Контекст:
Analysis of the disclosure content of the relevant prior art documents would be helpful to determine whether the surgical suture to be produced and sold in Europe is part of the prior art, i.e. was already known at the priority date of the PCT application. If this would be the case, there would be a further reason that the surgical suture to be produced and sold in Europe does not infringe the claims of the PCT application, since according to Case Law of the Federal Supreme Court of Germany subject-matter which is part of the prior art cannot fall under the scope of protection under the doctrine of equivalence (the so-called "Formstein defense").

Я перевела как "Защита неподлежащая опровержению" . Какие еще более точные варианты могут быть? Здесь явно слово Formstein немецкое, означает что-то вроде форма для кирпича, кирпич...