Common use of Contested validity Clause in Contracts

Contested validity. If TACTIC, a TACTIC successor, a TACTIC sublicensee of the rights granted hereunder, or a person or entity Controlled by any of the preceding entities, intends to challenge the validity or enforceability of any of the XOMA Patent Rights, whether through a declaratory judgment action, opposition, post-grant proceeding or otherwise, then such entity shall: (a) [***] and (b) [***].