Norway's Consumer Ombudsman has slammed Apple's iTunes service, saying the terms and conditions of the store violate Norwegian law.

The government consumer rights watchdog is annoyed that songs sold through iTunes are rights-protected by Apple in such a way as they cannot be transferred into other digital music formats, and cannot be played on other devices.

Consumer Ombudsman Bjørn Erik Thon told local channel TV 2 that Apple would either have to, "change its business practices in Norway or pay fines". He also said that Apple's "well-paid lawyers" have begun to call him frequently regarding the matter.

A local report claims other consumer groups are considering similar action.

The news comes as UK label trade group the BPI today urged Apple to make its services interoperable, and as French lawmakers also begin to push for interoperability between music services.