Badi Jones

Duplicate Content Cure is an extremely simple plugin that makes WordPress more Search Engine 
friendly (And therefore improving SEO). It does this by preventing search engine spiders/bots 
from accessing pages like Archives, Tags, and Categories, which tend to contain duplicated content 
from elsewhere on your site. This is achieved by adding nofollow, noindex to 
these problem pages.
Duplicate Content Cure doesn’t have a lot of features that other SEO plugins have, but 
it also is lightning fast by comparison.

Duplicate Content Cure

Duplicate content cure is a simple plugin that improves SEO by preventing search engines from indexing pages that contain duplicate content.

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.

Duplicate Content Cure vs Copyscape Premium