This excerpt taken from the MRVL 10-K filed Apr 13, 2006.
SECTION 4. SHARES RESTRICTED.
Unvested shares will be considered Restricted Shares. You may not sell, transfer, pledge or otherwise dispose of Restricted Shares without the written consent of the Company, except as provided in the next sentence. You may transfer Restricted Shares to your spouse, children or grandchildren or to a trust established by you for the benefit of yourself or your spouse, children or grandchildren. However, a transferee of Restricted Shares must agree in writing on a form prescribed by the Company to be bound by all provisions of this Agreement.