Is there a simple way to "lock" a compiled script?

[xuzo]

I want to sell some small scripts, simple stuff for a few bucks.

How can I make sure users need a password to use it? 

Or maybe a licence that is good for a year? Lifetime?

I realize this is a very broad question...but can somebody point me in the right direction to get this done?

Scripts will be small automation snippets.

Thanks

THanks

[InunoTaishou]