Universal Music Group, the largest music label, has implemented a new online streaming policy for its artists: each song for its artists will be limited to either 90-second clips or full-songs that contain promotional voice-over messages, reports Billboard. Excluded are any online services that UMG has a commercial licensing deal with, which means it is getting compensated for each stream. The policy applies to MySpace (which UMG is suing for violation of copyright law) and others. The story says UMG is concerned that users won’t buy the track or album if they get free streaming of full songs.