The client SDK: native code, industry-standard cryptography

#include "softactivate/sws_licensing.h"

// create a licensing client instance
auto client = sws::licensing::client::create(endpoint_url);

client->set_metadata("trusted_domain", trusted_domain);
client->set_vendor_id(VENDOR_ID);
client->set_license_key(CUSTOMER_LICENSE_KEY);

// validate: activates online the first time, then validates the
// locally-stored, cryptographically-signed license offline
auto params = client->create_license_validation_params();
auto result = client->validate_license(params);

if (!result->is_license_valid())
{
    // the status tells you WHY: expired, revoked, bound to another
    // machine, subscription payment required...
    handle_invalid(result->get_status());
}

// persist the (possibly updated) license for offline validation
if (auto updated = result->get_updated_license())
    save_license(updated);