license-keys

Adds license keys to a paid desktop app, CLI, plugin or self-hosted product. Covers key generation, hashed storage, device activation with an activation limit, same-device reinstall, deactivation to move devices, revocation on refund or chargeback, expiry, and signed offline leases. Ships a runnable zero-dependency server and client with tests, and explains when to use Creem's built-in license keys (proxied through your backend) instead. Use when the user asks for license keys, activation codes, serial numbers, "limit to N devices", offline licensing, or revoking a refunded customer's key.