If a search engine spider does not have access to that page (because it's behind a login), it will never see the link and therefore there will be no value passed through.
Best posts made by AlexFusman
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RE: If a link is located behind a log-in will it pass any value?posted in Link Building
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RE: Will Google display the "@" Symbol in a SERP Title?posted in Technical SEO
Yes, Google will display the @ symbol in your title. I am fairly confident that I have seen titles with @ in the search results. I have not been able to find an official source to back up this information though.
You should just do a quick experiment - make a test page on which you use the symbol in the title, get the page indexed and then search google for "site:test page url" and see how it shows up.