English to Czech Law/Patents Law: Contract(s)

No Third Party has threatened or, so far as it is aware, is currently threatening proceedings in respect of such infringement, and none of its Intellectual Property Rights are the subject of any actual or, so far as it is aware, threatened challenge, opposition or revocation proceedings

challenge, opposition or revocatoin proceedings - oponentní, námitkové řízení a řízení o zrušení?