Article 5 - Patentable Inventions
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. Paragraph 2 shall exclude patentability of the subject-matter or activities referred to therein only to the extent to which a patent application or a patent relates to such subject-matter or activities as such.