Derrick Tennant

<p>This plugin adds attribution inputs to the media uploader and “edit media” page. It includes a number of creative common license, public domain, fair use, and standard copyright. It will link back to the author’s page at either the end of a post/page and/or the attachment page. If you have a Flickr API key, it can automatically pull information for Flickr images (copyright, author name, title, description, etc).<br />
It adds a few settings to the Media settings page.  You can add a Flickr API key, or display Creative Common logos for their respective licenses.</p>
<p>To style the attributions, I’ve added these CSS classes:</p>
<ul>
<li>a2k-container – A div that contains all of the other elements</li>
<li>a2k-sources – Contains the text “Source:” or “Sources:” depending on the context</li>
<li>a2k-title – The attachment title</li>
<li>a2k-copyright – The copyright information.  It may or may not contain an img tag, depending on your settings</li>
<li>a2k-author – The author information.  If an author link is provded, it will contain an a tag.</li>
</ul>
<p>Feel free to contact me, emrikol@gmail.com, if you have any problems or questions.</p>


Attributron 2000

Easily add attribution to attachments and have them displayed on your posts.

david wolfpaw

<p>This plugin allows you to add a button to your site’s posts which will display terms and licensing for Creative Commons reposting, as well as the title and content of the post for easy sharing. This is useful for sites that want to easily and clearly share their content with others.</p>
<h3>Usage</h3>
<ol>
<li>Install and activate the plugin.</li>
<li>Navigate to the Creative Commons settings page under Settings in the WordPress dashboard.</li>
<li>Edit the terms text andv select the license type that you want to use as a default.</li>
<li>On individual posts, you can select a different license type to use, or set that particular post to not Creative Commons licensed.</li>
</ol>


Creative Commons Post Republisher

I spent an entire afternoon trying different CC plugins, and this one was the ONLY one that did what I wanted. It has a meta box on every post that lets you choose the license for that page. Magic. 

Best I've found so far

This plugin allows you to add a button to your site's posts which will display terms and licensing for Creative Commons reposting, as well as the …

Attributron 2000 vs Creative Commons Post Republisher