I see this reported in the Guardian UK. As Cannes waits with bated breath for the opening of Michael Moore's movie today, Harvey Weinstein, whose Weinstein Company is behind the film, says that the US Government is trying to impound the negative of the film.
According to Weinstein:
the US Treasury's moves meant "we had to fly the movie to another country"- he would not say to where. "Let the secret service find that out - though this is the same country that thought there were weapons of mass destruction, so they'll never find it." He added that he feared that if the film were impounded, there might be attempts to cut some footage, in particular the last 20 minutes, which related to a trip to Cuba. This, said Weinstein, "would not be good."
Weinstein again comments on how much all this publicity is saving them on advertising.
AP Report in International Herald Tribune
On the advice of lawyers, the filmmakers spirited a master copy of "Sicko" outside the United States in case the government tries to seize it. As for whether the inquiry could prevent the film opening in the U.S. as planned on June 29, Moore said: "We haven't even discussed that possibility."
I'm not clear from all of the above if there was really a credible threat or was this a pre-emptive strike?