This excerpt taken from the ATVI DEF 14A filed Jul 29, 2005.
International Stock Purchase Plan
Any employee of any Foreign Subsidiary who meets the following requirements is eligible to participate in an Offering Period (as defined below) under the International Purchase Plan:
Notwithstanding the above, an employee of a Foreign Subsidiary may not be eligible to participate in the International Purchase Plan if his or her participation is prohibited by the law of any country which has jurisdiction over him or her or if he or she is subject to a collective bargaining agreement that does not provide for participation in the International Purchase Plan.
As of July 1, 2005, approximately 470 employees of Foreign Subsidiaries would be eligible to participate in the International Purchase Plan.