definiens: shall mean ( a ) payments and other consideration re ceived from Third Parties with respect to the commercialization of a Collaboration Product, including any license fees, milestone payments, royalties or other payments ( in cluding the fair market value of any consideration received ) in connection with the license, sublicense, assignm ent or transfer of rights with respect to such Coll aboration Product ( to the extent not included in Net Sales ), and ( b ) any other operating income received from or expense owed to Third Parties in connection with an activit y that is not part of the primary business activity of a Party under the Agreement but is considered and approved by the Parties as income or expense for purposes of the Agreement, which may include : ( i ) actual inventory write - offs of any Collaboration Product ; ( ii ) the c ost and expense of prosecuting, maintaining and enforcing p atent, trademark and other intellectual property ri ghts and defending against claims of infringement ; and ( iii ) product liability insurance to the extent the Part ies obtain a joint policy