Keisuke Nemoto

This plugin moving attachment file to other protected directory.
<pre><code>/wp-content/uploads/path/to/file -> `/wp-content/uploads/protect/path/to/file` </code></pre>
But, attachment file url is not changed. WordPress will return the attachment file content, check the access permission.

Invisible

Abhisek

WordPress by default restricts user role subscriber from reading private content.Give subscribers private content read access and turn your WordPress site into a mini membership site.Let visitors signup as Subscriber to read Private Content or call it Members Only Content.This plugin also blocks dashboard access for subscribers(even if they try /wp-admin/), hides admin bar from front end, and adds an optional widget to let people register, log in and log out of your site.No fancy features, smart and simple plugin to attract more subscribers.You can also use the included shortcode to place a call to action within post and page content.Before Using Please Read The Installation Instructions First.
Note: If you want to send newsletters to your subscribers containing private content links, you may like another Free plugin I developed.It redirects non-logged users to the login page when they follow a link to private content.WordPress by default redirects all non-logged users to a 404(content not found) page when they follow a link to private content, and that confuses members.Check out <a href="https://wordpress.org/plugins/private-content-login-redirect/" rel="ugc">Private Content Login Redirect</a>.
If you like this plugin, please consider leaving a <a href="https://wordpress.org/support/view/plugin-reviews/mini-membership" rel="ugc">review</a>. Thank you!
Follow the developer on <a href="https://twitter.com/twitabhisek" rel="nofollow ugc">Twitter</a> 
Visit <a href="http://increasy.com" rel="nofollow ugc">Developer Website</a>
Download My Other Plugins
<ul>
<li><a href="https://wordpress.org/plugins/private-content-login-redirect/" rel="ugc">Private Content Login Redirect</a></li>
<li><a href="https://wordpress.org/plugins/wp-admin-color-schemes/" rel="ugc">WP Admin Color Schemes</a></li>
<li><a href="https://wordpress.org/plugins/rainbow-status/" rel="ugc">Rainbow Status</a></li>
<li><a href="https://wordpress.org/plugins/restrict-dashboard-access/" rel="ugc">Restrict Dashboard Access</a></li>
<li><a href="https://wordpress.org/plugins/romance-admin-color-scheme/" rel="ugc">Romance Admin Color Scheme</a></li>
<li><a href="https://wordpress.org/plugins/frame-breaker/" rel="ugc">Frame Breaker</a></li>
<li><a href="https://wordpress.org/plugins/inspire-dolly/" rel="ugc">Inspire Dolly</a></li>
</ul>

Mini Membership

I was writing my own plugin and couldn't figure out why admin-ajax kept redirecting me to my home page, then realized it was this plugin that was the culprit. To the author: PLEASE update your code so it doesn't interfere with ajax calls. I fixed the issue by adjusting the following code thusly 
    function mm_block_dashboard_access() {

            if (!defined( 'DOING_AJAX') && is_admin() && ! current_user_can( 'edit_posts' ) ) {
                    wp_redirect( home_url() );
                    exit;
            }
    }



Does what it says...but has a flaw that took me hours to fix

Get a Mini Membership site to attract more Subscribers.Give your audience Private Content read access when they sign up.Read installation instructions …

Invisible vs Mini Membership