This excerpt taken from the VRSN 10-K filed Jul 12, 2007.
1.1 EXTENSIBLE PROVISIONING PROTOCOL
Registry Operator intends to implement the Extensible Provisioning Protocol (EPP) in conformance with the Proposed Standard and Informational RFCs 3730, 3731, 3732, 3733, 3734, 3735, and 3915 published by the Internet Engineering Task Force (IETF) and/or any successor standards, versions, modifications or additions thereto as Registry Operator deems reasonably necessary. Subject to the Migration to Extensible Provisioning Protocol Plan described in Section 6 below, Registry Operator will support EPP in conformance with the aforementioned standards. Implementation of EPP is subject to Registry Operator reasonably determining that (i) the standard can be implemented in a way that minimizes disruption to customers; and (ii) the standard provides a solution for which the potential advantages are reasonably justifiable when weighed against the costs that Registry Operator and its registrar customers would incur in implementing the new standard.