The Australian Federal Police has closed its investigation of the leaking of a damaging video of former prime minister Kevin Rudd swearing and banging a desk.
The release of the video, posted anonymously on YouTube, escalated the tensions between Mr Rudd and Prime Minister Julia Gillard which contributed to February's leadership ballot.
An AFP spokeswoman said it had not found ''sufficient material or evidence to substantiate charging of any person for theft or unauthorised disclosure'' of the video.
''The AFP has finalised the matter and as such, it is not appropriate to comment further,'' the spokeswoman said in a statement.
A spokesman for Mr Rudd said he had no comment.
The video shows Mr Rudd fluffing his lines while trying to record a video message for Chinese New Year in 2009.
In a series of out-takes he expresses frustration at the diplomats from the Australian embassy in Beijing, who had scripted the message in Mandarin.
''Tell these d---heads in the embassy to just give me simple sentences,'' Mr Rudd says in the video. ''This f---ing language... it just complicates it so much.''
At another point, he appears to ask a staffer to cancel a scheduled meeting.
''Tell them to cancel this meeting at 6 o'clock will you... I don't have the f---ing patience to do it.''
The video appeared on YouTube on February 18, under the title ''Kevin Rudd is a Happy Little Vegemite''.
Four days later, Mr Rudd resigned as foreign minister and announced his intention to challenge Ms Gillard for the leadership. The following Monday he was trounced in a caucus ballot, 71 votes to 31.
At the time Mr Rudd commented that the release of the video was ''a little bit on the unusual side''.
An internal review by the Prime Minister's department found the video had not come from within the department. At the time, Ms Gillard denied her office was involved in the release of the video, saying it did not have access to the material.