set up a registration key system on my website

I am selling a software , now i need to set up a system where user get new registration key for my software , which will unlock the software. Now i am using winlicense to create reg key . It also helps in protecting software [login to view URL] you can also download their help file from there. now, there are 2 types of customers one who got lifetime licence and other who got to pay per month to get new licence every month. so, those who paid for lifetime license they should receive new reg key every month without paying anything extra. however , other ones should get reg key once payment gets cleared in a month. I am using butterfly marketing script to create my site. alone with reg key , they should also show 2 more values (which i will provide) . These 2 values will remain same throughout membership , but there should be function to change that if admin ( me) want. basically these 2 values will be gmail id and password. so every user will be having 3 things , reg key , email id and password (provided by us) . now , if he lost his reg key for some reason , he can come back hit some button and reg key , email , password should be shown to him again. I had one other coder who was working with this. but he left work due to some personal problem . before posting this bid , he had something to add , here's his comment about this project I've attached the rather simple Perl script that calls the keygen file and prints back the license key. There's a good example of a PHP one in the winlicense stuff that you sent me. Essentially all that happens is that the user fills in the fields (at [login to view URL]) - or you can generate them on your site using the fields template in the admin section there - and then the script runs the (ANSI C) keygen file and returns the license key. I am attaching sample pearl script here in this bid request. Now , if you can just direct me , my other coder can do the work, right now he is confused. but if you can alone handle this thing , that will be also good. Thanks in advance