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CVAL is granted and used by Developers during development phase and it's not required to integrate the license key string into applications developed (= project result).
License is required when developing project(s) that uses Vaadin Calendar Add-on software.
Once the Project is completed the licensee may license, for free or against a payment, Project Result including Licensed Software whether regarded as derivative works or not. End users using Project Result that does not involve changing any source code are not required to have a valid License.
For detailed information you can read through section 2. Grant of License from CVAL 2.0