That plugin is licensed under the GPL (GNU General Public License), so you can modify it as you please. You can even redistribute your modified version, as long as you do so under the GPL and adhere to its requirements.
That said, even if it wasn’t, I believe you would be allowed to add CSS, since you are not even modifying the plugin in any way. I personally would look for a way to actually remove that link from the output, though, not just via CSS.
Related Posts:
- Open Source plugin and requires licence
- GPL and plugins
- Create plugin with 3rd party MIT license code
- Does releasing a plugin under the AGPL force people to open source their whole WordPress installation?
- Licensing: Can I include SWFs without source in a plugin released on wordpress.org?
- Licensing of freemium plugin
- Is license need for free wordpress plugin
- Best way to maintain and update 3rd-party WP plugin when developer is unresponsive?
- Can I put in Github the code of a abandoned plugin I want to fork?
- Can I use Symfony components in a plugin that I want to submit to the WordPress plugin repository?
- Custom license for WordPress plugin
- Is it fair to use MIT licensed code in WordPress plugins? [closed]
- Licensing options for WordPress Plugins
- Licensing a Plugin [closed]
- Single Domain/Multiple Domain installation restrictions allowed for plugins?
- How come W3TC is allowed to host premium code in the WordPress repo?
- best way to handle subscriptions with a licence?
- RSS icons have the same Alt tag. Lighthouse is failing these elements. How do I display different alt tags for each icon?
- Modify plugin and submit to directory
- From a legal perspective, is it okay to customize a plugin’s code?
- Make a plugin work on specified domain only
- How to Replicate Elementor Licensing Model
- WooCommerce – How to Add a Custom Field to Cart Items and Cart Totals [closed]
- Is there a way to use latex \cite{reference} in wordpress?
- How to check plugin compatibility before upgrading WordPress
- How do I unlock a post programmatically?
- Force Plugin to English Translation
- How to parse nested shortcodes?
- Custom wp_nav_menu output (displaying all child elements of top menu element in current branch)
- Removing user contact methods works from functions.php but not from a plugin
- How to extract images of post and pages excluding header and logo image in wordpress?
- Subscribe2 Configuration
- I need to Remove this line
- Dropzone.js and wordpress plugin
- Filter or action hook to insert content on admin pages before tag
- How do I change the default WordPress e-mail ID for sent e-mail?
- How to create a word press user with hashedpassword
- Is it possible to set up multistore in Woocommerce? [closed]
- Leveraging WordPress Comments on Custom Plugin Object page
- W3 Total Cache: Load CSS asynchronously for better PageSpeed score? [closed]
- Show HTML form before WordPress plugin deletion
- Menus, but not by theme location
- Email Bounce Address
- Will Gutenberg Have a Negative Impact on Page Speed?
- import posts with dutch/special letters
- Installing Jplayer in WordPress
- Does plugin’s uninstall.php file have access to the plugin ‘s object?
- Related posts widget or plugin needed
- Use $_GET inside a shortcode print empty Array
- Implementing an “Email this” button?
- Use conditional logic for woocommerce variable product
- How to customize a title by passing query string?
- Remove Advanced Custom Fields plugin for client?
- How to check if an email was sent from or originated from a specific plugin?
- Gutenberg Blocks – Cannot retrieve block saved attributes in edit post
- How to add fields in the WordPress editor?
- Migrating WordPress – New domain entry, links broken
- Search Results Page filter by page title
- Get param from shortcode in plugin function
- change or add css to theme from plugin
- Update-safe translating of single text string in plugin
- At a Loss on over Page Peel Plugin Customization [closed]
- jQuery(‘#news-ticker’).cycle is not a function
- How to display an alert when deleting a plugin?
- Effeciently adding Checkboxes to TablePress table cells
- WordPress Phone Field Check (use numbers, spaces and pluses)
- Import a folder containing HTML files and images to WordPress
- Can i stream data to a custom_post_type?
- Is there a hook similar to “save_post” which only fires AFTER the post is completely published?
- How to remove Unused CSS From a WordPress Theme?
- How to delete Crisp Chat plugin completely?
- Using Shortcode Result In Custom HTML Block (Using Google Sheet JQuery Result As NumScroller data-max)
- How To Export User’s Custom Fields in CSV or XLSX
- Some resources of my website are pointing to www.mysite.com/dev/ and trying to get rid of that append has been a headache
- Display plugin-generated content to override a placeholder page
- Is it possible to disable a theme programmatically?
- Members-only page, but accessible via sharable link
- Google trying to index child theme files
- The dropdown list in autocomplete is not showing
- How to overlay a webcomic plugin on top of a header image?
- Consume legacy rest api dependent upon WP API plugin
- Edit the stylesheet of a child theme
- Disqus comments count taking long to update
- Escaping and sanitization
- How to save default values into an option and delete those upon actvation and deactivation in wordpress?
- How to Add Jquery FullCalendar in wp plugin in admin
- How to speed up installing plugins and upgrading WordPress
- Ajax, jQuery and WordPress
- Advanced Custom Field User Help URL
- No plugin updates after moving wp-config.php above root map
- WordPress check box unchecked on null value ternary operator [plugin development]
- Want to show pop up image on home page every time when i refresh it [closed]
- woocommerce show cities state as dropdown list
- WordPress portfolio pagination on home page
- Wrapping code in an if block
- Is it possible to control content on different pages by checkboxing wich content is shown where on a wordpress theme page?
- Make plugin admin page visible to other roles
- How Create LastMod and Update Date Only on Taxonomy Category and Tags
- How To Convert External Image URLs To Own Website’s Uploaded Images Automatically?
- Getting 400 Error in wordpress website