Any piece of software which, like a simple recipe, cannot be expressed any other way is, likewise, not copyrightable. Theoretically. Likewise, there undoubtedly exist many recipes which are copyrightable, presuming they're creative and expressive enough, and are not the only way to express the ingredients and method of preparation. For example, a method of preparation written in iambic pentameter, perhaps with some other flourishes for good measure. You would be free, of course, to extract and copy the simple recipe from such a work.
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