diff --git a/src/gui/src/LicenseManager.cpp b/src/gui/src/LicenseManager.cpp
index ce2c48578..cd4272c59 100644
--- a/src/gui/src/LicenseManager.cpp
+++ b/src/gui/src/LicenseManager.cpp
@@ -61,7 +61,7 @@ LicenseManager::setSerialKey(SerialKey serialKey, bool acceptExpired)
 }
 
 void
-LicenseManager::notifyUpdate(QString fromVersion, QString toVersion) {
+LicenseManager::notifyUpdate(QString fromVersion, QString toVersion) const {
 	if ((fromVersion == "Unknown")
 		&& (m_serialKey == SerialKey(kUnregistered))) {
 		return;
@@ -118,7 +118,7 @@ LicenseManager::refresh()
 }
 
 void
-LicenseManager::skipActivation()
+LicenseManager::skipActivation() const
 {
 	notifyActivation ("skip:unknown");
 }
diff --git a/src/gui/src/LicenseManager.h b/src/gui/src/LicenseManager.h
index f8ec07b1c..823354939 100644
--- a/src/gui/src/LicenseManager.h
+++ b/src/gui/src/LicenseManager.h
@@ -37,9 +37,9 @@ public:
     Edition activeEdition() const;
     QString activeEditionName() const;
     SerialKey serialKey() const;
-    void skipActivation();
-    void notifyUpdate(QString fromVersion, QString toVersion);
-    static QString getEditionName(Edition edition, bool trial = false);
+	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;
 
diff --git a/src/lib/shared/SerialKeyType.h b/src/lib/shared/SerialKeyType.h
index bc0c6974d..22b702fca 100644
--- a/src/lib/shared/SerialKeyType.h
+++ b/src/lib/shared/SerialKeyType.h
@@ -26,7 +26,6 @@ public:
 	static const std::string TRIAL;
 	static const std::string TEMPORARY;
 
-public:
 	SerialKeyType();
 
 	void setKeyType(const std::string& Type);
@@ -34,7 +33,7 @@ public:
 	bool isTemporary() const;
 	bool isPermanent() const;
 
-protected:
+private:
 	bool m_isTrial = false;
 	bool m_isTemporary = false;
 };