“Restrict Registration” is a plugin for WordPress that allows you to control 
who is registering on your blog. This plugin uses simple blacklists and 
whitelists to define who can register for your blog, and who is restricted. Use 
simple literal matching, flexible asterisk wildcard matching, or powerful 
regular expression matching: it’s your choice! The options page is clear and 
easy to use. Set your lists, and you’re done!
This plugin was inspired by WP-Deadbolt, but has been completely rewritten and 
redesigned, and several new features have been added.

Restrict Registration

Use simple blacklists and whitelists to control who can and cannot register on your blog.

lienann

This plugin allow to set access level value for users and materials and limit 
access to materials of a specific type (posts, pages, custom post types) when 
user access level lower then material access level.
Also this plugin creates a new capabilities:
<ol>
<li>dal_admin – capability to change plugin settings</li>
<li>dal_edit – capability to change user access level</li>
</ol>
Attention to developers! 
Filters used in this plugin does not work when using get_posts() with 
the parameter ‘suppress_filters’ => true.
Install script don’t assign any values of user access levels and post access levels. 
By default post access level = 100 and user access level = 0 (except Administrator = 100 ). 
By default access to posts is limited in front-end. There is an option 
“Should we apply restrictions in admin console?” in plugin settings to limit access in 
administrator interface too. 
Users can assign records access level equal or lower their own access level.
Languages: English, Русский
I apologize for possible mistakes in plugin translation. 
I will be glad to accept the help with the correct translation of a plugin into 
English and to correction of my mistakes.

Data access levels

Restrict access to posts by user access level.

Restrict Registration vs Data access levels