This excerpt taken from the VRSN DEF 14A filed Apr 10, 2006.
The vesting of awards will be determined by the committee, provided that the vesting of awards granted to executive officers and directors will be determined by the compensation committee. Options and stock appreciation rights will generally vest over four years (25% cliff vesting after one year and, thereafter, 6.25% vest quarterly until fully vested). Restricted stock awards generally vest on the second anniversary of issuance, after which two-thirds of such shares may be sold or otherwise transferred and the remaining one-third of the shares may be sold or otherwise transferred on or after the third anniversary of the issuance. Restricted stock
units will generally vest over four years as follows: 10% on the first anniversary of the date of grant, 20% on the second anniversary of the date of grant, 30% on the third anniversary of the date of grant, and 40% on the fourth anniversary of the date of grant.