I don't think it would be considered any sort of derivative work. Consider recipes (and other published algorithms). Cooked dishes are not considered a derivative of the recipe, and those are step by step instructions for creating the thing in question. Codes are one step further removed in that they give tolerances and the like, so they don't even describe an object. If I write, "You should not use md5 to store passwords." it's not like all programs storing passwords with bcrypt written by people who have read that sentence are derivatives of my copyrighted work.