diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 10064ff18..4026bf105 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -48,7 +48,7 @@ build_clazy_clang_tidy:
 
   script:
     - srcdir=`pwd` && mkdir -p /tmp/okular_build && cd /tmp/okular_build && CC=clang CXX=clazy CXXFLAGS="-Werror -Wno-deprecated-declarations" cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -G Ninja $srcdir && cat compile_commands.json | jq  '[.[] | select(.file | contains("'"$srcdir"'"))]' > compile_commands.aux.json && cat compile_commands.aux.json | jq  '[.[] | select(.file | contains("/synctex/")| not)]' > compile_commands.json
-    - CLAZY_IGNORE_DIRS="settings_core.cpp|settings.cpp" CLAZY_CHECKS="level0,level1,level2,no-ctor-missing-parent-argument,no-copyable-polymorphic,no-qstring-allocations,no-missing-qobject-macro" ninja
+    - CLAZY_IGNORE_DIRS="settings_core.cpp|settings.cpp" CLAZY_CHECKS="level0,level1,level2,no-ctor-missing-parent-argument,no-qstring-allocations,no-missing-qobject-macro" ninja
     # Fix the poppler header, remove when debian:unstable ships poppler 0.82 or later
     - sed -i "N;N;N;N; s#class MediaRendition\;\nclass MovieAnnotation\;\nclass ScreenAnnotation;#class MediaRendition\;#g"  /usr/include/poppler/qt5/poppler-link.h
     - "run-clang-tidy -header-filter='.*/okular/.*' -checks='-*,performance-*,bugprone-*,readability-inconsistent-declaration-parameter-name,readability-string-compare,modernize-redundant-void-arg,modernize-use-bool-literals,modernize-make-unique,modernize-make-shared,modernize-use-override,modernize-use-equals-delete,modernize-use-emplace,modernize-loop-convert,modernize-use-nullptr,-bugprone-macro-parentheses,-bugprone-narrowing-conversions,-bugprone-branch-clone,-bugprone-incorrect-roundings' -config=\"{WarningsAsErrors: '*'}\""
diff --git a/core/action.cpp b/core/action.cpp
index 66e78330f..acf6ae051 100644
--- a/core/action.cpp
+++ b/core/action.cpp
@@ -32,6 +32,9 @@ class Okular::ActionPrivate
             qDeleteAll( m_nextActions );
         }
 
+        ActionPrivate(const ActionPrivate &) = delete;
+        ActionPrivate &operator=(const ActionPrivate &) = delete;
+
         QVariant m_nativeId;
         QVector< Action * > m_nextActions;
 };
diff --git a/core/annotations.cpp b/core/annotations.cpp
index f1d3b315d..ac8a2f381 100644
--- a/core/annotations.cpp
+++ b/core/annotations.cpp
@@ -168,6 +168,10 @@ QRect AnnotationUtils::annotationGeometry( const Annotation * annotation,
 }
 //END AnnotationUtils implementation
 
+AnnotationProxy::AnnotationProxy()
+{
+}
+
 AnnotationProxy::~AnnotationProxy()
 {
 }
diff --git a/core/annotations.h b/core/annotations.h
index bb7de968f..0e1f3ced3 100644
--- a/core/annotations.h
+++ b/core/annotations.h
@@ -716,11 +716,16 @@ class OKULARCORE_EXPORT AnnotationProxy
             Removal         ///< Generator can remove native annotations
         };
 
+        AnnotationProxy();
+
         /**
          * Destroys the annotation proxy.
          */
         virtual ~AnnotationProxy();
 
+        AnnotationProxy(const AnnotationProxy &) = delete;
+        AnnotationProxy &operator=(const AnnotationProxy &) = delete;
+
         /**
          * Query for the supported capabilities.
          */
diff --git a/core/annotations_p.h b/core/annotations_p.h
index ab4113c34..50c26a161 100644
--- a/core/annotations_p.h
+++ b/core/annotations_p.h
@@ -32,6 +32,9 @@ class AnnotationPrivate
 
         virtual ~AnnotationPrivate();
 
+        AnnotationPrivate(const AnnotationPrivate &) = delete;
+        AnnotationPrivate &operator=(const AnnotationPrivate &) = delete;
+
         /**
          * Transforms the annotation coordinates with the transformation
          * defined by @p matrix.
diff --git a/core/area.h b/core/area.h
index 0746acdff..94971fd7e 100644
--- a/core/area.h
+++ b/core/area.h
@@ -493,6 +493,9 @@ class OKULARCORE_EXPORT ObjectRect
          */
         virtual ~ObjectRect();
 
+        ObjectRect(const ObjectRect &o) = delete;
+        ObjectRect &operator=(const ObjectRect &o) = delete;
+
         /**
          * Returns the object type of the object rectangle.
          * @see ObjectType
diff --git a/core/bookmarkmanager.cpp b/core/bookmarkmanager.cpp
index 00594a819..b40ac8f8b 100644
--- a/core/bookmarkmanager.cpp
+++ b/core/bookmarkmanager.cpp
@@ -106,6 +106,9 @@ class BookmarkManager::Private : public KBookmarkOwner
             // delete manager;
         }
 
+        Private(const Private &) = delete;
+        Private &operator=(const Private &) = delete;
+
         QUrl currentUrl() const override;
         QString currentTitle() const override;
         bool enableOption(BookmarkOption option) const override;
diff --git a/core/document.h b/core/document.h
index 8c3f494e0..73c9c8686 100644
--- a/core/document.h
+++ b/core/document.h
@@ -1410,6 +1410,9 @@ class OKULARCORE_EXPORT EmbeddedFile
          */
         virtual ~EmbeddedFile();
 
+        EmbeddedFile(const EmbeddedFile &) = delete;
+        EmbeddedFile &operator=(const EmbeddedFile &) = delete;
+
         /**
          * Returns the name of the file
          */
diff --git a/core/form_p.h b/core/form_p.h
index cbba06272..6c937ff57 100644
--- a/core/form_p.h
+++ b/core/form_p.h
@@ -25,6 +25,9 @@ class FormFieldPrivate
         explicit FormFieldPrivate( FormField::FieldType type );
         virtual ~FormFieldPrivate();
 
+        FormFieldPrivate(const FormFieldPrivate &) = delete;
+        FormFieldPrivate  &operator=(const FormFieldPrivate &) = delete;
+
         void setDefault();
 
         virtual void setValue( const QString& ) = 0;
diff --git a/core/observer.h b/core/observer.h
index 9474b5192..5a2520611 100644
--- a/core/observer.h
+++ b/core/observer.h
@@ -37,6 +37,9 @@ class OKULARCORE_EXPORT DocumentObserver
          */
         virtual ~DocumentObserver();
 
+        DocumentObserver(const DocumentObserver &) = delete;
+        DocumentObserver &operator=(const DocumentObserver &) = delete;
+
         /**
          * Flags that can be sent from the document to all observers to
          * inform them about the type of object that has been changed.
diff --git a/core/rotationjob_p.h b/core/rotationjob_p.h
index d33ab0cef..5376a10eb 100644
--- a/core/rotationjob_p.h
+++ b/core/rotationjob_p.h
@@ -33,6 +33,9 @@ class RotationJobInternal : public ThreadWeaver::Job
         Rotation rotation() const;
         NormalizedRect rect() const;
 
+        RotationJobInternal(const RotationJobInternal &) = delete;
+        RotationJobInternal &operator=(const RotationJobInternal &) = delete;
+
     protected:
         void run(ThreadWeaver::JobPointer self, ThreadWeaver::Thread *thread) override;
 
diff --git a/core/view_p.h b/core/view_p.h
index 53602803b..7d5c7fe7f 100644
--- a/core/view_p.h
+++ b/core/view_p.h
@@ -24,6 +24,9 @@ class ViewPrivate
         ViewPrivate();
         virtual ~ViewPrivate();
 
+        ViewPrivate(const ViewPrivate &) = delete;
+        ViewPrivate &operator=(const ViewPrivate &) = delete;
+
         QString name;
         DocumentPrivate *document;
 };
diff --git a/generators/chm/kio-msits/msits.h b/generators/chm/kio-msits/msits.h
index 9e02cf878..83288f034 100644
--- a/generators/chm/kio-msits/msits.h
+++ b/generators/chm/kio-msits/msits.h
@@ -37,6 +37,9 @@ public:
     ProtocolMSITS ( const QByteArray&, const QByteArray& );
     ~ProtocolMSITS() override;
 
+    ProtocolMSITS(const ProtocolMSITS &) = delete;
+    ProtocolMSITS &operator=(const ProtocolMSITS &) = delete;
+
     void	get (const QUrl & ) override;
     void	listDir (const QUrl & url) override;
     void	stat (const QUrl & url) override;
diff --git a/generators/chm/lib/ebook.h b/generators/chm/lib/ebook.h
index d0b39f565..e05ae39d1 100644
--- a/generators/chm/lib/ebook.h
+++ b/generators/chm/lib/ebook.h
@@ -84,6 +84,9 @@ class EBook
 		EBook();
 		virtual ~EBook();
 
+		EBook(const EBook &) = delete;
+		EBook &operator=(const EBook &) = delete;
+
 		/*!
 		 * \brief Attempts to load chm or epub file.
 		 * \param archiveName filename.
diff --git a/generators/comicbook/unrarflavours.h b/generators/comicbook/unrarflavours.h
index cf5e07fe1..4789c952a 100644
--- a/generators/comicbook/unrarflavours.h
+++ b/generators/comicbook/unrarflavours.h
@@ -29,6 +29,9 @@ class UnrarFlavour
     public:
         virtual ~UnrarFlavour();
 
+        UnrarFlavour(const UnrarFlavour &) = delete;
+        UnrarFlavour &operator=(const UnrarFlavour &) = delete;
+
         virtual QStringList processListing( const QStringList &data ) = 0;
         virtual QString name() const = 0;
 
diff --git a/generators/djvu/kdjvu.h b/generators/djvu/kdjvu.h
index d8366b7bc..e50316f1b 100644
--- a/generators/djvu/kdjvu.h
+++ b/generators/djvu/kdjvu.h
@@ -70,8 +70,12 @@ class KDjVu
             friend class KDjVu;
 
             public:
+                Link() = default;
                 virtual ~Link();
 
+                Link(const Link &) = delete;
+                Link &operator=(const Link &) = delete;
+
                 enum LinkType { PageLink, UrlLink };
                 enum LinkArea { UnknownArea, RectArea, EllipseArea, PolygonArea };
                 virtual int type() const = 0;
@@ -130,6 +134,9 @@ class KDjVu
             public:
                 virtual ~Annotation();
 
+                Annotation(const Annotation &) = delete;
+                Annotation &operator=(const Annotation &) = delete;
+
                 enum AnnotationType { TextAnnotation, LineAnnotation };
                 virtual int type() const = 0;
                 QPoint point() const;
diff --git a/generators/dvi/TeXFont.h b/generators/dvi/TeXFont.h
index d9478e280..63c3fbcb8 100644
--- a/generators/dvi/TeXFont.h
+++ b/generators/dvi/TeXFont.h
@@ -23,6 +23,9 @@ class TeXFont {
 
   virtual ~TeXFont();
 
+  TeXFont(const TeXFont &) = delete;
+  TeXFont &operator=(const TeXFont &) = delete;
+
   void setDisplayResolution()
     {
       for(glyph &g : glyphtable)
diff --git a/generators/dvi/dviPageInfo.cpp b/generators/dvi/dviPageInfo.cpp
index 3864c5c35..04c9dd94b 100644
--- a/generators/dvi/dviPageInfo.cpp
+++ b/generators/dvi/dviPageInfo.cpp
@@ -9,14 +9,6 @@
 
 #include "dviPageInfo.h"
 
-dviPageInfo::dviPageInfo( const dviPageInfo &dvipi )
-{
-    width = dvipi.width; 
-    height = dvipi.height;
-    resolution = dvipi.resolution;
-    pageNumber = dvipi.pageNumber;
-}
-
 dviPageInfo::dviPageInfo() 
 {
     sourceHyperLinkList.reserve(200);
diff --git a/generators/dvi/dviPageInfo.h b/generators/dvi/dviPageInfo.h
index 8a7e781a1..58d9c445e 100644
--- a/generators/dvi/dviPageInfo.h
+++ b/generators/dvi/dviPageInfo.h
@@ -26,10 +26,12 @@ public:
    PageNumber pageNumber;
 
    dviPageInfo();
-   dviPageInfo( const dviPageInfo &dvipi );
-   
+
    virtual ~dviPageInfo();
 
+   dviPageInfo(const dviPageInfo &) = delete;
+   dviPageInfo &operator=(const dviPageInfo &) = delete;
+
    virtual void clear();
 
    /** \brief List of source hyperlinks
diff --git a/generators/dvi/generator_dvi.cpp b/generators/dvi/generator_dvi.cpp
index e85e64a21..9de36749d 100644
--- a/generators/dvi/generator_dvi.cpp
+++ b/generators/dvi/generator_dvi.cpp
@@ -212,17 +212,12 @@ QImage DviGenerator::image( Okular::PixmapRequest *request )
 
         if (s.isValid())
         {
-            ps = s; /* it should be the user specified size, if any, instead */
+            pageInfo->resolution = (double)(pageInfo->width)/s.width().getLength_in_inch();
+        }
+        else
+        {
+            pageInfo->resolution = (double)(pageInfo->width)/ps.width().getLength_in_inch();
         }
-
-        pageInfo->resolution = (double)(pageInfo->width)/ps.width().getLength_in_inch();
-
-#if 0
-        qCDebug(OkularDviDebug) << *request
-        << ", res:" << pageInfo->resolution << " - (" << pageInfo->width << ","
-        << ps.width().getLength_in_inch() << ")," << ps.width().getLength_in_mm()
-        << endl;
-#endif
 
         m_dviRenderer->drawPage( pageInfo );
 
diff --git a/generators/dvi/pageSize.cpp b/generators/dvi/pageSize.cpp
index 265f7ecd9..c282f7afd 100644
--- a/generators/dvi/pageSize.cpp
+++ b/generators/dvi/pageSize.cpp
@@ -171,21 +171,6 @@ void pageSize::setPageSize(const QString& width, const QString& _widthUnits, con
     emit sizeChanged(*this);
 }
 
-
-pageSize &pageSize::operator= (const pageSize &src)
-{
-  SimplePageSize oldPage = *this;
-
-  currentSize = src.currentSize;
-  pageWidth   = src.pageWidth;
-  pageHeight  = src.pageHeight;
-
-  if ( !isNearlyEqual(oldPage))
-    emit sizeChanged(*this);
-  return *this;
-}
-
-
 void pageSize::rectifySizes()
 {
   // Now do some sanity checks to make sure that values are not
diff --git a/generators/dvi/pageSize.h b/generators/dvi/pageSize.h
index aab62d649..ed33bad1c 100644
--- a/generators/dvi/pageSize.h
+++ b/generators/dvi/pageSize.h
@@ -53,6 +53,9 @@ public:
   /** \brief Initializes the pageSize with a SimplePageSize. */
   pageSize(const SimplePageSize&);
 
+  pageSize(const pageSize &) = delete;
+  pageSize &operator=(const pageSize &) = delete;
+
   /** \brief List of standard pageSizes
 
   This method returns the names of standard pageSizes,
@@ -139,16 +142,9 @@ public:
 
   @param height_in_mm page height in mm
   */
-  virtual void setPageSize(double width_in_mm, double height_in_mm);
+  void setPageSize(double width_in_mm, double height_in_mm);
   using SimplePageSize::setPageSize;
 
-  /** \brief Copy operator.
-
-  This operator will emit the signal sizeChanged() if one of the
-  dimensions of *this and src differ by more than two millimeters.
-  */
-  pageSize &  operator= (const pageSize &src);
-
   /** \brief Preferred unit for the current page size
 
   @returns The name of the unit, one of "cm", "mm" or "in", which is
diff --git a/generators/dvi/simplePageSize.h b/generators/dvi/simplePageSize.h
index 6e14eb176..32161c672 100644
--- a/generators/dvi/simplePageSize.h
+++ b/generators/dvi/simplePageSize.h
@@ -47,7 +47,7 @@ class SimplePageSize
   */
   SimplePageSize(const Length width, const Length height) { pageWidth = width; pageHeight = height; }
 
-  virtual ~SimplePageSize() {}
+  ~SimplePageSize() {}
 
   /** \brief Sets the page width and height
 
@@ -57,7 +57,7 @@ class SimplePageSize
   @param width
   @param height
   */
-  virtual void setPageSize(const Length width, const Length height) { pageWidth = width; pageHeight = height; }
+  void setPageSize(const Length width, const Length height) { pageWidth = width; pageHeight = height; }
 
   /** \brief Returns the page width. */
   Length width() const { return pageWidth; }
diff --git a/interfaces/configinterface.h b/interfaces/configinterface.h
index bb6181cf7..1dc88161e 100644
--- a/interfaces/configinterface.h
+++ b/interfaces/configinterface.h
@@ -38,11 +38,16 @@ namespace Okular {
 class OKULARCORE_EXPORT ConfigInterface
 {
     public:
+        ConfigInterface() {}
+
         /**
          * Destroys the config interface.
          */
         virtual ~ConfigInterface() {}
 
+        ConfigInterface(const ConfigInterface &) = delete;
+        ConfigInterface &operator=(const ConfigInterface &) = delete;
+
         /**
          * This method is called to tell the generator to re-parse its configuration.
          *
diff --git a/interfaces/guiinterface.h b/interfaces/guiinterface.h
index c56daa4f9..937462d19 100644
--- a/interfaces/guiinterface.h
+++ b/interfaces/guiinterface.h
@@ -39,11 +39,16 @@ namespace Okular {
 class OKULARCORE_EXPORT GuiInterface : protected KXMLGUIClient
 {
     public:
+        GuiInterface() {}
+
         /**
          * Destroys the gui interface.
          */
         ~GuiInterface() override {}
 
+        GuiInterface(const GuiInterface &) = delete;
+        GuiInterface &operator=(const GuiInterface &) = delete;
+
         /**
          * This method requests the XML GUI Client provided by the interface.
          */
diff --git a/interfaces/printinterface.h b/interfaces/printinterface.h
index 334deda6e..dbc86ba0b 100644
--- a/interfaces/printinterface.h
+++ b/interfaces/printinterface.h
@@ -39,11 +39,16 @@ namespace Okular {
 class OKULARCORE_EXPORT PrintInterface
 {
     public:
+        PrintInterface() {}
+
         /**
          * Destroys the printer interface.
          */
         virtual ~PrintInterface() {}
 
+        PrintInterface(const PrintInterface &) = delete;
+        PrintInterface &operator=(const PrintInterface &) = delete;
+
         /**
          * Builds and returns a new printing configuration widget.
          *
diff --git a/interfaces/saveinterface.h b/interfaces/saveinterface.h
index f052209e9..534b5328e 100644
--- a/interfaces/saveinterface.h
+++ b/interfaces/saveinterface.h
@@ -49,11 +49,16 @@ class OKULARCORE_EXPORT SaveInterface
         };
         Q_DECLARE_FLAGS( SaveOptions, SaveOption )
 
+        SaveInterface() {}
+
         /**
          * Destroys the save interface.
          */
         virtual ~SaveInterface() {}
 
+        SaveInterface(const SaveInterface &) = delete;
+        SaveInterface &operator=(const SaveInterface &) = delete;
+
         /**
          * Query for the supported saving options.
          *
diff --git a/interfaces/viewerinterface.h b/interfaces/viewerinterface.h
index 929bc1c19..4bb8028fc 100644
--- a/interfaces/viewerinterface.h
+++ b/interfaces/viewerinterface.h
@@ -31,8 +31,12 @@ namespace Okular {
 class VIEWERINTERFACE_EXPORT ViewerInterface
 {
     public:
+        ViewerInterface() {}
         virtual ~ViewerInterface() {}
 
+        ViewerInterface(const ViewerInterface &) = delete;
+        ViewerInterface &operator=(const ViewerInterface &) = delete;
+
         /**
          * Show the specified source location centrally in the viewer.
          *
diff --git a/kdocumentviewer.h b/kdocumentviewer.h
index 02d30ff61..8d771bf59 100644
--- a/kdocumentviewer.h
+++ b/kdocumentviewer.h
@@ -24,8 +24,12 @@ class QUrl;
 class OKULARPART_EXPORT KDocumentViewer
 {
     public:
+        KDocumentViewer() {}
         virtual ~KDocumentViewer() {}
 
+        KDocumentViewer(const KDocumentViewer &) = delete;
+        KDocumentViewer &operator=(const KDocumentViewer &) = delete;
+
         /**
          * Open the document at the specified @p url at page @p page.
          */
diff --git a/ui/annotationtools.h b/ui/annotationtools.h
index bd048029f..c41bcf9f9 100644
--- a/ui/annotationtools.h
+++ b/ui/annotationtools.h
@@ -35,6 +35,9 @@ class AnnotatorEngine
         explicit AnnotatorEngine( const QDomElement & engineElement );
         virtual ~AnnotatorEngine();
 
+        AnnotatorEngine(const AnnotatorEngine &) = delete;
+        AnnotatorEngine &operator=(const AnnotatorEngine &) = delete;
+
         // enum definitions
         enum EventType { Press, Move, Release };
         enum Button { None, Left, Right };
diff --git a/ui/bookmarklist.cpp b/ui/bookmarklist.cpp
index 002fa7daf..ac6af93a9 100644
--- a/ui/bookmarklist.cpp
+++ b/ui/bookmarklist.cpp
@@ -47,6 +47,9 @@ class BookmarkItem : public QTreeWidgetItem
                 setData( 0, PageItemDelegate::PageRole, QString::number( m_viewport.pageNumber + 1 ) );
         }
 
+        BookmarkItem(const BookmarkItem &) = delete;
+        BookmarkItem &operator=(const BookmarkItem &) = delete;
+
         QVariant data( int column, int role ) const override
         {
             switch ( role )
@@ -101,6 +104,9 @@ class FileItem : public QTreeWidgetItem
             setData( 0, UrlRole, QVariant::fromValue( url ) );
         }
 
+        FileItem(const FileItem &) = delete;
+        FileItem &operator=(const FileItem &) = delete;
+
         QVariant data( int column, int role ) const override
         {
             switch ( role )
diff --git a/ui/formwidgets.h b/ui/formwidgets.h
index a438f4aab..ece7970f7 100644
--- a/ui/formwidgets.h
+++ b/ui/formwidgets.h
@@ -161,6 +161,9 @@ class FormWidgetIface
         FormWidgetIface( QWidget * w, Okular::FormField * ff );
         virtual ~FormWidgetIface();
 
+        FormWidgetIface(const FormWidgetIface &) = delete;
+        FormWidgetIface &operator=(const FormWidgetIface &) = delete;
+
         Okular::NormalizedRect rect() const;
         void setWidthHeight( int w, int h );
         void moveTo( int x, int y );
diff --git a/ui/sidebar.cpp b/ui/sidebar.cpp
index d8748599d..82d1f2582 100644
--- a/ui/sidebar.cpp
+++ b/ui/sidebar.cpp
@@ -50,6 +50,9 @@ class SidebarItem : public QListWidgetItem
             setToolTip( text );
         }
 
+        SidebarItem(const SidebarItem &) = delete;
+        SidebarItem &operator=(const SidebarItem &) = delete;
+
         QWidget* widget() const
         {
             return m_widget;