definiens: means ( a ) the Purchaser, ( b ) with respect to any Product, any person to which any right to Exploit such Product is licensed, sublicensed, assigned or transferred by the Purch aser or any of its Affiliates, ( c ) with respect to any Product, any person to which the right to Exploit such Prod uct is licensed, sublicensed, assigned or transferred by a ny person described in clause ( b ) above, ( d ) with r espect to any Product, any successor or assign of any person desc ribed in clauses ( a ), ( b ) or ( c ) above with respect to such person ’s interest in such Product, and ( e ) with res pect to any Product, any Affiliate of any person de scribed in clauses ( a ), ( b ), ( c ), or ( d ) involved in the Explo itation of such Product with or on behalf of such p erson