U.S. copyright regulations are found in title 37 of the Code of Federal Regulations (C.F.R.). The library has a physical set of official C.F.R. (See the call number listed below to find these in the stacks.) Electronic versions are available through the Government Printing Office (FDSys), Lexis and West. HeinOnline offers full historic coverage of the C.F.R., which can be useful when faced with an issue based on previous copyright regulations.