All I can say is that no matter what you do, the licensing can be nulled out completely and the script run normally.

While that's true, it doesn't mean that putting in some enforcement is meaningless. A determined person will be able to break into your house as well - all they need to do is break a window, drill out the lock, pick the lock, etc. However, entering your house by breaking the protection is in most countries a more severe crime than opening an unlocked door and entering the house. If something gets stolen, your insurance company might not pay if you didn't use locks.

If your program makes some attempt to enforce a license, it takes a conscious action to bypass it, and someone breaking it can't plead innocense. They also might lose their right to support if they modify the program in any way (yeah, I know, it's hard to find out whether they did). It raises the bar.

Abigail