Patentable inventions
Article 1
(2) The following in particular shall not be regarded as inventions within the meaning of paragraph (1):
(c) schemes, rules and methods for performing mental acts, playing games or doing business, and programs for computers,
(3) Patentability of the subject matters referred to in paragraph (2) shall be excluded only to the extent to which a patent application or the patent relates to such subject matter as such.