Article 4 - Patentable Inventions
(2) The following, in particular, shall not be regarded as inventions within the meaning of subarticle (1):
(c) schemes, rules and methods for performing mental acts, playing games or doing business and programs for computers;
(3) The provisions of subarticle (2) shall exclude the patentability of the subject matter or activities referred to in that subarticle only to the extent to which a patent application or patent relates to such subject matter or activities as such.