Finecam Registration Code -

// b) Basic structural validation (e.g., groups of 4 chars) if (!IsCorrectStructure(cleaned)) return RegistrationResult.InvalidFormat;

// Trim, upper‑case, remove whitespace/hyphens as needed // Return null if characters outside allowed set are found

// Windows: DPAPI ProtectData (CurrentUser) // macOS: Keychain // Linux: libsecret or encrypted file with file‑system ACLs finecam registration code

// 1) Decode base64 segment that contains the digital signature // 2) Use the embedded public key (RSA 2048 or ECDSA P‑256) to verify // 3) Constant‑time comparison to avoid timing attacks

return RegistrationResult.Success;

// 1. Public API -------------------------------------------------------------- public RegistrationResult Register(string userInput)

private LicensePayload DecodeLicense(string key) // b) Basic structural validation (e

// e) Check expiration / feature flags if (payload.IsExpired) return RegistrationResult.Expired; if (!IsFeatureAllowed(payload)) return RegistrationResult.NotAuthorized;