I'm pretty sure i've seen badspot or someone say something about this idea before. In short, it wont happen. Its similar to why we cant disable other players saving bricks. If you don't want a script to be public, don't make it public, keep it to yourself.
There is no point in making a script encrypted anyway. The only two reasons I can see would be either the script is so terrible, that they don't want anyone else to be able to try to learn off it, and pick up bad habits or methods, or if they're a selfish idiot, and they want to keep their uber amazing 10/10 chatbot they copy-pasted off the forums private, but still share it with other people, so that only they can update it, and pretty much force everyone to go to them to get improvements for it.