This excerpt taken from the MLP DEF 14A filed Mar 27, 2006.
Ownership and Transfer Restrictions. The Administrator, in its absolute discretion, may impose such restrictions on the ownership and transferability of the shares purchasable upon the exercise of an Option as it deems appropriate. Any such restriction shall be set forth in the respective Award Agreement and may be referred to on the certificates evidencing such shares. The Holder shall give the Company prompt notice of any disposition of shares of Common Stock acquired by exercise of an Incentive Stock Option within (a) two years from the date of granting (including the date the Option is modified, extended or renewed for purposes of Section 424(h) of the Code) such Option to such Holder, or (b) one year after the transfer of such shares to such Holder.