VAN KAMPEN UNIT TRUSTS, SERIES 823 TRUST AGREEMENT Dated: December 23, 2008 This Trust Agreement among Van Kampen Funds Inc., as Depositor, The Bank of New York Mellon, as Trustee and Van Kampen Asset Management, as Supervisor, sets forth certain...Trust Agreement • December 23rd, 2008 • Van Kampen Unit Trusts Series 823
