Warner Music has rejected a suggestion from Apple boss Steve Jobs that record companies should remove copy protection software from digital music downloads.
Apple's iTunes dominates the digital download market
Its boss Edgar Bronfman, said Mr Jobs' proposal was "without logic and merit".
At present, most download sites, including Apple's iTunes store, use such software to limit the number of machines on which songs can be played.
Mr Jobs said this week that Digital Rights Management systems had not ended piracy and so should be removed.
In an open letter, the Apple boss added that removing such software would also allow greater usability for customers, as any online music store would be able to sell songs that would work on all players.
"This is clearly the best alternative for consumers, and Apple would embrace it in a heartbeat." said Mr Jobs.
Yet Warner Music, the world's fourth largest record company, is far from convinced.
It is home to artists including Madonna and Green Day.