Make our product licensed

[waqasahmed996]

i want that my product should be a licensed product. if i ll give code to a person than that person should not be able to sell it further advance. i really have no idea how can i do this.please guide me

i have my product on a server. Is it possible every time script should compare date from that database.please guide me from first step

i ll be vary thankful to you

[Weedpacket]

http://www.zend.com/en/products/guard/

[waqasahmed996]

Thanks for reply
Is it possible that i have a database and file in my own server. i entered a key in database of my own server. when i will sell this code then when code is run first time ( on whatever server) then database of my own server (if a file of my own server is included in original script ) will be updated and add their server name against key. now whenever application will run first time then it will be checked from my own server that key and server name is correct.

But the problem which i am facing that ajax (if information is send through ajax in php) is not sending information on another domain name in firefox and advanced IE versions

Please give me some idea about this