Duty Entitlement Pass Book extension permits continued DEPB validity under a Customs Act amendment substituting the prior expiry date. Extension of the Duty Entitlement Pass Book (DEPB) scheme by amendment under section 25(1) of the Customs Act, 1962, replacing the earlier expiry wording in paragraph 2 of Notification No. 89/2005-Customs with a new expiry date, thereby continuing the scheme's operative terms for the substituted validity period.