In reality it all depends on how strong enforcement is in the Czech Republic and the European Union. However, the rights conferred to the holder of the patent and the conditions under which the patent can be used without licensing are all given in Section 5 of the Trade-Related Aspects of Intellectual Property Rights (TRIPS). Article 1 of the TRIPS Agreement gives the member countries the ability to determine how the agreement will be enforced within their own legal systems. At this point it is where we reach the grey area. If a member country has made no provisions for enforcing the TRIPS Agreement, then patents and other forms of intellectual property can be left dangling in the air. There are examples in the Interpretations of the Agreement for cases where disputes have arisen but generally these involve countries rather than individuals. At least on paper member countries are supposed to enforce the agreement. Whether it happens in practice is a different story.