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To remove the licence key warning…….

For : Worpress SEO

In the following file:

/wp-content/plugins/wordpress-seo/vendor/yoast/license-manager/class-license-manager.php

delete lines 122 to 124

Which is this bit….

<div class=”error”>
<p><?php printf( __( $message, $this->product->get_text_domain() ), $this->product->get_item_name(), $this->product->get_license_page_url(), $this->product->get_tracking_url( ‘activate-license-notice’ ) ); ?></p>
</div>

For : Wordress SEO Premium

In the following file:

/wp-content/plugins/wordpress-seo-premium/vendor/yoast/license-manager/class-license-manager.php

delete lines 122 to 124

Which is this bit….

<div class=”error”>
<p><?php printf( __( $message, $this->product->get_text_domain() ), $this->product->get_item_name(), $this->product->get_license_page_url(), $this->product->get_tracking_url( ‘activate-license-notice’ ) ); ?></p>
</div>
If you want to permanently remove the Yoast SEO warning for all Yoast extensions, as well as have it update-safe, you can add this to your theme’s functions.php file or any other place that loads before the ‘admin_init’ action:

add_action('admin_init', function() {
global $wp_filter, $yoast_woo_seo;

if (!empty($wp_filter['admin_notices'][10])) {
foreach ($wp_filter['admin_notices'][10] as $hook_key => $hook) {
if (is_array($hook['function']) && $hook['function'][0] instanceof \Yoast_Plugin_License_Manager && $hook['function'][1] == 'display_admin_notices') {
unset($wp_filter['admin_notices'][10][$hook_key]);
}
}
}
});
Note that certain parts of this code are PHP 5.3+ only. For PHP 5.2 you will need to adjust the code accordingly.