diff --git a/ChangeLog b/ChangeLog
index a0978ce24..b338a33bf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,7 @@ Enhancements:
 - #6750 Integrate SonarCloud for static analysis and test coverage
 - #6792 License key expiry
 - #6799 Synergy "Business" edition
+- #6800 Update behaviour when unregistered
 
 v1.12.0-stable
 ===========
diff --git a/src/gui/src/ActivationDialog.cpp b/src/gui/src/ActivationDialog.cpp
index 9033ad709..0569449e1 100644
--- a/src/gui/src/ActivationDialog.cpp
+++ b/src/gui/src/ActivationDialog.cpp
@@ -30,10 +30,10 @@ ActivationDialog::ActivationDialog(QWidget* parent, AppConfig& appConfig,
 
 void ActivationDialog::refreshSerialKey()
 {
-	ui->m_pTextEditSerialKey->setText(m_appConfig->serialKey());
-	ui->m_pTextEditSerialKey->setFocus();
-	ui->m_pTextEditSerialKey->moveCursor(QTextCursor::End);
-	ui->m_trialLabel->setText(tr(m_LicenseManager->getLicenseNotice().toStdString().c_str()));
+    ui->m_pTextEditSerialKey->setText(m_appConfig->serialKey());
+    ui->m_pTextEditSerialKey->setFocus();
+    ui->m_pTextEditSerialKey->moveCursor(QTextCursor::End);
+    ui->m_trialLabel->setText(tr(m_LicenseManager->getLicenseNotice().toStdString().c_str()));
 }
 
 ActivationDialog::~ActivationDialog()
@@ -47,7 +47,6 @@ void ActivationDialog::reject()
         CancelActivationDialog cancelActivationDialog(this);
         if (QDialog::Accepted == cancelActivationDialog.exec()) {
             m_LicenseManager->skipActivation();
-            m_appConfig->activationHasRun(true);
         } else {
             return;
         }
diff --git a/src/gui/src/LicenseManager.cpp b/src/gui/src/LicenseManager.cpp
index 1447b91bf..ee52f9a3a 100644
--- a/src/gui/src/LicenseManager.cpp
+++ b/src/gui/src/LicenseManager.cpp
@@ -23,208 +23,208 @@
 #include <QThread>
 
 LicenseManager::LicenseManager(AppConfig* appConfig) :
-	m_AppConfig(appConfig),
-	m_serialKey(appConfig->edition()) {
+    m_AppConfig(appConfig),
+    m_serialKey(appConfig->edition()) {
 }
 
 std::pair<bool, QString>
 LicenseManager::setSerialKey(SerialKey serialKey, bool acceptExpired)
 {
-	std::pair<bool, QString> ret (true, "");
-	time_t currentTime = ::time(0);
+    std::pair<bool, QString> ret (true, "");
+    time_t currentTime = ::time(0);
 
-	if (!acceptExpired && serialKey.isExpired(currentTime)) {
-		ret.first = false;
-		ret.second = "Serial key expired";
-		return ret;
-	}
+    if (!acceptExpired && serialKey.isExpired(currentTime)) {
+        ret.first = false;
+        ret.second = "Serial key expired";
+        return ret;
+    }
 
-	if (serialKey != m_serialKey) {
-		using std::swap;
-		swap (serialKey, m_serialKey);
-		m_AppConfig->setSerialKey(QString::fromStdString
-									(m_serialKey.toString()));
-		emit serialKeyChanged(m_serialKey);
+    if (serialKey != m_serialKey) {
+        using std::swap;
+        swap (serialKey, m_serialKey);
+        m_AppConfig->setSerialKey(QString::fromStdString
+                                  (m_serialKey.toString()));
+        emit serialKeyChanged(m_serialKey);
 
-		emit showLicenseNotice(getLicenseNotice());
-		if (m_serialKey.isExpired(currentTime)) {
-			emit LicenseExpired();
-		}
+        emit showLicenseNotice(getLicenseNotice());
+        if (!m_serialKey.isValid()) {
+            emit InvalidLicense();
+        }
 
-		if (m_serialKey.edition() != serialKey.edition()) {
-			m_AppConfig->setEdition(m_serialKey.edition());
-			emit editionChanged(m_serialKey.edition());
-		}
-	}
+        if (m_serialKey.edition() != serialKey.edition()) {
+            m_AppConfig->setEdition(m_serialKey.edition());
+            emit editionChanged(m_serialKey.edition());
+        }
+    }
 
-	return ret;
+    return ret;
 }
 
 void
 LicenseManager::notifyUpdate(QString fromVersion, QString toVersion) const {
-	if ((fromVersion == "Unknown")
-		&& (m_serialKey == SerialKey(kUnregistered))) {
-		return;
-	}
+    if ((fromVersion == "Unknown")
+            && (m_serialKey == SerialKey(kUnregistered))) {
+        return;
+    }
 
-	ActivationNotifier* notifier = new ActivationNotifier();
-	notifier->setUpdateInfo (fromVersion, toVersion,
-							QString::fromStdString(m_serialKey.toString()));
+    ActivationNotifier* notifier = new ActivationNotifier();
+    notifier->setUpdateInfo (fromVersion, toVersion,
+                             QString::fromStdString(m_serialKey.toString()));
 
-	QThread* thread = new QThread();
-	connect(notifier, SIGNAL(finished()), thread, SLOT(quit()));
-	connect(notifier, SIGNAL(finished()), notifier, SLOT(deleteLater()));
-	connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
+    QThread* thread = new QThread();
+    connect(notifier, SIGNAL(finished()), thread, SLOT(quit()));
+    connect(notifier, SIGNAL(finished()), notifier, SLOT(deleteLater()));
+    connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
 
-	notifier->moveToThread(thread);
-	thread->start();
+    notifier->moveToThread(thread);
+    thread->start();
 
-	QMetaObject::invokeMethod(notifier, "notifyUpdate",
-							  Qt::QueuedConnection);
+    QMetaObject::invokeMethod(notifier, "notifyUpdate",
+                              Qt::QueuedConnection);
 }
 
 Edition
 LicenseManager::activeEdition() const
 {
-	return m_serialKey.edition();
+    return m_serialKey.edition();
 }
 
 QString
 LicenseManager::activeEditionName() const
 {
-	return getEditionName(activeEdition(), m_serialKey.isTrial());
+    return getEditionName(activeEdition(), m_serialKey.isTrial());
 }
 
 SerialKey
 LicenseManager::serialKey() const
 {
-	return m_serialKey;
+    return m_serialKey;
 }
 
 void
 LicenseManager::refresh()
 {
-	if (!m_AppConfig->serialKey().isEmpty()) {
-		try {
-			SerialKey serialKey (m_AppConfig->serialKey().toStdString());
-			setSerialKey(serialKey, true);
-		} catch (...) {
-			m_AppConfig->clearSerialKey();
-		}
-	}
-	if (m_serialKey.isExpired(::time(0))) {
-		emit LicenseExpired();
-	}
+    if (!m_AppConfig->serialKey().isEmpty()) {
+        try {
+            SerialKey serialKey (m_AppConfig->serialKey().toStdString());
+            setSerialKey(serialKey, true);
+        } catch (...) {
+            m_AppConfig->clearSerialKey();
+        }
+    }
+    if (!m_serialKey.isValid()) {
+        emit InvalidLicense();
+    }
 }
 
 void
 LicenseManager::skipActivation() const
 {
-	notifyActivation ("skip:unknown");
+    notifyActivation ("skip:unknown");
 }
 
 QString
 LicenseManager::getEditionName(Edition const edition, bool trial)
 {
-	SerialKeyEdition KeyEdition(edition);
-	std::string name = KeyEdition.getDisplayName();
+    SerialKeyEdition KeyEdition(edition);
+    std::string name = KeyEdition.getDisplayName();
 
-	if (trial) {
-		name += " (Trial)";
-	}
+    if (trial) {
+        name += " (Trial)";
+    }
 
-	return QString::fromUtf8 (name.c_str(), static_cast<int>(name.size()));
+    return QString::fromUtf8 (name.c_str(), static_cast<int>(name.size()));
 }
 
 void
 LicenseManager::notifyActivation(QString identity) const
 {
-	ActivationNotifier* notifier = new ActivationNotifier();
-	notifier->setIdentity(identity);
+    ActivationNotifier* notifier = new ActivationNotifier();
+    notifier->setIdentity(identity);
 
-	QThread* thread = new QThread();
-	connect(notifier, SIGNAL(finished()), thread, SLOT(quit()));
-	connect(notifier, SIGNAL(finished()), notifier, SLOT(deleteLater()));
-	connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
+    QThread* thread = new QThread();
+    connect(notifier, SIGNAL(finished()), thread, SLOT(quit()));
+    connect(notifier, SIGNAL(finished()), notifier, SLOT(deleteLater()));
+    connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
 
-	notifier->moveToThread(thread);
-	thread->start();
+    notifier->moveToThread(thread);
+    thread->start();
 
-	QMetaObject::invokeMethod(notifier, "notify", Qt::QueuedConnection);
+    QMetaObject::invokeMethod(notifier, "notify", Qt::QueuedConnection);
 }
 
 QString
 LicenseManager::getLicenseNotice() const
 {
-	QString Notice;
+    QString Notice;
 
-	if (m_serialKey.isTemporary()){
-		if (m_serialKey.isTrial()){
-			Notice = getTrialNotice();
-		}
-		else{
-			Notice = getTemporaryNotice();
-		}
-	}
+    if (m_serialKey.isTemporary()){
+        if (m_serialKey.isTrial()){
+            Notice = getTrialNotice();
+        }
+        else{
+            Notice = getTemporaryNotice();
+        }
+    }
 
-	return Notice;
+    return Notice;
 }
 
 QString
 LicenseManager::getTrialNotice() const
 {
-	QString Notice;
+    QString Notice;
 
-	if (m_serialKey.isExpired(::time(0))){
-		Notice = "<html><head/><body><p>Your %1 trial has expired. <a href="
-				"\"https://members.symless.com/purchase\">"
-				"<span style=\"text-decoration: underline;color:#0000ff;\">"
-				"Buy now!</span></a></p></body></html>";
-		Notice = Notice.arg(LicenseManager::getEditionName(activeEdition()));
-	}
-	else{
-		Notice = "<html><head/><body><p><span style=\""
-				"font-weight:600;\">%1</span> day%3 of "
-				"your %2 trial remain%5. <a href="
-				"\"https://members.symless.com/purchase\">"
-				"<span style=\"text-decoration: underline;"
-				" color:#0000ff;\">Buy now!</span></a>"
-				"</p></body></html>";
+    if (m_serialKey.isExpired(::time(0))){
+        Notice = "<html><head/><body><p>Your %1 trial has expired. <a href="
+                 "\"https://members.symless.com/purchase\">"
+                 "<span style=\"text-decoration: underline;color:#0000ff;\">"
+                 "Buy now!</span></a></p></body></html>";
+        Notice = Notice.arg(LicenseManager::getEditionName(activeEdition()));
+    }
+    else{
+        Notice = "<html><head/><body><p><span style=\""
+                 "font-weight:600;\">%1</span> day%3 of "
+                 "your %2 trial remain%5. <a href="
+                 "\"https://members.symless.com/purchase\">"
+                 "<span style=\"text-decoration: underline;"
+                 " color:#0000ff;\">Buy now!</span></a>"
+                 "</p></body></html>";
 
-		time_t daysLeft = m_serialKey.daysLeft(::time(0));
-		Notice = Notice
-				.arg (daysLeft)
-				.arg (LicenseManager::getEditionName(activeEdition()))
-				.arg ((daysLeft == 1) ? "" : "s")
-				.arg ((daysLeft == 1) ? "s" : "");
-	}
+        time_t daysLeft = m_serialKey.daysLeft(::time(0));
+        Notice = Notice
+                .arg (daysLeft)
+                .arg (LicenseManager::getEditionName(activeEdition()))
+                .arg ((daysLeft == 1) ? "" : "s")
+                .arg ((daysLeft == 1) ? "s" : "");
+    }
 
-	return Notice;
+    return Notice;
 }
 
 QString
 LicenseManager::getTemporaryNotice() const
 {
-	QString Notice;
+    QString Notice;
 
-	if (m_serialKey.isExpired(::time(0))) {
-		Notice = "<html><head/><body><p>Your license has expired. <a href="
-				"\"https://members.symless.com/purchase\">"
-				"<span style=\"text-decoration: underline;color:#0000ff;\">"
-				"Renew now!</span></a></p></body></html>";
-	}
-	else if (m_serialKey.isExpiring(::time(0))) {
-		Notice = "<html><head/><body><p><span style=\""
-				"font-weight:600;\">%1</span> day%2 "
-				"before your license expires.<a href="
-				"\"https://members.symless.com/purchase\">"
-				"<span style=\"text-decoration: underline;"
-				" color:#0000ff;\">Renew now!</span></a>"
-				"</p></body></html>";
+    if (m_serialKey.isExpired(::time(0))) {
+        Notice = "<html><head/><body><p>Your license has expired. <a href="
+                 "\"https://members.symless.com/purchase\">"
+                 "<span style=\"text-decoration: underline;color:#0000ff;\">"
+                 "Renew now!</span></a></p></body></html>";
+    }
+    else if (m_serialKey.isExpiring(::time(0))) {
+        Notice = "<html><head/><body><p><span style=\""
+                 "font-weight:600;\">%1</span> day%2 "
+                 "before your license expires.<a href="
+                 "\"https://members.symless.com/purchase\">"
+                 "<span style=\"text-decoration: underline;"
+                 " color:#0000ff;\">Renew now!</span></a>"
+                 "</p></body></html>";
 
-		time_t daysLeft = m_serialKey.daysLeft(::time(0));
-		Notice = Notice.arg (daysLeft).arg ((daysLeft == 1) ? "" : "s");
-	}
+        time_t daysLeft = m_serialKey.daysLeft(::time(0));
+        Notice = Notice.arg (daysLeft).arg ((daysLeft == 1) ? "" : "s");
+    }
 
-	return Notice;
+    return Notice;
 }
diff --git a/src/gui/src/LicenseManager.h b/src/gui/src/LicenseManager.h
index 823354939..d0401a5a3 100644
--- a/src/gui/src/LicenseManager.h
+++ b/src/gui/src/LicenseManager.h
@@ -37,10 +37,10 @@ public:
     Edition activeEdition() const;
     QString activeEditionName() const;
     SerialKey serialKey() const;
-	void skipActivation() const;
-	void notifyUpdate(QString fromVersion, QString toVersion) const;
-	static QString getEditionName(Edition edition, bool trial = false);
-	void notifyActivation(QString identity) const;
+    void skipActivation() const;
+    void notifyUpdate(QString fromVersion, QString toVersion) const;
+    static QString getEditionName(Edition edition, bool trial = false);
+    void notifyActivation(QString identity) const;
     QString getLicenseNotice() const;
 
 private:
@@ -50,7 +50,7 @@ private:
 signals:
     void serialKeyChanged (SerialKey) const;
     void editionChanged (Edition) const;
-    void LicenseExpired () const;
+    void InvalidLicense () const;
     void showLicenseNotice(const QString& notice) const;
 
 protected:
diff --git a/src/gui/src/MainWindow.cpp b/src/gui/src/MainWindow.cpp
index dee6eee77..0b4b3b531 100644
--- a/src/gui/src/MainWindow.cpp
+++ b/src/gui/src/MainWindow.cpp
@@ -174,8 +174,8 @@ MainWindow::MainWindow (AppConfig& appConfig,
     connect (m_LicenseManager, SIGNAL(showLicenseNotice(QString)),
              this, SLOT(showLicenseNotice(QString)), Qt::QueuedConnection);
 
-    connect (m_LicenseManager, SIGNAL(LicenseExpired()),
-             this, SLOT(LicenseExpired()), Qt::QueuedConnection);
+    connect (m_LicenseManager, SIGNAL(InvalidLicense()),
+             this, SLOT(InvalidLicense()), Qt::QueuedConnection);
 #endif
 
     connect (m_AppConfig, SIGNAL(sslToggled(bool)),
@@ -569,8 +569,8 @@ void MainWindow::checkSecureSocket(const QString& line)
     // obviously not very secure, since this can be tricked by injecting something
     // into the log. however, since we don't have IPC between core and GUI... patches welcome.
     const int index = line.indexOf(tlsCheckString, 0, Qt::CaseInsensitive);
-	  if (index > 0) {
-		    secureSocket(true);
+    if (index > 0) {
+        secureSocket(true);
 
         //Get the protocol version from the line
         m_SecureSocketVersion = line.mid(index + strlen(tlsCheckString));
@@ -613,8 +613,7 @@ void MainWindow::startSynergy()
 {
 #ifndef SYNERGY_ENTERPRISE
     SerialKey serialKey = m_LicenseManager->serialKey();
-    time_t currentTime = ::time(0);
-    if (serialKey.isExpired(currentTime)) {
+    if (!serialKey.isValid()) {
         if (QDialog::Rejected == raiseActivationDialog()) {
             return;
         }
@@ -1152,7 +1151,7 @@ void MainWindow::setEdition(Edition edition)
 }
 
 #ifndef SYNERGY_ENTERPRISE
-void MainWindow::LicenseExpired()
+void MainWindow::InvalidLicense()
 {
    stopSynergy();
    m_AppConfig->activationHasRun(false);
@@ -1379,12 +1378,10 @@ int MainWindow::raiseActivationDialog()
 void MainWindow::on_windowShown()
 {
 #ifndef SYNERGY_ENTERPRISE
-    time_t currentTime = ::time(0);
-    if (!m_AppConfig->activationHasRun()
-            && ((m_AppConfig->edition() == kUnregistered) ||
-                (m_LicenseManager->serialKey().isExpired(currentTime)))) {
-        raiseActivationDialog();
-    }
+	if (!m_AppConfig->activationHasRun() &&
+		!m_LicenseManager->serialKey().isValid()){
+			raiseActivationDialog();
+	}
 #endif
 }
 
diff --git a/src/gui/src/MainWindow.h b/src/gui/src/MainWindow.h
index 280ba22d4..c68dfb685 100644
--- a/src/gui/src/MainWindow.h
+++ b/src/gui/src/MainWindow.h
@@ -132,7 +132,7 @@ class MainWindow : public QMainWindow, public Ui::MainWindowBase
 public slots:
         void setEdition(Edition edition);
 #ifndef SYNERGY_ENTERPRISE
-        void LicenseExpired();
+		void InvalidLicense();
         void showLicenseNotice(const QString& message);
 #endif
         void appendLogRaw(const QString& text);
diff --git a/src/lib/shared/SerialKey.cpp b/src/lib/shared/SerialKey.cpp
index 08829ba01..1db94308e 100644
--- a/src/lib/shared/SerialKey.cpp
+++ b/src/lib/shared/SerialKey.cpp
@@ -31,75 +31,88 @@ using namespace std;
 static std::string hexEncode (std::string const& str);
 
 SerialKey::SerialKey(Edition edition):
-	m_userLimit(1),
-	m_warnTime(ULLONG_MAX),
-	m_expireTime(ULLONG_MAX),
-	m_edition(edition)
+    m_userLimit(1),
+    m_warnTime(ULLONG_MAX),
+    m_expireTime(ULLONG_MAX),
+    m_edition(edition)
 {
 }
 
 SerialKey::SerialKey(std::string serial) :
-	m_userLimit(1),
-	m_warnTime(0),
-	m_expireTime(0),
-	m_edition(kBasic)
+    m_userLimit(1),
+    m_warnTime(0),
+    m_expireTime(0),
+    m_edition(kBasic)
 {
-	string plainText = decode(serial);
-	bool valid = false;
-	if (!plainText.empty()) {
-		valid = parse(plainText);
-	}
-	if (!valid) {
-		throw std::runtime_error ("Invalid serial key");
-	}
+    string plainText = decode(serial);
+    bool valid = false;
+    if (!plainText.empty()) {
+        valid = parse(plainText);
+    }
+    if (!valid) {
+        throw std::runtime_error ("Invalid serial key");
+    }
 }
 
 bool
 SerialKey::isExpiring(time_t currentTime) const
 {
-	bool result = false;
+    bool result = false;
 
-	if (isTemporary()) {
-		unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
-		if ((m_warnTime <= currentTimeAsLL) && (currentTimeAsLL < m_expireTime)) {
-			result = true;
-		}
-	}
+    if (isTemporary()) {
+        unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+        if ((m_warnTime <= currentTimeAsLL) && (currentTimeAsLL < m_expireTime)) {
+            result = true;
+        }
+    }
 
-	return result;
+    return result;
 }
 
 bool
 SerialKey::isExpired(time_t currentTime) const
 {
-	bool result = false;
+    bool result = false;
 
-	if (isTemporary()) {
-		unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
-		if (m_expireTime <= currentTimeAsLL) {
-			result = true;
-		}
-	}
+    if (isTemporary()) {
+        unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+        if (m_expireTime <= currentTimeAsLL) {
+            result = true;
+        }
+    }
 
-	return result;
+    return result;
 }
 
 bool
 SerialKey::isTrial() const
 {
-	return m_KeyType.isTrial();
+    return m_KeyType.isTrial();
 }
 
 bool
 SerialKey::isTemporary() const
 {
-	return m_KeyType.isTemporary();
+    return m_KeyType.isTemporary();
+}
+
+bool
+SerialKey::isValid() const
+{
+    bool Valid = true;
+
+    if (m_edition.getType() == kUnregistered || isExpired(::time(0)))
+    {
+        Valid = false;
+    }
+
+    return Valid;
 }
 
 Edition
 SerialKey::edition() const
 {
-	return m_edition.getType();
+    return m_edition.getType();
 }
 
 static std::string
@@ -118,134 +131,134 @@ hexEncode (std::string const& str) {
 std::string
 SerialKey::toString() const
 {
-	std::ostringstream oss;
-	oss << "{";
-	if (isTemporary()) {
-		if (isTrial()){
-			oss << "v2;" << SerialKeyType::TRIAL << ";";
-		}
-		else{
-			oss << "v2;" << SerialKeyType::SUBSCRIPTION << ";";
-		}
-	} else {
-		oss << "v1;";
-	}
-	oss << m_edition.getName() << ";";
-	oss << m_name << ";";
-	oss << m_userLimit << ";";
-	oss << m_email << ";";
-	oss << m_company << ";";
-	oss << (isTemporary() ? m_warnTime : 0) << ";";
-	oss << (isTemporary() ? m_expireTime : 0);
-	oss << "}";
-	return hexEncode(oss.str());
+    std::ostringstream oss;
+    oss << "{";
+    if (isTemporary()) {
+        if (isTrial()){
+            oss << "v2;" << SerialKeyType::TRIAL << ";";
+        }
+        else{
+            oss << "v2;" << SerialKeyType::SUBSCRIPTION << ";";
+        }
+    } else {
+        oss << "v1;";
+    }
+    oss << m_edition.getName() << ";";
+    oss << m_name << ";";
+    oss << m_userLimit << ";";
+    oss << m_email << ";";
+    oss << m_company << ";";
+    oss << (isTemporary() ? m_warnTime : 0) << ";";
+    oss << (isTemporary() ? m_expireTime : 0);
+    oss << "}";
+    return hexEncode(oss.str());
 }
 
 time_t
 SerialKey::daysLeft(time_t currentTime) const
 {
-	unsigned long long timeLeft =  0;
-	unsigned long long const day = 60 * 60 * 24;
+    unsigned long long timeLeft =  0;
+    unsigned long long const day = 60 * 60 * 24;
 
-	unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
-	if (currentTimeAsLL < m_expireTime) {
-		timeLeft = m_expireTime - currentTimeAsLL;
-	}
+    unsigned long long currentTimeAsLL = static_cast<unsigned long long>(currentTime);
+    if (currentTimeAsLL < m_expireTime) {
+        timeLeft = m_expireTime - currentTimeAsLL;
+    }
 
-	unsigned long long daysLeft = 0;
-	daysLeft = timeLeft % day != 0 ? 1 : 0;
+    unsigned long long daysLeft = 0;
+    daysLeft = timeLeft % day != 0 ? 1 : 0;
 
-	return timeLeft / day + daysLeft;
+    return timeLeft / day + daysLeft;
 }
 
 std::string
 SerialKey::email() const
 {
-	return m_email;
+    return m_email;
 }
 
 std::string
 SerialKey::decode(const std::string& serial)
 {
-	static const char* const lut = "0123456789ABCDEF";
-	string output;
-	size_t len = serial.length();
-	if (len & 1) {
-		return output;
-	}
+    static const char* const lut = "0123456789ABCDEF";
+    string output;
+    size_t len = serial.length();
+    if (len & 1) {
+        return output;
+    }
 
-	output.reserve(len / 2);
-	for (size_t i = 0; i < len; i += 2) {
+    output.reserve(len / 2);
+    for (size_t i = 0; i < len; i += 2) {
 
-		char a = serial[i];
-		char b = serial[i + 1];
+        char a = serial[i];
+        char b = serial[i + 1];
 
-		const char* p = std::lower_bound(lut, lut + 16, a);
-		const char* q = std::lower_bound(lut, lut + 16, b);
+        const char* p = std::lower_bound(lut, lut + 16, a);
+        const char* q = std::lower_bound(lut, lut + 16, b);
 
-		if (*q != b || *p != a) {
-			return output;
-		}
+        if (*q != b || *p != a) {
+            return output;
+        }
 
-		output.push_back(static_cast<char>(((p - lut) << 4) | (q - lut)));
-	}
+        output.push_back(static_cast<char>(((p - lut) << 4) | (q - lut)));
+    }
 
-	return output;
+    return output;
 }
 
 bool
 SerialKey::parse(std::string plainSerial)
 {
-	string parityStart = plainSerial.substr(0, 1);
-	string parityEnd = plainSerial.substr(plainSerial.length() - 1, 1);
+    string parityStart = plainSerial.substr(0, 1);
+    string parityEnd = plainSerial.substr(plainSerial.length() - 1, 1);
 
-	bool valid = false;
+    bool valid = false;
 
-	// check for parity chars { and }, record parity result, then remove them.
-	if (parityStart == "{" && parityEnd == "}") {
-		plainSerial = plainSerial.substr(1, plainSerial.length() - 2);
+    // check for parity chars { and }, record parity result, then remove them.
+    if (parityStart == "{" && parityEnd == "}") {
+        plainSerial = plainSerial.substr(1, plainSerial.length() - 2);
 
-		// tokenize serialised subscription.
-		vector<string> parts;
-		std::string::size_type pos = 0;
-		bool look = true;
-		while (look) {
-			std::string::size_type start = pos;
-			pos = plainSerial.find(";", pos);
-			if (pos == string::npos) {
-				pos = plainSerial.length();
-				look = false;
-			}
-			parts.push_back(plainSerial.substr(start, pos - start));
-			pos += 1;
-		}
+        // tokenize serialised subscription.
+        vector<string> parts;
+        std::string::size_type pos = 0;
+        bool look = true;
+        while (look) {
+            std::string::size_type start = pos;
+            pos = plainSerial.find(";", pos);
+            if (pos == string::npos) {
+                pos = plainSerial.length();
+                look = false;
+            }
+            parts.push_back(plainSerial.substr(start, pos - start));
+            pos += 1;
+        }
 
-		if ((parts.size() == 8)
-				&& (parts.at(0).find("v1") != string::npos)) {
-			// e.g.: {v1;basic;Bob;1;email;company name;1398297600;1398384000}
-			m_edition.setType(parts.at(1));
-			m_name = parts.at(2);
-			sscanf(parts.at(3).c_str(), "%d", &m_userLimit);
-			m_email = parts.at(4);
-			m_company = parts.at(5);
-			sscanf(parts.at(6).c_str(), "%lld", &m_warnTime);
-			sscanf(parts.at(7).c_str(), "%lld", &m_expireTime);
-			valid = true;
-		}
-		else if ((parts.size() == 9)
-				 && (parts.at(0).find("v2") != string::npos)) {
-			// e.g.: {v2;trial;basic;Bob;1;email;company name;1398297600;1398384000}
-			m_KeyType.setKeyType(parts.at(1));
-			m_edition.setType(parts.at(2));
-			m_name = parts.at(3);
-			sscanf(parts.at(4).c_str(), "%d", &m_userLimit);
-			m_email = parts.at(5);
-			m_company = parts.at(6);
-			sscanf(parts.at(7).c_str(), "%lld", &m_warnTime);
-			sscanf(parts.at(8).c_str(), "%lld", &m_expireTime);
-			valid = true;
-		}
-	}
+        if ((parts.size() == 8)
+                && (parts.at(0).find("v1") != string::npos)) {
+            // e.g.: {v1;basic;Bob;1;email;company name;1398297600;1398384000}
+            m_edition.setType(parts.at(1));
+            m_name = parts.at(2);
+            sscanf(parts.at(3).c_str(), "%d", &m_userLimit);
+            m_email = parts.at(4);
+            m_company = parts.at(5);
+            sscanf(parts.at(6).c_str(), "%lld", &m_warnTime);
+            sscanf(parts.at(7).c_str(), "%lld", &m_expireTime);
+            valid = true;
+        }
+        else if ((parts.size() == 9)
+                 && (parts.at(0).find("v2") != string::npos)) {
+            // e.g.: {v2;trial;basic;Bob;1;email;company name;1398297600;1398384000}
+            m_KeyType.setKeyType(parts.at(1));
+            m_edition.setType(parts.at(2));
+            m_name = parts.at(3);
+            sscanf(parts.at(4).c_str(), "%d", &m_userLimit);
+            m_email = parts.at(5);
+            m_company = parts.at(6);
+            sscanf(parts.at(7).c_str(), "%lld", &m_warnTime);
+            sscanf(parts.at(8).c_str(), "%lld", &m_expireTime);
+            valid = true;
+        }
+    }
 
-	return valid;
+    return valid;
 }
diff --git a/src/lib/shared/SerialKey.h b/src/lib/shared/SerialKey.h
index abb16fca4..cfaf19da6 100644
--- a/src/lib/shared/SerialKey.h
+++ b/src/lib/shared/SerialKey.h
@@ -37,6 +37,7 @@ public:
     bool                isExpired(time_t currentTime) const;
     bool                isTrial() const;
     bool                isTemporary() const;
+    bool                isValid() const;
     time_t                daysLeft(time_t currentTime) const;
     std::string            email() const;
     Edition                edition() const;
@@ -62,7 +63,7 @@ private:
     unsigned              m_userLimit;
     unsigned long long    m_warnTime;
     unsigned long long    m_expireTime;
-	SerialKeyEdition      m_edition;
+    SerialKeyEdition      m_edition;
     SerialKeyType         m_KeyType;
 };
 
diff --git a/src/test/unittests/shared/SerialKeyTests.cpp b/src/test/unittests/shared/SerialKeyTests.cpp
index e2dcd005f..4c7b09f12 100644
--- a/src/test/unittests/shared/SerialKeyTests.cpp
+++ b/src/test/unittests/shared/SerialKeyTests.cpp
@@ -156,55 +156,74 @@ TEST(SerialKeyTests, daysLeft_expiredV2TrialBasicSerial_returnZero)
 //Subscription license tests
 TEST(SerialKeyTests, isExpiring_validV2SubscriptionBasicSerial_returnFalse)
 {
-	// {v2;subscription;basic;Bob;1;email;company name;1;86400}
-	SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B313B38363430307D");
-	EXPECT_EQ(false, serial.isTrial());
-	EXPECT_EQ(true, serial.isTemporary());
-	EXPECT_FALSE(serial.isExpiring(0));
-	EXPECT_EQ(kBasic, serial.edition());
+    // {v2;subscription;basic;Bob;1;email;company name;1;86400}
+    SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B313B38363430307D");
+    EXPECT_EQ(false, serial.isTrial());
+    EXPECT_EQ(true, serial.isTemporary());
+    EXPECT_FALSE(serial.isExpiring(0));
+    EXPECT_EQ(kBasic, serial.edition());
 }
 
 TEST(SerialKeyTests, isExpiring_expiringV2SubscriptionBasicSerial_returnTrue)
 {
-	// {v2;subscription;basic;Bob;1;email;company name;0;86400}
-	SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
-	EXPECT_EQ(false, serial.isTrial());
-	EXPECT_EQ(true, serial.isTemporary());
-	EXPECT_EQ(true, serial.isExpiring(1));
+    // {v2;subscription;basic;Bob;1;email;company name;0;86400}
+    SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
+    EXPECT_EQ(false, serial.isTrial());
+    EXPECT_EQ(true, serial.isTemporary());
+    EXPECT_EQ(true, serial.isExpiring(1));
 }
 
 TEST(SerialKeyTests, isExpired_expiredV2SubscriptionBasicSerial_returnTrue)
 {
-	// {v2;subscription;basic;Bob;1;email;company name;0;86400}
-	SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
-	EXPECT_EQ(false, serial.isTrial());
-	EXPECT_EQ(true, serial.isTemporary());
-	EXPECT_EQ(true, serial.isExpired(86401));
+    // {v2;subscription;basic;Bob;1;email;company name;0;86400}
+    SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
+    EXPECT_EQ(false, serial.isTrial());
+    EXPECT_EQ(true, serial.isTemporary());
+    EXPECT_EQ(true, serial.isExpired(86401));
 }
 
 //toString method tests
 TEST(SerialKeyTests, toStringV2SubscriptionBasicSerialKey)
 {
-	//{v2;subscription;basic;Bob;1;email;company name;0;86400}
-	const std::string Expected = "7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D";
-	SerialKey serial(Expected);
-	EXPECT_EQ(Expected, serial.toString());
+    //{v2;subscription;basic;Bob;1;email;company name;0;86400}
+    const std::string Expected = "7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D";
+    SerialKey serial(Expected);
+    EXPECT_EQ(Expected, serial.toString());
 }
 
 TEST(SerialKeyTests, toStringV2TrialBasicSerialKey)
 {
-	//{v2;trial;basic;Bob;1;email;company name;0;86400}
-	const std::string Expected = "7B76323B747269616C3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D";
-	SerialKey serial(Expected);
-	EXPECT_EQ(Expected, serial.toString());
+    //{v2;trial;basic;Bob;1;email;company name;0;86400}
+    const std::string Expected = "7B76323B747269616C3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D";
+    SerialKey serial(Expected);
+    EXPECT_EQ(Expected, serial.toString());
 }
 
 TEST(SerialKeyTests, toStringV1BasicSerialKey)
 {
-	//{v1;basic;Bob;1;email;company name;0;0}
-	const std::string Expected = "7B76313B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B307D";
-	SerialKey serial(Expected);
-	EXPECT_EQ(Expected, serial.toString());
+    //{v1;basic;Bob;1;email;company name;0;0}
+    const std::string Expected = "7B76313B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B307D";
+    SerialKey serial(Expected);
+    EXPECT_EQ(Expected, serial.toString());
+}
+
+TEST(SerialKeyTests, IsValidKey_false)
+{
+    //{v1;basic;Bob;1;email;company name;0;0}
+    SerialKey serial(kUnregistered);
+    EXPECT_EQ(false, serial.isValid());
+}
+
+TEST(SerialKeyTests, IsValidKey_true)
+{
+    SerialKey serial(kBasic);
+    EXPECT_EQ(true, serial.isValid());
+}
+
+TEST(SerialKeyTests, IsValidExpiredKey_false)
+{
+    SerialKey serial("7B76323B737562736372697074696F6E3B62617369633B426F623B313B656D61696C3B636F6D70616E79206E616D653B303B38363430307D");
+    EXPECT_EQ(false, serial.isValid());
 }