Exhibit 1.1 VAN KAMPEN UNIT TRUSTS, SERIES 781 TRUST AGREEMENT Dated: July 23, 2008 This Trust Agreement among Van Kampen Funds Inc., as Depositor, The Bank of New York Mellon, as Trustee, Van Kampen Asset Management, as Supervisor, sets forth certain...Trust Agreement • July 23rd, 2008 • Van Kampen Unit Trusts Series 781
WITNESSETH:License Agreement • July 23rd, 2008 • Van Kampen Unit Trusts Series 781 • New York
