I'm using Specific Post/Page Access Restrictions to protect several pages of content. I have added the page ID to the "Specific Post/Page Access Restrictions" section in S2Member, and they appear to be locked down on that admin side.
Here are a few screen shots, showing the page as being protected:
Now if you go to my homepage (http://www.madhedgefundtrader.com/) and use the search box and type in the page title "Las Vegas Confirmation Lunch & Details" you will see the full page copy of the "protect page" revealed in the search results. It also comes up if people search on various keyword phrases within the protected page.