Will my protected document libraries be hidden from search engines?
The Document Library Pro plugin will automatically hide your protected categories and any content they contain from search engines. It does this by adding a noindex,nofollow meta tag to these pages, as well as settings X-Robots-Tag in the response header.
In addition, the plugin will hide your protected content from sitemaps. The plugin currently includes support for the sitemaps provided in WordPress SEO (Yoast) and All In One SEO Pack.
Whilst this should be sufficient, we can’t absolutely guarantee that protected content won’t appear in search engine results. Some search engines do not respect these meta tags. It’s also possible that your categories were indexed before you installed our plugin, and so will still appear in the results.
If searching the knowledge base hasn't answered your question, please contact support.