This excerpt taken from the ATVI DEF 14A filed Jul 29, 2005.
Restricted Shares and Restricted Share Units
The Company may award restricted shares and/or units which represent a conditional right to receive shares of common stock, cash or a combination of shares of common stock and cash in the future to selected participants. A grant of restricted shares gives a participant the right to receive shares of common stock subject to a risk of forfeiture based upon certain conditions. The forfeiture restrictions on the restricted shares may be based upon performance standards, length of service or other criteria as the Compensation Committee may determine.