a system for creating copy restrictive media is disclosed . the system comprises printing a first pattern of microdots on a first set of documents and printing a second pattern of microdots on a second set of documents . a first key code is associated with the first microdot pattern , which allows a copy machine to copy the first set of documents , and a second key code is associated with the second microdot pattern , which allows a copy machine to copy the second set of documents . this system allows individual copyright owner to insure that no one else is able to reproduce their copyrighted documents .