Article 6. Patentable inventions
2. The following 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. The provision of paragraph (2) shall exclude the patentability of subject matter or activities referred to therein only to the extent of which a patent application or patent relates to such subject matter or activities as such.