mtx_maurizio

This plugin adds a box that contains the license of the article (or any other information you want to enter). The box can be closed with an animation effect. The contents of the box, its color and the effect of closure can be configured in the Settings page. This plugin has been developed as an example of a tutorial on building plugins on <a href="http://www.yourinspirationweb.com" rel="nofollow ugc">Your Inspiration Web</a>

Mtx License Box

This plugin adds a box containing the license at the end of each article

Jarkko Laine

WP License Manager is an easy to use plugin that will turn your WordPress site into a license manager that can be used for WordPress themes, plugins and other downloadable products.
Downloadable files are stored in Amazon Simple Storage Service (S3) to keep them safe from people without a license.
Possible uses for WP License Manager:
<ul>
<li>Hosting your own premium plugins and themes and serving updates to them.</li>
<li>Hosting private plugins that you don’t want to share in the open.</li>
<li>If you get more creative, the license manager plugin can be extended to be used for all kinds of digital goods; downloadable games, for example.</li>
</ul>

WP License Manager

Turn your WordPress site into a software license manager for WordPress plugins, themes, and other downloadable products.

Mtx License Box vs WP License Manager