> regulations are just as much part of the law as statues.
The ruling does apply to regulations, it doesn't apply to material referenced in regulations (either directly or indirectly), which a whole lot of copyrighted things are.
(For an example of indirect reference, the HIPAA transactions and code sets rule regulations adopt CMS’s Healthcare Common Procedure Coding System as a standard code set for certain purposes. Great, as it's a federal government product, and therefore free from copyright burdens.
Except that the “Level 1 codes” in the HCPCS are defined by reference as the AMA’s Current Procedure Terminology codes, and the definition of that code set is under copyright and not freely available.