Syncfusion Essential XlsIO Licensing

Developer License: One software license is required per developer.
Run-time royalty free. Note: The re-distribution of Syncfusion libraries as part your software application is run-time royalty free (i.e. Without a royalty payable to Syncfusion) provided that you have a current maintenance and support subscription for the Syncfusion product.

Customer may make multiple copies of the Licensed Product, so long as Customer includes all Syncfusion proprietary rights notices on such copies. However, such multiple copies are for the exclusive use of a single developer and are only allowed for the convenience of such developer to work on more than one computer system non-simultaneously.

Annual Subscription Renewal: For subscriptions soon to expire or up to 30 days past expiration.

Reinstatement of lapsed subscription: For subscriptions lapsed longer than 30 days up to one year.

Technical Support - Each Syncfusion license includes a one-year subscription for unlimited technical support and updates.  Support for Syncfusion products is available 24 / 5 through a custom-built support system, with responses guaranteed within a single business day. Support is also available by e-mail and phone. Syncfusion’s Direct-Trac system can be used to create support incidents and track them to completion 24 hours a day, 7 days a week and allows Syncfusion licensees to maintain a complete overview of their support history.