Apple seems set to face more pressure to license its iTunes copy-protection technology, FairPlay.

Denmark is poised to pass legislation in 2007 that will force operators in the digital music market to open up their digital rights management (DRM) systems so that users can buy media from any service and play that media on any device.

This follows last week's decision in France that required Apple and others in the industry to open up their DRM. Apple has condemned this decision as "state-sponsored piracy".

Industry watchers say that making rights management systems interoperable will help the industry to grow.

This morning a report on Ars Technica claims the Danish Minister of Culture, Brian Mikkelsen, plans to introduce similar legislation to that passed in France in 2007.

Mikkelsen has been under pressure from local firms Maersk and TDC, both of whom operate online music services.