Comment blacklisting works well, but what if you actually want to stop someone from even reading your blog? This plugin will take care of that for you.
It uses .htaccess file modifications to deny access to your blog from particular IP addresses (Deny from) and then follows up with an ErrorDocument 403 redirect to a URL of your choice. It doesn’t hook into WordPress, which makes it a lot faster due to no database or PHP calls.

WP-BlockYou

A plugin that can be used to block or "ban" users via their IP address from viewing your blog, and then redirecting them to a URL of your ch …

A WP Life

A most widely searched plugin feature by all the photography sites. Authors wants to block user to copy there image, content from his site, then just install this plugin and refer the how plugin works question after this line.
Q. How Right Click Disable plugin works?
Ans. Simply go to plugin setting menu page and set enable or diable right click option for admin & visitors of your whole website.
Features:
<ul>
<li>Right Click Disable For Visitors and Users</li>
<li>Right Click Disable For Admin</li>
<li>Customizable Right Click Disable Message</li>
</ul>

Right Click Disable OR Ban

Disable Right Click On Website to secure your pages.

WP-BlockYou vs Right Click Disable OR Ban