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.
http://www.bbc.co.uk/news/technology-19842851