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.

Ataur R

The “Disable RSS, RDF, and Atom Feeds” plugin allows you to disable all RSS, RDF, and Atom feeds easily on your WordPress website. This plugin provides options to redirect feed requests to the corresponding HTML content or issue a 404 error. You can also allow the global post and comment feeds if desired.
This plugin is handy if you do not use RSS feeds and want to reduce your site’s exposure. It prevents unauthorized users from accessing your site’s content via feeds.
<h3>USEFUL LINK</h3>
<a href="http://wpmet.com/support-help/" rel="nofollow ugc">Get a Quick Support</a>
<h3>Features</h3>
✔️ Disable all feeds: RSS, RDF, and Atom.
✔️ Options to redirect feed requests or issue a 404 error.
✔️ Allow global post feed and comment feed.
✔️ Integration with bbPress to disable forum/topic/reply feeds.
✔️ Simple configuration through WordPress settings.

Disable RSS, RDF, and Atom Feeds

Disable all RSS, RDF, and Atom feeds on your WordPress site with the option to control behavior such as redirection or issuing a 404 error.

Simple Feed Copyright vs Disable RSS, RDF, and Atom Feeds