Licensed feature demo

This compiled C++ plugin is built with the exported SDK and no Qt or private application headers. Its ET panel has a free action, an entitlement-gated paid action, and an Activate action that opens the host plugin manager. The paid action asks ET_SERVICE_LICENSE asynchronously for org.epictuner.feature.pro; the host checks signed entitlement status at dispatch. The sample is intentionally transparent and is not DRM.

Build with a native 64-bit compiler:

cmake -S examples/licensed-feature-demo -B out -DCMAKE_PREFIX_PATH=/path/to/EpicTunerSDK
cmake --build out --config Release

For a signed test package, edit out/package-manifest.json with your test publisher/key IDs. Place the resulting library at payload/<platform>/licensed-feature-demo.<dll-or-so>, then run:

python tools/package.py --manifest out/package-manifest.json --payload-root payload \
  --key /outside/sdk/test-publisher.pem --output licensed-feature.etplugin

tools/package.py requires Python cryptography and jsonschema in the publisher environment. Private keys stay outside the SDK and package. Import the corresponding publisher public-key JSON in Plugins → Trust publisher key, then install the package. For license testing, import an issuer public key separately and either use the manager's online activation URL or export a challenge, sign it with tools/test-issuer.py, and import its response. The test issuer accepts an external Ed25519 PEM and is not a production service.

The native acceptance run captured the panel after a signed install and both online and offline mock activation. It checks that the paid button is denied before activation and accepted after it. See docs/LICENSE.md and docs/PACKAGE.md for the wire and trust rules.