When you drag the widget onto your canvas, an icon will be visible in Design mode. However, the icon will not publish or preview.
Future versions of this widget will include options to choose what content is accessible on your page and what is not.
Please note: This widget cannot prevent visitors from downloading your site's content; it can only deter or thwart. There are methods readily available to circumvent the controls this widget applies. However, this widget will help block attempts from the general public.