Music label EMI is now known to have sued fledgling service ReDigi for its strategy of reselling downloadable songs. New details obtained by CNET showed that EMI unusually didn't object to the doctrine of first sale, which only lets a seller collect income with the initial purchase, but rather the origins of the MP3s and other music. ReDigi isn't selling the music from paid sources like iTunes, EMI said, and by extension isn't selling legal copies.