Directory / plugin
NoLiP – Nofollow Links in Posts Reborn
v2.0 · by patrickcurl
Adds the rel="nofollow" to links in posts within a selected category. Useful for sponsored posts.
About this plugin
The NoLiP plugin enables you to add the “nofollow” attribute into links in a post within a specified category. This plugin is useful if you are doing sponsored posts. You can set the plugin to add the “nofollow” attribute for posts older than “X” days.
Originally the Nofollow Links in Post Plugin found here:
http://www.themiak.com/wp-plugins/nofollow-links-in-posts/