The music label argues in a copyright complaint that ReDigi's service requires ReDigi to make unauthorized copies of songs.
The Recording Industry Association of America has sent Redigi, a service that sells used downloads, a cease and desist letter.
A judge sides with Capitol Records in the lawsuit between the record company and ReDigi -- ruling that MP3s can only be resold if granted permission by copyright owners.
Judge turns down EMI's request for a preliminary injunction against music reseller ReDigi, and says he's inclined to let the case go to trial because of the "fascinating" technological and legal questions it involves.
A newly awarded Amazon patent could open the door to an electronic marketplace where consumers can sell digital goods to each other.
The European Court of Justice reportedly says today that the rule applies to copies of software both on physical media and downloaded from the Internet.