I have a requirement that In a member restricted page, I would need to access a few fields: Title, keyword, tags and put it in header -- Meta tags section. This is for search crawler to properly crawl secured pages with basic information only. How do I bypass page security and always output these meta tags?

detect the user-agent as bot and render a different result?

Thank you @Mike Chambers for the ideas. I'm pretty new to umbraco. I can detect user agent but then --> the page auto goes to login view when I hit the page, how do I extract the field value and render it differently ( without need to login member) in the partial view when I debug, the current page item Model points to access denied page, I cannot get anything for the current page unless logged in.

Sure, so that was my suggestion, do not use the umbraco backoffice restrict public access functionality and implement on the page yourself.. with an

case bot -> serve minimal
  case user.isAuthenticated and has access show page
  case user.isAuthenticated and not has access (your own logic) redirect to denied page
  case user.isNotAuthenicated redirect to login page

prob not what you are after...

@Mike Chambers thank you so much Mike! What a champ will try next Monday and thank u in advance if I have further questions, really appreciated!

+1 for keeping the "restrict public access" but extending the public access checker/handler. Otherwise you end up reinventing the entire Umbraco access restriction functionality, including the backoffice UI parts. That said, I think whoever made this requirement is not aware that the default behavior is to redirect unauthorized visitors to a sign-in page. It sounds like the requirement was made assuming that an "access denied" page is shown, which could then easily emit page metadata.