If someone attacks you with a bogus patent, then it would cost 20.000€ to request invalidation of the bogus patent. From a quote near the bottom of the article

If someone attacks you with a bogus patent, then it would cost 20.000€ to request invalidation of the bogus patent. From a quote near the bottom of the article: > Typically, in response the sued company could be advised to demand cancellation of the Unitary Patent by means of a counterclaim but in that case, it will be required to pay a court fee of EUR 20,000.