Microsoft told bloggers that copy protection is too complex.

Mr Gates was talking to bloggers and web developers at Microsoft's Seattle headquarters. Digital Rights Management (DRM) is used to stop copying. It is, however, an issue for people, even those who purchase media legally, for they feel it limits them. "DRM is not where it should be," said Mr Gates.

"In the end of the day incentive systems (for artists) make a difference," said Mr Gates.

"But we don't have the right thing here in terms of simplicity or interoperability," he added.