Sharing certificates on multiple servers increases risk of exposure. Auditing becomes more complex, reducing accountability and control. If a private key becomes compromised, it can be difficult to trace and all servers sharing that certificate are at risk. Because sharing certificates degrades security, the VeriSign (Symantec) certificate subscriber agreement prohibits customers from using a certificate on more than one physical server or device at a time, unless the customer has purchased additional server licenses. VeriSign (Symantec)’s licensing policy allows licensed certificates to be shared in the following configurations: redundant server backups, server load balancing, and SSL accelerators.