Best protection system

hi there. i have this problem and would realy appreciate it if u can help.
i have a program that would be sold. now what i want if the buyer buys a
liscence, then he can install it on one server only , not multiple servers.
do u know any software or setup that can do that? our program is done in flash(action script)

Hi and Welcome!

Better ask a consultant. He knows your local market and what degree of annoyances due to copy protection is accepted there.

Thread moved since not hardware related.