Though the object behind DEPB etc is to neutralize the incidence of customs duty payment on the import content of export product DEPB credit/duty drawback receipt do not come within the first degree source as the said incentives flow from Incentive Schemes enacted by the Government or from s. 75 of the Customs Act. Such incentives profits are not profits derived from the eligible business u/s 80-IB. They are ‘ancillary profits’ of such undertakings