(a) Copyright protection subsists, in accordance with this title, in
original works of authorship fixed in any tangible medium of
expression, now known or later developed, from which they can be
perceived, reproduced, or otherwise communicated, either directly or
with the aid of a machine or device. Works of authorship include the
following categories:
(1) literary works: (2) musical works, including any accompanying
words; (3) dramatic works, including any accompanying music; (4)
pantomimes and choreographic works; (5) pictorial, graphic, and
sculptural works; (6) motion pictures and other audiovisual works; and
(7) sound recordings.
(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.