P. Chandra

Adds copyright notice at end of articles in full text RSS feeds, with back links to the blog and original article.
A notice gets attached at the bottom of feed articles like this 
Original Article: Title of Article (linked to permalink) 
Copyright Year. Blog Title (linked). All Rights Reserved
Your Blog title is linked to your blog Url. Your article title is linked to the article permalink.
Blog copyright notices are important as your feed gets freely distributed across the web and is republished without permission by RSS scrappers and autoblogs. After using this plugin, now RSS scrappers will link back to your site, which will suggest to search engines that your blog and article was the original source.

Simple Feed Copyright

Adds copyright notice at end of articles in full text RSS feeds, with back links to the blog and original article.

plaintxt.org

Extended Options manages certain meta data and content add-ins from within the WordPress dashboard. This plugin adds the capacity for meta data and content added to the footer and <code>head</code> areas to be kept consistent regardless of a theme change or upgrade.
Extended Options is for WordPress 2.6.x and, more specifically, manages following meta links and tweaks:
<ul>
<li>Archive meta links</li>
<li>Relationship meta links</li>
<li>Favicon meta links (blog and dashboard)</li>
<li>OpenID meta links</li>
<li>MicroID meta links</li>
<li>Geo tag meta links</li>
<li>Robots meta links</li>
<li>Enabling/disabling author archives</li>
<li>Enabling/disabling 404 headers</li>
<li>Enforcing <code>www.</code> preference</li>
<li>Protocol discovery meta links (Atom, RSD, WLW)</li>
<li>Enabling/disabled generator meta link</li>
<li>General meta add-in content</li>
<li>General comment form add-in content</li>
<li>General footer add-in content</li>
</ul>
While this collection of meta data and tweaks appear random, these are specific modifications I grew tired of making whenever I activated a different theme or upgraded an old one. I needed a plugin to manage these needs that didn’t overlap significantly with other plugins I used.
Special thanks to some awesome code integrated (and possibly modified) with Extended Options.
<ul>
<li><a href="http://alexking.org/blog/2008/03/30/comment-license-12" title="Comment License 1.2" rel="nofollow ugc">Comment License</a> by Alex King</li>
<li><a href="https://wordpress.org/extend/plugins/enforce-www-preference/" title="Enforce www preference plugin" rel="ugc">Enforce www Preference</a> by Mark Jaquith</li>
</ul>
Thanks to those fellows for providing excellent plugins to the community.
<h3>Use</h3>
Access the Extended Options menu from Dashboard > Settings > Extended to set the plugin options. To use this plugin, you do not need to edit any theme files or WordPress core files.
Everything this plugin does happens based on settings in the Extended menu. Extended Options does require, however, the following hooks/actions to be present in the certain files of your active theme.
<ul>
<li><code>wp_head()</code> should be present in your <code>header.php</code> theme file.</li>
<li><code>wp_footer()</code> should be present in your <code>footer.php</code> theme file.</li>
<li><code>do_action( 'comment_form', $post->ID )</code> should be present in your <code>comments.php</code> theme file.</li>
</ul>
If your theme files are missing these, please contact the theme author and ask him or her nicely to correct these omissions.
<h3>License</h3>
Extended Options, a plugin for WordPress, (C) 2008 by Scott Allan Wallick, is licensed under the <a href="http://www.gnu.org/licenses/gpl.html" title="GNU General Public License" rel="nofollow ugc">GNU General Public License</a>.
Extended Options is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Extended Options is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Extended Options. If not, see <a href="http://www.gnu.org/licenses/" title="GNU General Public Licenses" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Extended Options

Extended Options keeps meta data and certain WordPress tweaks persistent regardless of the active theme without editing any theme files.

Simple Feed Copyright vs Extended Options