Yahoo! has ramped up its campaign for major labels to allow online music stores to sell music without copy protection.

Yahoo! product manager, Ian Rogers, wrote on the Yahoo! Music blog: "We've been publicly trying to convince record labels that they should be selling MP3s for a while now."

The company's arguments - as first reported by iLounge - are relatively simple. "DRM (digital rights management) doesn't add any value for the artist, label (who are selling DRM-free music every day - the CD), or consumer, the only people it adds value to are the technology companies who are interested in locking consumers to a particular technology platform."

Rogers then explains that DRM - which must be constantly policed and updated to guard against being compromised - is costly to create and maintain.

When it comes to resources, he explains: "We'd much rather have our engineers building better personalisation, recommendations, playlisting applications, or community applications, instead of complex provisioning systems which at the end of the day allow you to burn a CD and take the DRM back off, anyway."

He also points out the limits of the exiting system: consumers cannot freely copy CDs they own due to copying restrictions, they can't play content on different devices, and DJ software cannot access and play protected content.

"Un-DRM'd content is implicitly more valuable to a consumer," he writes.