After months of waiting for the biopic Winnie to be released, computer hackers have stolen footage of the film and put together an unauthorised trailer which has been making the rounds on the internet.

A trailer of the film, based on Anna Marie du Preez Bezdrob's biography Winnie Mandela: A Life, made it onto the internet on Monday, billed as the "official" version.

The film-makers are "not happy". A movie insider said the trailer "was not formally released and that an unauthorised download originated from a secure website belonging to our sales representative, Filmbridge .

"The material was not formally edited, graded or sound-mixed. At this stage, the producers have elected to make no further comment and are investigating the matter," the insider said.

The film follows the life of Winnie Mandela, played by Oscar-winner and singer Jennifer Hudson, after former president Nelson Mandela, played by Terrence Howard, was imprisoned.

Directed by Darrell J Roodt, the movie was shot in South Africa over three months.

It made the news earlier this year when Madikizela-Mandela threatened Roodt with a lawsuit if he did not consult her about the storyline of the film.

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