This undated photo provided by HBO Documentary Films shows a scene from "Welcome to Chechnya." In documentary film, the anonymous source has often been reduced to a shadowy, voice-distorted figure, or worse, a pixelated blur. But the new documentary premiering Sunday, Jan. 26, 2020, at the Sundance Film Festival has with the aid of advanced digital technology gone to greater lengths to preserve the secrecy of its sources while still conveying their humanity. (HBO Documentary Films via AP)
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