The ruling from Los Angeles Superior Court Judge Mel Red Recana gives the force of law to the $US30.9 million ($A44.3 million) award in favour of MRC and other companies that produced the show by a private arbitrator who heard the case against Spacey.

Recana wrote that Spacey and his lawyers "fail to demonstrate that this is even a close case" and "do not demonstrate that the damages award was so utterly irrational that it amounts to an arbitrary remaking of the parties' contracts".

"We are pleased with the court's ruling," MRC lawyer Michael Kump said in an email to The Associated Press.

Spacey has denied the allegations through his lawyers and his spokesman, who did not immediately respond to emails seeking comment.

The arbitrator found Spacey violated his contract's demands for professional behaviour by "engaging certain conduct in connection with several crew members in each of the five seasons that he starred in and executive produced House Of Cards," according to a filing from Kump requesting the approval.

As a result, MRC had to fire Spacey, halt production of the show's sixth season, rewrite it to remove Spacey's central character, and shorten it from 13 to eight episodes to meet deadlines, resulting in tens of millions of dollars in losses, according to court documents.

Spacey's lawyers argued in their own filings that the decision to exclude him from the show's sixth season came before the internal investigation that led the crew members to come forward, and thus was not part of a contract breach. They argued that the actor's actions were not a substantial factor in the show's losses.

The ruling from the private arbitrator came after a legal fight of more than three years and an eight-day evidentiary hearing that was kept secret from the public, along with the rest of the dispute, until a panel of three more private arbitrators rejected Spacey's appeal and upheld the decision in November.

The 63-year-old Oscar winner's career came to an abrupt halt late in 2017 as the #MeToo movement gained momentum and allegations against him emerged from several places.

Spacey was fired or removed from projects, most notably House Of Cards, the political thriller where for five seasons he played lead character Frank Underwood, a power-hungry congressman who becomes president.

Last month, Spacey pleaded not guilty in London to charges of sexually assaulting three men a decade or more ago, when he was director of the Old Vic theatre there. His lawyer said he "strenuously denies" the allegations. He is set to face trial next year.

Another criminal case brought against him, an indecent assault and battery charge stemming from the alleged groping of an 18-year-old man at a Nantucket resort, was dismissed by Massachusetts prosecutors in 2019.

Spacey also faces lawsuits from other men, including actor Anthony Rapp.

Australian Associated Press