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If not licensed, TWPdfViewer will be fully functional but it will show Demo watermark.
License is valid for 1 year free upgrades and official support.
After that, TWPdfViewer will work for all the versions of the component which were available at the time of licensing.
It is possible to buy additional license upgrade.

How to apply license?

For your project, it is enough that you call this code just once, but before TWPdfViewer component is used.
If you don't apply a correct license, demo watermark will be shown.

using Terminalworks.PdfViewer.AspNetCore;

var licensing = new Licensing(companyName, licenseKey);          
if (!Licensing.IsLicensed) {
    var error = Licensing.LicenseStatus; // information why it isn't valid
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