Hi John,
You need
to have a Syncfusion Flutter license to use our Flutter calendar in your
applications. But there is no need to add the license key anywhere in your
project.
The Flutter controls from Syncfusion can
be used without registering the license keys. So,
you may publish your app on Google Play without registering a license key.
You can
refer to the Syncfusion licensing terms and conditions from the below links.
https://github.com/syncfusion/flutter-examples/blob/master/LICENSE
https://help.syncfusion.com/flutter/licensing/overview
And you can get more details about our community license
from the below link.
https://www.syncfusion.com/products/communitylicense
Please
let us know if you have any concerns.
Regards,
Jeyaseelan M