Clemens Klein-Robbenhaar wrote on 2013-11-04:
  If you want to hide most pages to the anonymous user,
you need to
 "uncheck" the green "view" right checkbox for "Unregistered
Users" in the
 wiki admin.
 This can be overriden on the page level, exactly in the way you did it. 
Thanks Clemens, that was the case, and lead me one step further. Now an unregistered user
can see a page, but not the actual page content, only the heading and footer...
Regards,
Hugo
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Hugo Ahlenius
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