'Tibet' film faced clear dilemma.

Canadian filmmaker Kalsang Dolma's documentary about her ancestral Tibet, China has generated political intrigue and a media storm ahead of its world premiere in Toronto tonight. Having promised Tibetans appearing in her film that their identity would remain a secret, she is haunted by the prospect that she has exposed them to danger and possible arrest if their anonymity is broken. To ensure that no digital recording equipment is present tonight that might help identify Tibetans in the film, the National Film Board of Canada has hired security guards waving metal detector wands to check bags and purses at the entrance of the Bloor Cinema, and observers will be planted in the audience or will walk up and down the theater aisles with night vision thermal goggles to detect the heat signature of any recording devices.