(b) In no case does copyright protection for an original work of
authorship extend to any idea, procedure, process, system, method of
operation, concept, principle, or discovery, regardless of the form in
which it is described, explained, illustrated, or embodied in such work.


Section 103. Subject matter of copyright: Compilations and derivative works.

(a) The subject matter of copyright as specified by section 102
includes compilations and derivative works, but protection for a work
employing preexisting material in which copyright subsists does not
extend to any part of the work in which such material has been used
unlawfully.

(b) The copyright in a compilation or derivative work extends only
to the material contributed by the author of such work, as
distinguished from the preexisting material employed in the work, and
does not imply any exclusive right in the preexisting material. The
copyright in such work is independent of, and does not affect or enlarge
the scope, duration, ownership, or subsistence of, any copyright
protection in the preexisting material.


Section 104. Subject matter of copyright: National origin.

(a) Unpublished Works.--The works specified by sections 102 and
103, while unpublished, are subject to protection under this title
without regard to the nationality or domicile of the author.