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The WordPress copyscape plugin allows you to check posts and pages for duplicate content issues via the Copyscape API. 
A link is added on the post and page listing page next to the “Quick Edit” link that allows you to check for Copyscape issues. 
Links and examples of any Copyscape issues are returned.

WordPress Copyscape Plugin

The Wordpress copyscape plugin allows you to check posts and pages for duplicate content issues via the Copyscape API.

Copyscape

The Copyscape Premium plugin lets you check if a WordPress post is original before it’s published, by using the Copyscape Premium API to check for duplicate content on the web.
The plugin will add a ‘Copyscape Check’ button to your WordPress interface, allowing you to check your posts whenever you wish. You may also set the plugin to automatically check your posts when you click ‘Publish’ and/or ‘Update’.
When duplicate content is found, a report of matching pages is shown. You may also see a detailed comparison that highlights your content on the found page.
If you do not already have a Copyscape Premium account, please <a href="http://www.copyscape.com/redirect/?to=prosignup" title="Copyscape Premium sign up" rel="nofollow ugc">sign up</a>, <a href="http://www.copyscape.com/redirect/?to=propurchase" title="Purchase Copyscape Premium Credits" rel="nofollow ugc">purchase some credits</a>, and enable your <a href="http://www.copyscape.com/redirect/?to=apiconfigure#key" title="Copyscape Premium API page" rel="nofollow ugc">API access</a>. You may then begin using the plugin.

Copyscape Premium

The Copyscape Premium plugin lets you check if a WordPress post is unique before it's published, by searching for duplicate content on the web.

WordPress Copyscape Plugin vs Copyscape Premium