How do i make a pdf editable but not copyable for my customers?

You can apply a security policy that prevents printing and extracting contents, but does allow filling in form fields. However, unless you also apply a file-open password it's trivial to remove it. And someone will always be able to take a screenshot of the file and get the contents out that way, of course... There's no real solution that's 100% secure, you'll just have to learn to live with that.