An international tribunal has unveiled a secret ruling confirming it rejected a bid by tobacco giant Philip Morris to sue Australia over its plain packaging laws, calling the attempt "an abuse of rights".

Key points: Philip Morris manufactures major tobacco brands including Marlboro

Philip Morris manufactures major tobacco brands including Marlboro Tribunal says Philip Morris had ample warning of laws

Tribunal says Philip Morris had ample warning of laws Tribunal says the company's legal claims are 'inadmissible'

In its heavily redacted 186-page ruling dating from December 17, 2015, the Permanent Court of Arbitration (PCA) said it had no jurisdiction over the case brought by Philip Morris.

In 2012, Australia became the first country to mandate that cigarettes must be sold in plain packages, in a bid to reduce smoking rates.

The initiative has since been followed by other nations including France and Britain.

But big tobacco firms including Philip Morris have launched legal challenges against such laws, arguing the new rules impinge on their trademark intellectual property.

Philip Morris, the manufacturer of some of the world's most recognisable brands, including Marlboro, lodged the challenge with the arbitration court based in The Hague in 2011 after the plain-packaging legislation was first passed, using a 1993 trade deal between Australia and Hong Kong that included foreign investment protections.

But the PCA found in its unanimous ruling that "the main and determinative, if not sole, reason" for a restructuring of the company as far back as 2005 was to enable it "to bring a claim under the treaty, using an entity from Hong Kong" after it received ample warnings that such legislation was being considered.

"The record indeed shows that the principal, if not sole, purpose of the restructuring was to gain protection under the treaty in respect of the very measures that form the subject matter of the present arbitration," the court ruled.

"The tribunal cannot but conclude that the initiation of this arbitration constitutes an abuse of rights," the court added.

The court therefore found that Philip Morris's claims were "inadmissible" and it was "precluded from exercising jurisdiction over this dispute".

The ruling came after a closed-door hearing held in Singapore in February 2015.

Canberra had welcomed the decision, saying "plain packaging is a legitimate public health measure".

AFP