1.1. Covenant Not to Revoke/Invalidate/Oppose. P&G hereby covenants not to challenge the validity or enforceability of the PATENT RIGHTS, including: (a) opposing or participating in an opposition or revocation proceeding before the European Patent Office or before any national court in a country being a Contracting State of the European Patent Convention that is competent to handle patent matters, or (b) filing or participating in any other action in any European court or European administrative agency that is intended to and/or could result in the PATENT RIGHTS being diminished in any way.