The file contained a detailed series of interviews conducted shortly after the Russian Revolution with many of the protagonists in Rasputin's circle, but the resulting book is not a definitive biography of the man.

ECONOMIST: Ra-Ra-Rasputin

The rest of the content inside the file is essentially a self contained record store, with additional media you can unlock by submitting your email address.

ENGADGET

But on Tuesday, former director of public prosecutions Lord Macdonald, who reviewed for NI's owner News Corporation the e-mails in a file relating to bribes allegedly paid to police, said they contained "evidence of serious criminal offences".

BBC: Phone hacking: Scotland Yard boosts probe team

When Eric Johnson of the Tuck School of Business at Dartmouth College and his fellow researchers went through popular file-sharing services last year, they found files that contained health-related information as well as names, addresses and dates of birth.

ECONOMIST: Companies and information