Ford reprises his signature role in the fourth Indiana Jones film

Roderick Davis, 37, pleaded guilty in Los Angeles to receiving stolen property and commercial burglary.

As part of his plea deal, he will serve two years and four months in prison.

Davis - who has previous convictions for theft - was arrested on 4 October during a sting operation by detectives who posed as potential buyers.

The items stolen from the Universal Studios lot were said to contain confidential materials relating to the fourth instalment in Steven Spielberg's popular adventure series.

Film plot

Indiana Jones and the Kingdom of the Crystal Skull, which sees Harrison Ford reprise his role as the daredevil archaeologist, will be released next May.

Cate Blanchett, Shia LaBeouf and Ray Winstone co-star in the film, which finished shooting on 11 October.

Earlier this year its producers took action against an actor who was accused of revealing the film's plot in a newspaper interview.