As the practice becomes more legitimate, there are calls in the US for "control filters"...

As the downloading of music continues to become a legitimate enterprise, fans could face further limits on the practice.

This week the RIAA, the body representing the interests of record companies in the United States, have called for censorship of tracks available to download on sites like Napster 2.0 and iTunes.

According to Billboard, the RIAA is asking such service providers to ensure “effective parental control filters to provide parents more information and control over what their children can download”.

The measures would be similar to the ‘Parental Advisory’ stickers found on CDs.

RIAA chairman and CEO Mitch Bainwoi announced the plans on Wednesday (October 29) during a Federal Trade Commission Workshop on media violence and children in Washington DC.

He said: “(The guidelines) will reinforce the importance of consistent descriptors across all services…. (and will) help parents draw a distinction between the private peer-to-peer networks and legitimate online music services.”

Music downloading is currently entering its second phase, as a legitimate, paid-for way of accessing music. Napster, the original peer-to-peer service, this week relaunched as a paid-for provider with Napster 2.0.