A rubbish question, but if you build your house in accordance to the published codes but don't purchase a copy, are you infringing their copyright by adhering to the standards?
"Copyright protection may, however, extend to substantial literary expression—a description, explanation, or illustration, for example—that accompanies a recipe or formula or to a combination of recipes, as in a cookbook."
Note that 'substantial' here doesn't mean it needs to be novella length. A simple description of the steps involved would be enough.
“[The] recipes’ directions for preparing the assorted dishes fall squarely within the class of subject matter specifically excluded from copyright protection by 17 U.S.C. § 102(b).”
IANAL etc. Just curious if you have heard otherwise?
[0] - http://www.pddoc.com/copyright/publications_v_meredith.htm