WP Remove Category Base

Installation Instructions

1. Upload the wp-remove-category-base folder to the /wp-content/plugins/ directory
2. Activate the plugin through the ‘Plugins’ menu in WordPress
3. No need to configure, it just works!

Is this really the same functionality as the deprecated functionality from the WordPress SEO plugin by Yoast?

Yes. With a few small improvements.

Is it legal to copy and use Joost’s code like that?

Yes.