Derrick Tennant

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). 
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.
To style the attributions, I’ve added these CSS classes:
<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>
Feel free to contact me, emrikol@gmail.com, if you have any problems or questions.

Attributron 2000

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

Based on the amazing Job by <a title="Nathan's Homepage" href="http://yergler.net/" rel="nofollow ugc">Nathan R. Yergler</a> and his <a href="http://wiki.creativecommons.org/WpLicense" rel="nofollow ugc">WP-Licencse Plugin</a>. This plugin Alows users to assign a Creative Commons license to content on a per post basis (or no license at all)
This plugin was made possible thanks to <a href="http://www.socialbrite.org" rel="nofollow ugc">SocialBrite</a>
The license chunk on the posts is wrapped in a DIV with class: wp_license

WP License reloaded

Per post Creative Commons Licensing (Ideal for multiple authours / licenses blogs)

Attributron 2000 vs WP License reloaded