These excerpts taken from the ATVI 8-K filed Oct 23, 2006.
SECTION 20. TAX WITHHOLDING.
The Company shall notify a Participant of any income tax withholding requirements arising as a result of a purchase of Stock acquired pursuant to this Plan, the disposition of such Stock or any other event occurring pursuant to this Plan. The Company shall have the right to withhold from such Participant such withholding taxes as may be required by law, or to otherwise require the Participant to pay such withholding taxes. If the Participant shall fail to make such tax payments as are required, the Company or its Subsidiaries shall, to the extent permitted by law, have the right to deduct any such taxes from any payment of any kind otherwise due to such Participant or to take such other action as may be necessary to satisfy such withholding obligations.