definiens: shall mean any and all ideas, inventions, data, writings, protocols, discoveries, improvements, trade secrets, materials ( whether or not patentable orprotectable as a trade secret ) or other proprietary information not generally known to the publicthat arise or are conceived or developed by ( a ) either Party, ( b ) any Affiliate of Company that isengaged in the Development or Commercialization of Licensed Products pursuant to thisAgreement, ( c ) any of Regeneron ’s Affiliates that are engaged in the Development orCommercialization of Licensed Products pursuant to this Agreement or ( d ) the Parties or theirAffiliates jointly, in each case ( ( a ) - ( d ) ), after the Opt - In Effective Date under or in connection withthis Agreement but only in each case ( ( a ) - ( d ) ) to the extent specifically related to any PDGFProduct in the Field, including, without limitation, information and data included in any Plans orRegistration Filings made under this Agreement