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Well-placed sources who leak information -- from emails to audio and video tape -- have long been key to watchdog journalism. But a host of issues come with working with such sources: How do you confirm that the tape or the document is real? How can you cultivate sources and protect those who work with you at great personal risk? Learn about the steps you should take from panelists who have dealt with high profile cases, from corporate and government whisteblowers to the source of the Mitt Romney "47 percent" speech tape.