Tax exemption for specified secured redeemable non-convertible bonds requires holder registration to qualify for the benefit. Central Government specifies 10-year 9% tax-free Secured Redeemable Non-Convertible Bonds (D Series) issued by the National Hydroelectric Power Corporation Limited as specified securities under the relevant item of section 10 of the Income-tax Act, making them eligible for the stated tax exemption. The exemption is conditional on the holder registering his name and holding with the issuing corporation; entitlement to the benefit is admissible only upon such registration.