For complete licensing information, visit: https://fullcalendar.io/license
FullCalendar Premium is tri-licensed, meaning you must choose one of three licenses to use. Here is a summary of those licenses:
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Commercial License (a paid license, intended for commercial use) https://fullcalendar.io/commercial-license
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Creative Commons Non-Commercial No-Derivatives (intended for trial and non-commercial use) https://creativecommons.org/licenses/by-nc-nd/4.0/
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GPLv3 License (intended for open-source projects) http://www.gnu.org/licenses/gpl-3.0.en.html