I am looking for recommendations for the best PHP copy protection. The key feature in the copy protection is to able to be able give people UNIQUE serial numbers so that I can control who installs or uses the scripts on their web host. This way unauthorized users won't be able to install or run the program. Someone suggested this program: http://www.codelock.co.nz/tracker.html What I need to happen... i.e. 1. Jimmy uploads the php files to his website 2. Jimmy runs the program and then it asks for a serial number 3. We give jimmy serial number and to unlock it so that the script will work 4 If Jimmy tries to give the script to his friend Teddy, Teddy won't be able to use the script since he needs the serial number which is unique for each person and can only be used one.