Expert advisor Make this a demo version to work on demo accounts only

I have this expert advisor I want people to test it I just need a code place within it to make it only work on demo accounts and not live accounts and where they can’t steal my code or copy it along with a expiry date


I will also like the ea to have a code to let it only work with a person account number only.so if I sell it that person can’t pass it on to another person to make money this feature I can turn off or on for myself