We know that when a site resolves to use a paid source on your site, it seeks design and differentiation at the same time.
But for the user to see the source working on the page, the developer must somehow declare it to the client to see the source in behavior.
With this, do paid sources end up becoming free? Since, in some way it is exposed to present to the client and allow the browser to display it in action ..
Or are there techniques to inhibit other people from capturing these sources, perhaps something with Javascript, HTTP technique to inhibit other hosts, ...?