
Your tax dollars (or pounds) hard at work.