diff --git a/encfs/DirNode.cpp b/encfs/DirNode.cpp
index 2c6271b..ecbdf43 100644
--- a/encfs/DirNode.cpp
+++ b/encfs/DirNode.cpp
@@ -142,10 +142,14 @@ class RenameOp {
     last = renameList->begin();
   }
 
-  RenameOp(const RenameOp &src) = default;
-
+  // destructor
   ~RenameOp();
 
+  RenameOp(const RenameOp &src) = delete; // copy contructor
+  RenameOp(RenameOp&& other) = delete; // move constructor
+  RenameOp& operator=(const RenameOp& other) = delete; // copy assignment
+  RenameOp& operator=(RenameOp&& other) = delete; // move assignment
+
   explicit operator bool() const { return renameList != nullptr; }
 
   bool apply();
diff --git a/encfs/NullCipher.cpp b/encfs/NullCipher.cpp
index 4e916ca..50dadff 100644
--- a/encfs/NullCipher.cpp
+++ b/encfs/NullCipher.cpp
@@ -50,16 +50,32 @@ static bool NullCipher_registered = Cipher::Register(
 class NullKey : public AbstractCipherKey {
  public:
   NullKey() = default;
+
+  // destructor
   ~NullKey() override = default;
+
+  NullKey(const NullKey &src) = delete; // copy constructor
+  NullKey(NullKey&& other) = delete; // move constructor
+  NullKey& operator=(const NullKey& other) = delete; // copy assignment
+  NullKey& operator=(NullKey&& other) = delete; // move assignment
 };
 
 class NullDestructor {
  public:
   NullDestructor() = default;
-  NullDestructor(const NullDestructor &) = default;
+
+  // destructor
   ~NullDestructor() = default;
 
-  NullDestructor &operator=(const NullDestructor &) = default;
+  // copy contructor
+  NullDestructor(const NullDestructor &) = default;
+
+  // move constructor
+  NullDestructor(NullDestructor &&) = default;
+
+  NullDestructor &operator=(const NullDestructor &) = delete; // copy assignment
+  NullDestructor& operator=(NullDestructor&& other) = delete; // move assignment
+
   void operator()(NullKey *&) {}
 };
 std::shared_ptr<AbstractCipherKey> gNullKey(new NullKey(), NullDestructor());
diff --git a/encfs/SSL_Cipher.cpp b/encfs/SSL_Cipher.cpp
index 384fba8..d39a39c 100644
--- a/encfs/SSL_Cipher.cpp
+++ b/encfs/SSL_Cipher.cpp
@@ -293,7 +293,14 @@ class SSLKey : public AbstractCipherKey {
   HMAC_CTX *mac_ctx;
 
   SSLKey(int keySize, int ivLength);
+
+  // destructor
   ~SSLKey() override;
+
+  SSLKey(const SSLKey &src) = delete; // copy constructor
+  SSLKey(SSLKey&& other) = delete; // move constructor
+  SSLKey& operator=(const SSLKey& other) = delete; // copy assignment
+  SSLKey& operator=(SSLKey&& other) = delete; // move assignment
 };
 
 SSLKey::SSLKey(int keySize_, int ivLength_) {
diff --git a/encfs/XmlReader.cpp b/encfs/XmlReader.cpp
index 770cc96..89dc995 100644
--- a/encfs/XmlReader.cpp
+++ b/encfs/XmlReader.cpp
@@ -169,8 +169,14 @@ class XmlNode : virtual public XmlValue {
   explicit XmlNode(const tinyxml2::XMLElement *element_)
       : XmlValue(safeValueForNode(element_)), element(element_) {}
 
+  // destructor
   ~XmlNode() override = default;
 
+  XmlNode(const XmlNode &src) = delete; // copy constructor
+  XmlNode(XmlNode&& other) = delete; // move constructor
+  XmlNode& operator=(const XmlNode& other) = delete; // copy assignment
+  XmlNode& operator=(XmlNode&& other) = delete; // move assignment
+
   XmlValuePtr find(const char *name) const override {
     if (name[0] == '@') {
       const char *value = element->Attribute(name + 1);