The owner of a copyright has the right to exclude any other person from reproducing, preparing derivative works, distributing, performing, displaying, or using the work covered by copyright for a specific period of time. Copyrighted work can be a literary work, musical work, dramatic work, pantomime, choreographic work, pictorial work, graphic work, sculptural work, motion picture, audiovisual work, sound recording, architectural work, mask works fixed in semiconductor chip products, or a computer program. Only a concrete "medium of expression" can be copyrighted, facts, ideas, procedures, processes, systems, methods of operation, concepts, principles or discoveries cannot themselves be copyrighted. Items to be copyrighted must be original and not the result of copying another copyrighted property.