This excerpt taken from the ENTN DEF 14A filed Mar 9, 2005.
Amendment and Termination of the Plan
The Board may at any time amend or terminate the Purchase Plan, except that no such termination shall affect options previously granted and no amendment shall make any change in an option granted prior thereto that adversely affects the rights of any
participant. Under the Purchase Plan, an amendment to increase the number of shares reserved for issuance requires the approval of the stockholders of the Company. The Plan will terminate in October 2014, unless terminated earlier by the Board.