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The idea that the Russians might try to steal emails in order to discredit a candidate in an American election would have seemed preposterous a decade ago. Now it's what intelligence services think actually happened. It's a development with all sorts of implications, not least the questions it raises for journalists about how they treat stolen information. Newsnight's editor, Ian Katz, who was involved in covering some of the biggest leaks of recent years, dusted off his reporter's notebook.