POLICE have confirmed they are investigating the leak last year of a damaging video of former Prime Minister Kevin Rudd swearing.

The Australian Federal Police said the matter had been referred to them and they are "evaluating the information," according to the Sydney Morning Herald.

The footage of Mr Rudd showed out-takes from a video made in his office in which he showed his frustration at the wording of a speech by swearing and banging the desk.

The clip was released anonymously on YouTube around the time of the February leadership spill.

According to the SMH, Prime Minister Julia Gillard asked the secretary of the Department of Prime Minister Ian Watt to do security checks on the leak.

Ms Gillard denied her office was responsible for the leak and a spokesman said the Prime Minister's department had not referred the matter to police.