Apple Inc has agreed to start selling digital songs from its iTunes store without copy protection software.
At present, most music downloaded from Apple's iTunes store can only be played through an iTunes interface or iPod.
The agreement with Sony BMG, Universal, and Warner Music will end digital rights management (DRM) software currently attached to iTunes music.
The changes were announced at the end of the keynote address, at the Macworld conference in San Francisco.
Apple's senior vice president of worldwide product marketing, Phil Schiller delivered the speech, traditionally given by Steve Jobs.
"Over the last six years songs have been $0.99 [79p]. Music companies want more flexibility. Starting today, 8 million songs will be DRM free and by the end of this quarter, all 10 million songs will be DRM free," he told the crowd.
Rory Cellan-Jones reports from Macworld 2008 in California
Apple has also revised its pricing structure, offering a two-tier system with songs available for $0.69 and $1.29. Prices will vary slightly in the UK.
At present, the firm has a one-price-fits-all strategy - currently 79p per track - with no subscription fee.
The new model will have a varied pricing structure, with what the company calls "better quality iTunes Plus" costing more.
By the end of this quarter, all 10 million songs will be DRM free
Phil Schiller, Apple
It remains to be seen whether music already purchased from iTunes would have its DRM stripped off.
The move could potentially spell the end for DRM limited music, which was never popular with users or the record industry.
Mark Mulligan, a director with market analysts Jupiter Research, said the end of DRM - in its current form - was inevitable.
"The only reason it has taken so long is that the record industry has been trying to level the playing field, by giving away DRM free to everyone else, but even that hasn't dented Apple's share," said Mr Mulligan.
"Ultimately, what we're going to end up with is a new form of DRM. The more you pay, the less DRM you get bolted onto your music. Premium music will be DRM free, the cheaper it gets, the more shackles are attached," he added.
In 2007 Apple's CEO, Steve Jobs, published an open letter called 'Thoughts on Music' in which he called on the three big record companies to ditch DRM.
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