Universal, the world's biggest music label, may try to force Apple to pay it a royalty on iPod sales, a report claims.

The news follows recent revelations that Microsoft has agreed to pay Universal a dollar for each Zune it sells.

Universal CEO, Doug Morris is arguing that a royalty is relevant, based on the logic that some music held on some iPods is stolen.

He's expected to propose such an arrangement when Apple and Universal sit down together to work out an extension to their existing distribution deal for music online.

The news emerges at around the same time that, last year, music labels began muttering about wanting to raise online music prices.

"It would be a nice idea. We have a negotiation coming up not too far. I don't see why we wouldn't do that, but maybe not in the same way," he told the Reuters Media Summit.