Extend that to everything you ever make publicly available.
Not just scripts, put it in with missions, addons, pictures, textures, models and whatnot. Everything you make available, make sure everyone knows what they can do with it.
It would be better if you just made a standard text in which you allow/disallow use of the thing, and include that with every readme.
Then you can make exceptions in a few cases and so on.
And now I'm rambling.