This excerpt taken from the VRSN DEF 14A filed Jul 27, 2007.
Employees generally are eligible to participate in the Purchase Plan if they are customarily employed by VeriSign or by a participating subsidiary for more than 20 hours per week. VeriSign or a participating subsidiary also must have employed the employee at least ten days prior to the beginning of the offering period. Eligible employees may select a rate of payroll deduction between 2% and 25% of their compensation and are subject to certain maximum purchase limitations.
As of June 30, 2007, approximately 4,000 employees, including all of our executive officers, were eligible to participate in the Purchase Plan.