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.

Kevin Batdorf

BjornW

Tarmo Toikkanen

Ahmad Bilal

hugosolar

possumbilities

Timid Robot

robmyers

The Creative Commons WordPress plugin gives authors the ability to license content with a Creative Commons license (<a href="https://creativecommons.org/choose/" rel="nofollow ugc">Choose a License</a>). With this plugin you can:
<ul>
<li>License your blog (single WordPress install)</li>
<li>Display license for the site, posts and pages</li>
<li>Prevent license changes per site (all pages on a site must use the same license)</li>
<li>License your WordPress Network (WordPress Multisite install)</li>
<li>License some of your sites differently in your WordPress Network</li>
<li>Prevent license changes in your WordPress Network (all pages on all sites need to use the same license)</li>
<li>License all your content with the same license (license per author)</li>
<li>License some posts, pages, or images differently from your default license (per content license)</li>
<li>License posts and pages by simply including CC Gutenberg blocks for each license required (Gutenberg License Blocks)</li>
<li>Display license information with “One Click Attribution” for images</li>
</ul>
The default license for the site used by the plugin is the Creative Commons <a href="http://creativecommons.org/licenses/by-sa/4.0/" rel="nofollow ugc">Attribution-ShareAlike (CC BY-SA)</a> license. This can be easily changed including attribution, depending on the permissions by a user with the role: superadmin, site admin or author.Selecting a license is straight forward. If you are not sure about what license to use, you can use the linked license chooser.
The selected license can be displayed as a widget or a footer or both at the same time. In Appearance > Widgets, the CC License widget can be dragged to any widget area like the side-bar and all other available areas. You can also include the license in footer. We recommend using the widget for better compatibility with your theme. You can use individual licenses in posts or pages using Gutenberg blocks.

Creative Commons

Official Creative Commons plugin for licensing your content. With Creative Commons licenses, keep your copyright AND share your creativity.

Attributron 2000 vs Creative Commons