Article 2 (Subject-matter of the patent and exclusions from patentability)
2. Under Article 1, the following, in particular, shall not be regarded as inventions:
c) schemes, rules and methods for performing mental acts, playing games or doing business, and programs for computers;
3. The provisions of paragraph 2 shall exclude patentability of the subject-matter or activities referred to therein only to the extent to which an application or a patent relates to such subject-matter or activities as such.