Kyle Gilman

This plugin does one thing and one thing only. It adds the text <code><meta name="robots" content="noindex"></code> to the header of any password-protected post. Google and all other respectable search engines will leave your password-protected pages out of their search results.

Noindex Password-Protected Posts

Disables search-engine indexing for all password-protected posts.

LionScripts.com

LionScripts’ Site Maintenance & Noindex Nofollow is a very useful Site Maintenance plugin, which provides you space to work on your site, when you don’t want to make it live for the people. Apart from just blocking the rest world, the plugin also adds nofollow noindex to your wordpress site, if opted.
<h4>Plugin Features</h4>
<ul>
<li>Adds No-Index and No-Follow if opted</li>
<li>Change your site’s state into developent mode</li>
<li>Works Without any conflict on your existing plugins and themes</li>
<li>Free 24X7 Support</li>
</ul>
For all kind of support and questions, please visit http://support.lionscripts.com/ and provide detailed explaination of the respective issue.
Software specification are available at: 
http://www.lionscripts.com/product/maintenance-and-noindex-nofollow/

LionScripts: Site Maintenance & Noindex Nofollow Plugin

LionScripts' Site Maintenance & Noindex Nofollow is a very useful Site Maintenance plugin, which provides you space to work on your site, whe …

Noindex Password-Protected Posts vs LionScripts: Site Maintenance & Noindex Nofollow Plugin