Protect entire page (including widget contents)?

Does this plugin do that?

Also – I’m sorely looking for something like this BUT one that only pops up when someone tries to view, say, a 3rd post from a particular page. ie: xxxx.com/main-page/particular-page/
Thus restricting access to that third piece of content if they don’t sign up for membership (or however you want to phrase it). Not for paid subscriptions – just for membership details.

With thanks for a great looking plugin

https://www.ads-software.com/plugins/content-protector/