Easily add attribution to attachments and have them displayed on your posts.
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:
Feel free to contact me, firstname.lastname@example.org, if you have any problems or questions.