mortenf

This plugin adds optional per-page user name and password protection, implemented using standard HTTP protocol authorization headers, thus triggering the standard user/password dialog of the browser, and making it possible to make the browser store the credentials.
Subpages of a protected page are protected with the same user name and password as their parent.
Protected pages and their subpages do not show up in menus, search results and page lists.
<h4>Usage</h4>
<ol>
<li>When editing a page, locate the section titled “Page Protection” (probably located near the bottom of the right sidebar).</li>
<li>Check the box “Protect page and subpages”, and provide a user name and password combination.</li>
<li>Optionally, check the box “Make page and subpages searchable”, if you want the page and its subpages turn up in search results, but only with their title, not their content.</li>
<li>Save your page.</li>
</ol>
<h3>License</h3>
Copyright (c) 2009 Morten Høybye Frederiksen <a href="mailto:morten@wasab.dk" rel="nofollow ugc">morten@wasab.dk</a>
Permission to use, copy, modify, and distribute this software for any 
purpose with or without fee is hereby granted, provided that the above 
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES 
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Page Protection

Protect pages and their subpages with user name/password, and keep protected pages from showing up in menus, search results and page lists.

Arnan de Gans

Tired of spam bots in your WordPress and ClassicPress website? Do you want to get rid of false registrations and other spammy nonsense? Don’t wan’t to use a clumsy and user-unfriendly Captcha? Don’t want to use a Captcha from Google or other big-tech company period?
Meet No-Bot Registration, easy to use, superior protection without making it hard for your visitors. Easily blacklist (partial) email addresses and domains so they can no longer register an account.
Create one or more questions and a set of possible answers for them and visitors have to answer your question when they register. 
If they answer wrong, they get denied their account.
Questions can be as simple as “1 + 1”, with possible answers being 1, one or uno. That way you can plan for eventualities and how people interpret your question.
<h4>Features</h4>
<ul>
<li>Protect registration forms</li>
<li>Protect the WooCommerce checkout form if you let people register from there</li>
<li>Protect your blog comment form</li>
<li>Prevents comment spam, trackback spam and other nuisances with ease</li>
<li>Set up multiple security questions to further confuse bots</li>
<li>Blacklist any email, domain or tld you don’t like</li>
<li>Configurable notification messages for users failing the security tests</li>
</ul>

No-Bot Registration

Prevent bots from creating accounts by blacklisting domains and usernames and present people with a human friendly security question.

Page Protection vs No-Bot Registration