MOUNTAIN VIEW, CA–(Marketwire – 11/23/09) – VeriSign, Inc. (NASDAQ: VRSN – News ) today announced that MarkMonitor , the global leader in enterprise brand protection, is strengthening the online authentication it offers to customers by joining the VeriSign Identity Protection (VIP) Network. As a VIP Network member, MarkMonitor can offer its customers strong, two-factor authentication whenever …