If you do not submit a Notice of Dispute, then the Copyright Office regulations will deem that you do not dispute the claim of the applicable DSP, and you will, therefore, not receive payments from The MLC in connection with historical unmatched uses by that DSP for the works and the period identified by that DSP for you. This includes payments for previously unmatched uses that The MLC matches to such works, as well as any distributions of historical unmatched royalties based upon market share for such period.
