All the big record companies have been experimenting with DRM-free tracks, but research about future revenue implications and consumer behaviour have been inconclusive, says one music company executive.

• 所有大唱片公司开始试验出售没有产权保护技术的唱片，观测对未来收入的影响以及消费者行为的变化，但相关研究还没有定论，一唱片公司管理人士说。