Is there any way to privatize the content of an iframe?

I'm working with ArcGIS, creating a map viewer. You can apparently inclute that viewer in your web page which is what I want (a web application). The issue which I am finding is that the method to insert it into my html document is through a . The src contains a url address that, who knows how to use browser inspector, he can easily obtain and so he would not need to use my application. I would have that url and could access directly by copyng and pasting it in browser. (I attach the code):

<iframe id="visor" src="http://estoEsLaURLdelVisor"></iframe>

I wish they could not get that url, I don't know if there is any way to privatize the content of iframe, or if someone knows ArcGIS, that person could give me some solution so that viewer that I generate, it can not be public.

Thank you very much.