Easy Social Share Buttons for WordPress plugin is fully functional even without being activated with the license key. The activation using the license key will unlock:

• Automatic plugin updates directly inside your WordPress dashboard (no need to wait – get instant updates);
• Access to free plugin extensions. You won’t be able to download and activate the free plugin extensions from the library;
•  Access to Styles’ library. You won’t be able to use the ready-made designs or the styles’ library features;
•  Access to multilingual translate menu for integration with WPML and Polylang;
•  Access to custom networks, positions, or design-builders;
•  Remove usage message visible inside the code only;

To activate the plugin you need to visit the About -> Activate menu.