The Open Music Model is an economic and technological framework for the recording industry proposed in 2003, which suggests that the only viable system for distributing music online is through a DRM-free peer-to-peer file sharing system. It is based on earlier research conducted at the Massachusetts Institute of Technology. The model proposed five necessary and sufficient fundamental requirements for a viable commercial peer-to-peer music distribution network: Criticisms of the model include that it does not address the issue of piracy.