Well that is the same thing as using a password. THe problem with a password is that it has to be hardcoded. Which means once one person has the password or one of the possible passwords then everyone might as well have it.

I want a way to make each copy have it's own password. So people can't just send the password with the exe and then have it work.

I was thinking something like having the user get some info from thier comp and then enter that info on the webpage when they pay for and download the program and then have the password based off that user info. And have it encoded. My program would gather this data and encoded it the same way and then i would have an individual passsword for each user.

The thing is what is different on each persons comp but is easily accessable even for a novice computer user.