This excerpt taken from the VRSN 10-K filed Jul 12, 2007.
3.1.3 Auto-Renew Grace Period
The Auto-Renew Grace Period is a specified number of calendar days following an auto-renewal. An auto-renewal occurs if a domain name registration is not renewed by the expiration date; in this circumstance the registration will be automatically renewed by the system the first day after the expiration date. The current value of the Auto-Renew Grace Period is 45 calendar days. If a Delete, Extend, or Transfer occurs within the Auto-Renew Grace Period, the following rules apply:
Delete. If a domain is deleted within the Auto-Renew Grace Period, the sponsoring Registrar at the time of the deletion receives a credit of the Auto-Renew fee. The domain immediately goes into the Redemption Grace Period. See Section 3.2 for a description of overlapping grace period exceptions.
Extend. A domain can be extended within the Auto-Renew Grace Period for up to a total of ten years. The account of the sponsoring Registrar at the time of the additional extension will be charged for the additional number of years the registration is extended.
Transfer (other than ICANN-approved bulk transfer). If a domain is transferred within the Auto-Renew Grace Period, the losing Registrar is credited with the Auto-Renew charge and the year added by the Auto-Renew operation is cancelled. The expiration date of the domain is extended by one year up to a total maximum of ten and the gaining Registrar is charged for that additional year, even in cases where a full year is not added because of the 10-year registration term maximum limitation.
Bulk Transfer (with ICANN approval). Bulk transfers with ICANN approval may be made during the Auto-Renew Grace Period according to the procedures in Part B of the ICANN Policy on Transfer of Registrations between Registrars. The expiration dates of transferred registrations are not affected. The losing Registrars account is charged for the Auto-Renew.