Licensing

This page is the runtime reference for how a license shapes Doconut's behavior: what each license state allows, how capabilities are granted, and how to inspect all of it from code. (For loading a license, see Getting Started → License Setup.)

License states and what they do

Two consequences worth internalizing:

• A missing license is not a temporary license. With no license file, pages render watermarked and no capability (search, annotation, plugins) is active. The full-featured, unwatermarked experience requires an actual Temporary license (get one).
• Only a rejected license blocks opening. Calendar/subscription expiry degrades to watermarked rendering; but deploying a build newer than the license's version window is rejected and fails fast with a LicenseException, so you catch it at deploy — not by silently shipping watermarked output. That exception (from OpenDocumentAsync) carries the reason from License.RejectionMessage.

Capabilities

Doconut gates optional functionality by capability. Today those are the opt-in Converter and DICOM plugins plus the built-in Search and Annotation features, each granted by your license. The base viewer is not a capability — it is the prerequisite, surfaced as IsViewerLicensed:

bool viewerLicensed = lic.IsViewerLicensed; // non-TRIAL license present AND covering this build's version

The single gate the whole pipeline uses is IsCapabilityGranted:

bool searchGranted = lic.IsCapabilityGranted(LicenseCapability.Search);

Its logic, verbatim from the implementation: an active (non-expired) Temporary license grants every capability — including capabilities that don't have a dedicated purchase flag yet; a real purchased license grants exactly its Has* flags and is default-deny for anything unmapped. (A legacy TRIAL-type file is not an entitlement — it is treated as unlicensed: watermarked, nothing granted.)

Temporary licenses

Temporary (Developer/NFR) licenses are marked by an ExpiryNote tag and carry a hard expiry date:

Expiry semantics differ by tier: a temporary license expires on its LicenseExpiry date only (its subscription window is ignored; a temporary license missing the date is treated as expired, fail-safe). Every other license expires on its subscription/update-window date.

IDoconutLicenseService reference

Inject IDoconutLicenseService (namespace Doconut.Core.Interfaces; registered as a singleton — the license is parsed once at startup):

DoconutLicenseInfo exposes the display-friendly snapshot for admin panels: Owner, Email, LicenseType, Domain, IsLicenseFileFound, IsVersionValid, IsTrial, IsExpired, the Has* flags, the temporary-license fields, and RejectionMessage.

// Feature-flag your UI from the same source of truth the SDK uses
app.MapGet("/api/features", (IDoconutLicenseService lic) => Results.Ok(new
{
    viewer     = lic.IsViewerLicensed || lic.IsTemporary,
    search     = lic.IsCapabilityGranted(LicenseCapability.Search),
    annotation = lic.IsCapabilityGranted(LicenseCapability.Annotation),
    conversion = lic.HasConverter,
    dicom      = lic.HasDicom,
}));

Health check

AddDoconut() registers a "doconut" health check that reports license/expiry state through the standard ASP.NET Core mechanism:

app.MapHealthChecks("/health");

Wire it into your monitoring and an expiring subscription becomes an alert instead of a support ticket.

Version upgrades

A license covers a version window. Updating the NuGet package to a build newer than that window makes the license invalid for this build: IsVersionValid turns false and opening is blocked with a LicenseException (the reason is in License.RejectionMessage) — deliberately fail-fast, so a stale or unlicensed build is caught at deploy rather than silently watermarking production output. Renew the subscription, replace the .lic, and restart the application so AddDoconut() loads the new license.