Adobe gives you a trail key witch you can change every 7 day so you can get free Adobe forever. You don't need to be a pro programmer to do this and you don't need a third party programs to get free trail for ever. And it updates so its not like other cracked versions you can download for Pirate Bay or sites like that. In my opinion you should have only 1 key that is supported by the program for trail version of the program. And for bought products you should have some like encrypted keys so people don't copy from one another. Also an IP verification to log in the bough programs should be used so people don't use others keys. The program which you have trail for should self destruct after 7 day. I hope you will look in to this and try to solve the problem.