A US court is to consider a case that could determine whether digital media files can be resold.
One-year-old start-up ReDigi is battling music giant EMI over whether digital music can be retraded after it has been legally purchased.
ReDigi says that its software is designed to comply with existing United States copyright laws.
But EMI argues a legal principle which allows consumers to resell purchased material goods does not apply.
A judge at the district court in Manhattan, New York, will hear opening arguments in the case on Friday after EMI sued ReDigi for copyright infringement earlier this year.
Launched in October 2011, ReDigi bills itself as the first legal online marketplace for second-hand digital material.
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