“useful article” means an article having an intrinsic utilitarian function that is not merely to portray the appearance of the article or to convey information; “work” means any artistic, literary or scientific work, or a derivative work; “work of applied art” means an artistic creation with utilitarian functions or incorporated in a useful article, whether made by hand or produced on an industrial scale; “work of joint authorship” means a work to the creation of which 2 or more authors have contributed. PART II- PROTECTION OF WORKS 3. � Protection of works (1) Every artistic, literary or scientific work shall be an original intellectual creation in the artistic, literary or scientific domain. (2) Every work shall be protected where it is fixed in some material form and irrespective of its mode or form of expression. 4. � Derivative works The protection of any derivative work shall be without prejudice to any protection of a pre- existing work or traditional cultural expression or expression of folklore incorporated in or utilised for the making of such a work. 5. � Subject matter not protected Notwithstanding sections 3 and 4, no protection under this Act shall extend to — (a) ­ any idea, procedure, system, method of operation, concept, principle, discovery or mere data;