This excerpt taken from the GPS DEF 14A filed Mar 28, 2006.
Nontransferability of Awards
Awards granted under the Plan may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated, other than by will or by the applicable laws of descent and distribution. If permitted by the Committee (at its discretion), a participant may designate one or more beneficiaries to receive any exercisable or vested Awards following his or her death. Notwithstanding the foregoing, a Participant may, if the Committee (in its discretion) so permits, transfer an Award granted on or after January 24, 2006, to an individual or entity other than the Company. Any such transfer shall be made in accordance with such procedures as the Committee may specify from time to time.