The Access Expiration plugin is a plugin from Multinc that adds a level of access control for particularly sensitive posts. For each post or category, you can limit the number of views and the amount of time that an item remains viewable by each user after he or she first accesses the post. Unlike other plugins that expire posts for all users at the same time, this plugin keeps track of every user?s viewing history so that each gets equal access time.
You can also impose separate limits for unregistered users, who are all considered as one single user.
When used in combination with the other plugins in the <a href="https://wordpress.org/extend/plugins/social-privacy/">Social Privacy</a> set, this plugin is useful for limiting the chance that any authorized user accidentally or deliberately forwards a private post to an unauthorized user.
Because authorized users may have legitimate reasons for accessing a post beyond the allotted time, the plugin gives users the simple option of requesting an extension of their viewing privileges.

Access Expiration

For each post or category, you can limit the number of views and the amount…

Based on the 3rd-party Category Access, this plugin provides the core functionality for restricting the access permissions of posts. This gives you the ability to permit only specific registered users to read certain posts or certain categories of posts.
This plugin is part of the <a href="https://wordpress.org/extend/plugins/social-privacy/">Social Privacy</a> set of plugins and it’s recommended that you install the entire set at one time to get complete control over access to your posts on your blog.
<h4>Differences between the original plugin and our plugin</h4>
The 3rd-party <a href="http://www.coppit.org/blog/archives/173" rel="nofollow ugc">Category Access</a> plugin provides the core functionality for restricting the access permissions of posts to certain registered users. For each user you can list the categories that he or she should have access to.
New features have been added to our version of this plugin to allow access to be restricted to specific users on a per-post basis, regardless of the categories. The plugin has also been enhanced to work well with the other plugins in <a href="https://wordpress.org/extend/plugins/social-privacy/">Social Privacy</a> set, which add similar restriction capabilities to email and feeds.
If you decide to stop using this plugin, there is an additional feature that lets you make all your protected posts “private” so that they’re not suddenly exposed to the public once the plugin is deactivated.

Social Access Control

Based on the 3rd-party Category Access, this plugin provides the core functionality for restricting the access permissions of posts.

Access Expiration vs Social Access Control