For avoiding unlicensed copies, Chat Essentials, Inc. has implemented license verification by generating serial numbers for each installation. A serial number is generated according to your SERVER IP ADDRESS. Unfortunately this method has some problems such as changing IP address of your server. If you changed your server IP address you can connect Chat Essentials, Inc. at info@ChatEssentials.com to renew your serial no. each user can change his/her IP address 4 times a year.