diff --git a/gui/inc/TGDNDManager.h b/gui/inc/TGDNDManager.h
index 8323eaeb9f81994c0b55cc8c94e79c85dbcb7ddd..964050a3a22714624fd87a55435eea5857172b87 100755
--- a/gui/inc/TGDNDManager.h
+++ b/gui/inc/TGDNDManager.h
@@ -65,9 +65,13 @@ public:
 //_____________________________________________________________________________
 
 class TDNDData : public TObject {
+private:
+   TDNDData(const TDNDData&);            // Not implemented
+   TDNDData& operator=(const TDNDData&); // Not implemented
+
 public:
-   TDNDData(Atom_t dt = kNone, void *d = 0, Int_t len = 0, Atom_t act = kNone)
-           { fDataType = dt; fData = d; fDataLength = len; fAction = act; }
+   TDNDData(Atom_t dt = kNone, void *d = 0, Int_t len = 0, Atom_t act = kNone) :
+      fDataType(dt), fAction(act), fData(d), fDataLength(len) {}
    ~TDNDData() {}
 
    Atom_t    fDataType;       // Data type description
@@ -82,6 +86,10 @@ public:
 
 class TGDNDManager : public TObject {
 
+private:
+   TGDNDManager(const TGDNDManager&);            // Not implemented
+   TGDNDManager& operator=(const TGDNDManager&); // Not implemented
+
 protected:
    TGFrame       *fMain;                         // pointer on TGMainFrame
    Atom_t         fVersion;                      // not really an Atom, but a long
diff --git a/gui/inc/TGFont.h b/gui/inc/TGFont.h
index 6256c1483c991e5e7b8fec12f9e171b4e2946f23..cc2595ab67117b881741b78ff85de59741919e1c 100644
--- a/gui/inc/TGFont.h
+++ b/gui/inc/TGFont.h
@@ -89,6 +89,26 @@ struct FontAttributes_t {
       fSlant     (kFontSlantRoman),
       fUnderline (0),
       fOverstrike(0) { }
+
+   FontAttributes_t(const FontAttributes_t& f): // copy constructor
+      fFamily    (f.fFamily),
+      fPointsize (f.fPointsize),
+      fWeight    (f.fWeight),
+      fSlant     (f.fSlant),
+      fUnderline (f.fUnderline),
+      fOverstrike(f.fOverstrike) { }
+
+   FontAttributes_t& operator=(const FontAttributes_t& f) // assignment operator
+   {
+      fFamily     = f.fFamily;
+      fPointsize  = f.fPointsize;
+      fWeight     = f.fWeight;
+      fSlant      = f.fSlant;
+      fUnderline  = f.fUnderline;
+      fOverstrike = f.fOverstrike;
+      return *this;
+   }
+
 };
 
 
diff --git a/xmlparser/inc/TDOMParser.h b/xmlparser/inc/TDOMParser.h
index 89f0b171cc353b211e8d6a32d79bca540a4ea958..f323ae7fc858c26e7f5dfc71527ba58a76df97e7 100644
--- a/xmlparser/inc/TDOMParser.h
+++ b/xmlparser/inc/TDOMParser.h
@@ -38,6 +38,9 @@
 class TDOMParser : public TXMLParser {
 
 private:
+   TDOMParser(const TDOMParser&);            // Not implemented
+   TDOMParser& operator=(const TDOMParser&); // Not implemented
+
    TXMLDocument *fTXMLDoc;      // xmlDoc
 
    Int_t ParseContext();
diff --git a/xmlparser/inc/TXMLDocument.h b/xmlparser/inc/TXMLDocument.h
index 3de149e76087921226013f0708ea65319cca775b..174153c74995e337117c462856d62e1bbe3ae55b 100644
--- a/xmlparser/inc/TXMLDocument.h
+++ b/xmlparser/inc/TXMLDocument.h
@@ -37,6 +37,9 @@ class TXMLNode;
 class TXMLDocument : public TObject {
 
 private:
+   TXMLDocument(const TXMLDocument&);            // Not implemented
+   TXMLDocument& operator=(const TXMLDocument&); // Not implemented
+
    _xmlDoc  *fXMLDoc;           // libxml xml doc
    TXMLNode *fRootNode;         // the root node 
 
diff --git a/xmlparser/inc/TXMLNode.h b/xmlparser/inc/TXMLNode.h
index 65b1b1c2e2417ac5b2f307e2488ee10855d4a6b9..f0110077724f088d6414550c204554bfb718eb6d 100644
--- a/xmlparser/inc/TXMLNode.h
+++ b/xmlparser/inc/TXMLNode.h
@@ -40,6 +40,9 @@ struct _xmlNode;
 class TXMLNode : public TObject {
 
 private:
+   TXMLNode(const TXMLNode&);            // Not implemented
+   TXMLNode& operator=(const TXMLNode&); // Not implemented
+
    _xmlNode *fXMLNode;        // libxml node
 
    TXMLNode *fParent;         // Parent node
diff --git a/xmlparser/inc/TXMLParser.h b/xmlparser/inc/TXMLParser.h
index e69aa970ae4be3c19e83db18ac98f98d4a524cc7..825286eb363027566511e3bacdde3fb0ae928be3 100644
--- a/xmlparser/inc/TXMLParser.h
+++ b/xmlparser/inc/TXMLParser.h
@@ -45,6 +45,10 @@ struct   _xmlParserCtxt;
 
 class TXMLParser : public TObject, public TQObject {
 
+private:
+   TXMLParser(const TXMLParser&);            // Not implemented
+   TXMLParser& operator=(const TXMLParser&); // Not implemented
+
 protected:
    _xmlParserCtxt     *fContext;          // parse the xml file
    Bool_t              fValidate;         // to validate the parse context