“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.

Md Meraj Ahmed

Restrict custom post type, pages or posts to logged in users.
From admin section you can select, which content type you want to restrict. As per your select a content restection meta box will appear in the content 
add section. If you want to restrict content then just select yes and that content would be restricted

Content Restrict

Restrict custom post type, pages or posts to logged in users.

Restrict Registration vs Content Restrict