This excerpt taken from the YDNT DEF 14A filed Apr 7, 2006.
Amendment and Termination. Our Board or the Compensation Committee may amend, alter, suspend, or terminate the 2006 Plan at any time. If necessary to comply with any applicable law (including stock exchange rules), the Company will first obtain shareholder approval.
Amendments, alterations, suspensions, and termination of the 2006 Plan generally may not impair a participants (or a beneficiarys) rights under an outstanding award. However, rights may be impaired (a) if necessary to comply with an applicable law or accounting principles (including a change in the law or accounting principles); (b) pursuant to a written agreement with the participant; or (c) during the pendency or in recognition of unusual or nonrecurring events.