Code of Federal Regulations Title 37. Patents, Trademarks, and Copyrights § 37.210.8 Documentation

All compulsory licensees shall, for a period of at least five years from the date of service of an Annual Statement of Account or Amended Annual Statement of Account, keep and retain in their possession all records and documents necessary and appropriate to support fully the information set forth in such Annual Statement or Amended Annual Statement and in Monthly Statements served during the fiscal year covered by such Annual Statement or Amended Annual Statement.