diff --git a/3d-viewer/3d_rendering/raytracing/accelerators/bvh_pbrt.h b/3d-viewer/3d_rendering/raytracing/accelerators/bvh_pbrt.h
index 0c12795785..fc58e1f47c 100644
--- a/3d-viewer/3d_rendering/raytracing/accelerators/bvh_pbrt.h
+++ b/3d-viewer/3d_rendering/raytracing/accelerators/bvh_pbrt.h
@@ -115,6 +115,11 @@ public:
 
     ~BVH_PBRT();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    BVH_PBRT( const BVH_PBRT& ) = delete;
+    BVH_PBRT& operator=( const BVH_PBRT& ) = delete;
+
     bool Intersect( const RAY& aRay, HITINFO& aHitInfo ) const override;
     bool Intersect( const RAY& aRay, HITINFO& aHitInfo, unsigned int aAccNodeInfo ) const override;
     bool Intersect( const RAYPACKET& aRayPacket, HITINFO_PACKET* aHitInfoPacket ) const override;
diff --git a/3d-viewer/3d_rendering/raytracing/accelerators/container_2d.h b/3d-viewer/3d_rendering/raytracing/accelerators/container_2d.h
index 21100237a8..2720981aae 100644
--- a/3d-viewer/3d_rendering/raytracing/accelerators/container_2d.h
+++ b/3d-viewer/3d_rendering/raytracing/accelerators/container_2d.h
@@ -22,12 +22,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-/**
- * @file  container_2d.h
- */
-
-#ifndef _CONTAINER_2D_H_
-#define _CONTAINER_2D_H_
+#pragma once
 
 #include "../shapes2D/object_2d.h"
 #include <list>
@@ -71,8 +66,7 @@ public:
      * @param aBBox The bounding box to test.
      * @param aOutList The list of objects that intersects the bounding box.
      */
-    virtual void GetIntersectingObjects( const BBOX_2D& aBBox,
-                                         CONST_LIST_OBJECT2D& aOutList ) const = 0;
+    virtual void GetIntersectingObjects( const BBOX_2D& aBBox, CONST_LIST_OBJECT2D& aOutList ) const = 0;
 
     /**
      * Intersect and check if a segment ray hits a object or is inside it.
@@ -83,11 +77,11 @@ public:
     virtual bool IntersectAny( const RAYSEG2D& aSegRay ) const = 0;
 
 protected:
-    BBOX_2D m_bbox;
+    BBOX_2D       m_bbox;
     LIST_OBJECT2D m_objects;
 
 private:
-    std::mutex m_lock;
+    std::mutex    m_lock;
 };
 
 
@@ -96,8 +90,7 @@ class CONTAINER_2D : public CONTAINER_2D_BASE
 public:
     CONTAINER_2D();
 
-    void GetIntersectingObjects( const BBOX_2D& aBBox,
-                                 CONST_LIST_OBJECT2D& aOutList ) const override;
+    void GetIntersectingObjects( const BBOX_2D& aBBox, CONST_LIST_OBJECT2D& aOutList ) const override;
 
     bool IntersectAny( const RAYSEG2D& aSegRay ) const override;
 };
@@ -119,28 +112,30 @@ public:
     BVH_CONTAINER_2D();
     ~BVH_CONTAINER_2D();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    BVH_CONTAINER_2D( const BVH_CONTAINER_2D& ) = delete;
+    BVH_CONTAINER_2D& operator=( const BVH_CONTAINER_2D& ) = delete;
+
     void BuildBVH();
 
     void Clear() override;
 
-    void GetIntersectingObjects( const BBOX_2D& aBBox,
-                                 CONST_LIST_OBJECT2D& aOutList ) const override;
+    void GetIntersectingObjects( const BBOX_2D& aBBox, CONST_LIST_OBJECT2D& aOutList ) const override;
 
     bool IntersectAny( const RAYSEG2D& aSegRay ) const override;
 
 private:
     void destroy();
     void recursiveBuild_MIDDLE_SPLIT( BVH_CONTAINER_NODE_2D* aNodeParent );
-    void recursiveGetListObjectsIntersects( const BVH_CONTAINER_NODE_2D* aNode,
-                                            const BBOX_2D& aBBox,
+    void recursiveGetListObjectsIntersects( const BVH_CONTAINER_NODE_2D* aNode, const BBOX_2D& aBBox,
                                             CONST_LIST_OBJECT2D& aOutList ) const;
-    bool recursiveIntersectAny( const BVH_CONTAINER_NODE_2D* aNode,
-                                const RAYSEG2D& aSegRay ) const;
+    bool recursiveIntersectAny( const BVH_CONTAINER_NODE_2D* aNode, const RAYSEG2D& aSegRay ) const;
 
-    bool m_isInitialized;
+private:
+    bool                              m_isInitialized;
     std::list<BVH_CONTAINER_NODE_2D*> m_elementsToDelete;
-    BVH_CONTAINER_NODE_2D* m_tree;
+    BVH_CONTAINER_NODE_2D*            m_tree;
 
 };
 
-#endif // _CONTAINER_2D_H_
diff --git a/3d-viewer/3d_rendering/raytracing/shapes2D/layer_item_2d.h b/3d-viewer/3d_rendering/raytracing/shapes2D/layer_item_2d.h
index 7248bb6dac..567eea78bf 100644
--- a/3d-viewer/3d_rendering/raytracing/shapes2D/layer_item_2d.h
+++ b/3d-viewer/3d_rendering/raytracing/shapes2D/layer_item_2d.h
@@ -23,12 +23,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-/**
- * @file layer_item_2d.h
- */
-
-#ifndef _LAYER_ITEM_2D_H_
-#define _LAYER_ITEM_2D_H_
+#pragma once
 
 #include "object_2d.h"
 #include <vector>
@@ -84,6 +79,11 @@ public:
 
     ~LAYER_ITEM_2D();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    LAYER_ITEM_2D( const LAYER_ITEM_2D& ) = delete;
+    LAYER_ITEM_2D& operator=( const LAYER_ITEM_2D& ) = delete;
+
     // Imported from OBJECT_2D
     bool Overlaps( const BBOX_2D& aBBox ) const override;
     bool Intersects( const BBOX_2D& aBBox ) const override;
@@ -97,4 +97,3 @@ private:
     const OBJECT_2D*                m_objectC;
 };
 
-#endif // _LAYER_ITEM_2D_H_
diff --git a/3d-viewer/dialogs/appearance_controls_3D.h b/3d-viewer/dialogs/appearance_controls_3D.h
index 4f4d51ce39..0e36896841 100644
--- a/3d-viewer/dialogs/appearance_controls_3D.h
+++ b/3d-viewer/dialogs/appearance_controls_3D.h
@@ -18,8 +18,7 @@
  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef APPEARANCE_CONTROLS_3D_H
-#define APPEARANCE_CONTROLS_3D_H
+#pragma once
 
 #include <vector>
 
@@ -113,6 +112,11 @@ public:
     APPEARANCE_CONTROLS_3D( EDA_3D_VIEWER_FRAME* aParent, wxWindow* aFocusOwner );
     ~APPEARANCE_CONTROLS_3D();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    APPEARANCE_CONTROLS_3D( const APPEARANCE_CONTROLS_3D& ) = delete;
+    APPEARANCE_CONTROLS_3D& operator=( const APPEARANCE_CONTROLS_3D& ) = delete;
+
     wxSize GetBestSize() const;
     void OnDarkModeToggle();
     void OnLayerVisibilityChanged( int aLayer, bool isVisible );
@@ -189,5 +193,3 @@ private:
     wxCheckBox*                    m_cbUseBoardStackupColors;
     wxCheckBox*                    m_cbUseBoardEditorCopperColors;
 };
-
-#endif
diff --git a/common/eda_group.h b/common/eda_group.h
index f51689b701..26a55570e0 100644
--- a/common/eda_group.h
+++ b/common/eda_group.h
@@ -73,7 +73,7 @@ public:
     const LIB_ID& GetDesignBlockLibId() const { return m_designBlockLibId; }
 
 protected:
-    std::unordered_set<EDA_ITEM*> m_items;             // Members of the group
+    std::unordered_set<EDA_ITEM*> m_items;             // Members of the group (no ownership)
     wxString                      m_name;              // Optional group name
     LIB_ID                        m_designBlockLibId;  // Optional link to a design block
 };
diff --git a/common/jobs/job.h b/common/jobs/job.h
index 8dd83d91a6..81595cbadd 100644
--- a/common/jobs/job.h
+++ b/common/jobs/job.h
@@ -186,6 +186,11 @@ public:
 
     virtual ~JOB();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    JOB( const JOB& ) = delete;
+    JOB& operator=( const JOB& ) = delete;
+
     const std::string& GetType() const { return m_type; };
 
     const std::map<wxString, wxString>& GetVarOverrides() const { return m_varOverrides; }
diff --git a/common/single_top.cpp b/common/single_top.cpp
index d832c088a3..fc89c3c3bb 100644
--- a/common/single_top.cpp
+++ b/common/single_top.cpp
@@ -260,8 +260,7 @@ struct APP_SINGLE_TOP : public wxApp
                     if( dlgs.back() == dialog )
                         dlgs.pop_back();
                     // If an out-of-order, remove all dialogs added after the closed one
-                    else if( auto it = std::find( dlgs.begin(), dlgs.end(), dialog );
-                             it != dlgs.end() )
+                    else if( auto it = std::find( dlgs.begin(), dlgs.end(), dialog ); it != dlgs.end() )
                         dlgs.erase( it, dlgs.end() );
                 }
             }
diff --git a/common/widgets/grid_text_button_helpers.cpp b/common/widgets/grid_text_button_helpers.cpp
index 4ad10b577c..ebf07eac06 100644
--- a/common/widgets/grid_text_button_helpers.cpp
+++ b/common/widgets/grid_text_button_helpers.cpp
@@ -350,8 +350,12 @@ public:
     ~TEXT_BUTTON_URL()
     {
         Unbind( wxEVT_TEXT, &TEXT_BUTTON_URL::OnTextChange, this );
+
+        m_filesStack.clear();   // we don't own pointers
     }
 
+    // We don't own any of our raw pointers, so compiler's copy c'tor an operator= are OK.
+
 protected:
     void DoSetPopupControl( wxComboPopup* popup ) override
     {
@@ -368,8 +372,7 @@ protected:
         {
             FILEDLG_HOOK_EMBED_FILE customize;
 
-            wxFileDialog openFileDialog( this, _( "Open file" ), "", "",
-                                         _( "All Files" ) + wxT( " (*.*)|*.*" ),
+            wxFileDialog openFileDialog( this, _( "Open file" ), "", "", _( "All Files" ) + wxT( " (*.*)|*.*" ),
                                          wxFD_OPEN | wxFD_FILE_MUST_EXIST );
 
             openFileDialog.SetCustomizeHook( customize );
@@ -414,8 +417,8 @@ protected:
 
 protected:
     DIALOG_SHIM*                 m_dlg;
-    SEARCH_STACK*                m_searchStack;
-    std::vector<EMBEDDED_FILES*> m_filesStack;
+    SEARCH_STACK*                m_searchStack;     // No ownership of pointer
+    std::vector<EMBEDDED_FILES*> m_filesStack;      // No ownership of pointers
 };
 
 
diff --git a/common/widgets/properties_panel.cpp b/common/widgets/properties_panel.cpp
index 0ee84808a7..170f574700 100644
--- a/common/widgets/properties_panel.cpp
+++ b/common/widgets/properties_panel.cpp
@@ -158,7 +158,7 @@ void PROPERTIES_PANEL::OnLanguageChanged( wxCommandEvent& aEvent )
         m_grid->CommitChangesFromEditor();
 
     m_grid->Clear();
-    m_displayed.clear();
+    m_displayed.clear();    // no ownership of pointers
 
     UpdateData();
 
diff --git a/common/widgets/properties_panel.h b/common/widgets/properties_panel.h
index 5759acf280..a78a487dee 100644
--- a/common/widgets/properties_panel.h
+++ b/common/widgets/properties_panel.h
@@ -108,7 +108,7 @@ public:
     int                         m_SuppressGridChangeEvents;
 
 protected:
-    std::vector<PROPERTY_BASE*> m_displayed;
+    std::vector<PROPERTY_BASE*> m_displayed;    // no ownership of pointers
     wxPropertyGrid*             m_grid;
     EDA_BASE_FRAME*             m_frame;
     wxStaticText*               m_caption;
diff --git a/common/widgets/search_pane.cpp b/common/widgets/search_pane.cpp
index f081f391af..5d0fd0a415 100644
--- a/common/widgets/search_pane.cpp
+++ b/common/widgets/search_pane.cpp
@@ -143,6 +143,11 @@ SEARCH_PANE::~SEARCH_PANE()
     m_frame->Unbind( EDA_LANG_CHANGED, &SEARCH_PANE::OnLanguageChange, this );
     Unbind( wxEVT_CHAR_HOOK, &SEARCH_PANE::OnCharHook, this );
 
+    for( SEARCH_HANDLER* handler : m_handlers )
+        delete handler;
+
+    m_handlers.clear();
+
     delete m_menu;
 }
 
diff --git a/eeschema/connection_graph.h b/eeschema/connection_graph.h
index 826f6d005d..f9ee569def 100644
--- a/eeschema/connection_graph.h
+++ b/eeschema/connection_graph.h
@@ -370,6 +370,11 @@ public:
         Reset();
     }
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    CONNECTION_GRAPH( const CONNECTION_GRAPH& ) = delete;
+    CONNECTION_GRAPH& operator=( const CONNECTION_GRAPH& ) = delete;
+
     void Reset();
 
     void SetSchematic( SCHEMATIC* aSchematic )
diff --git a/eeschema/erc/erc_settings.h b/eeschema/erc/erc_settings.h
index 3eba6cdb5b..1f286fbc42 100644
--- a/eeschema/erc/erc_settings.h
+++ b/eeschema/erc/erc_settings.h
@@ -19,8 +19,7 @@
  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _ERC_SETTINGS_H
-#define _ERC_SETTINGS_H
+#pragma once
 
 #include <erc/erc_item.h>
 #include <pin_type.h>
@@ -250,6 +249,11 @@ public:
             m_severities( 0 )
     { }
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    SHEETLIST_ERC_ITEMS_PROVIDER( const SHEETLIST_ERC_ITEMS_PROVIDER& ) = delete;
+    SHEETLIST_ERC_ITEMS_PROVIDER& operator=( const SHEETLIST_ERC_ITEMS_PROVIDER& ) = delete;
+
     void SetSeverities( int aSeverities ) override;
 
     int GetCount( int aSeverity = -1 ) const override;
@@ -265,5 +269,3 @@ private:
     void visitMarkers( std::function<void( SCH_MARKER* )> aVisitor ) const;
 };
 
-
-#endif // _ERC_SETTINGS_H
diff --git a/eeschema/sch_rule_area.h b/eeschema/sch_rule_area.h
index 3d5cbaf240..a7cfaedffd 100644
--- a/eeschema/sch_rule_area.h
+++ b/eeschema/sch_rule_area.h
@@ -137,11 +137,11 @@ protected:
     bool          m_excludedFromBoard;
     bool          m_DNP;                   ///< True if symbol is set to 'Do Not Populate'.
 
-    /// All #SCH_ITEM objects currently contained or intersecting the rule area.
+    /// All #SCH_ITEM objects currently contained or intersecting the rule area.  No ownership.
     std::unordered_set<SCH_ITEM*>            m_items;
     std::unordered_set<KIID>                 m_itemIDs;
 
-    /// All #SCH_DIRECTIVE_LABEL objectss attached to the rule area border.
+    /// All #SCH_DIRECTIVE_LABEL objects attached to the rule area border.  No ownership.
     std::unordered_set<SCH_DIRECTIVE_LABEL*> m_directives;
     std::unordered_set<KIID>                 m_directiveIDs;
 
diff --git a/eeschema/sim/sim_lib_mgr.h b/eeschema/sim/sim_lib_mgr.h
index c95a738625..7e3be7c6ac 100644
--- a/eeschema/sim/sim_lib_mgr.h
+++ b/eeschema/sim/sim_lib_mgr.h
@@ -22,8 +22,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#ifndef SIM_LIB_MGR_H
-#define SIM_LIB_MGR_H
+#pragma once
 
 #include <map>
 #include <vector>
@@ -84,12 +83,10 @@ public:
                                          REPORTER& aReporter );
 
 private:
-    std::vector<EMBEDDED_FILES*>                     m_embeddedFilesStack;
-    const PROJECT*                                   m_project;
+    std::vector<EMBEDDED_FILES*>                     m_embeddedFilesStack;  // no ownership
+    const PROJECT*                                   m_project;             // no ownership
     bool                                             m_forceFullParse;
     std::map<wxString, std::unique_ptr<SIM_LIBRARY>> m_libraries;
     std::vector<std::unique_ptr<SIM_MODEL>>          m_models;
 };
 
-
-#endif // SIM_LIB_MGR_H
diff --git a/include/libeval_compiler/libeval_compiler.h b/include/libeval_compiler/libeval_compiler.h
index ce06551c5d..905b8b5073 100644
--- a/include/libeval_compiler/libeval_compiler.h
+++ b/include/libeval_compiler/libeval_compiler.h
@@ -18,8 +18,7 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-#ifndef __LIBEVAL_COMPILER_H
-#define __LIBEVAL_COMPILER_H
+#pragma once
 
 #include <cstddef>
 #include <functional>
@@ -188,7 +187,7 @@ public:
     virtual double Convert( const wxString& aString, int unitType ) const
     {
         return 0.0;
-    };
+    }
 };
 
 
@@ -202,7 +201,7 @@ public:
             m_isDeferredDbl( false ),
             m_isDeferredStr( false ),
             m_units( EDA_UNITS::UNSCALED )
-    {};
+    {}
 
     VALUE( const wxString& aStr, bool aIsWildcard = false ) :
             m_type( VT_STRING ),
@@ -212,7 +211,7 @@ public:
             m_isDeferredDbl( false ),
             m_isDeferredStr( false ),
             m_units( EDA_UNITS::UNSCALED )
-    {};
+    {}
 
     VALUE( const double aVal ) :
             m_type( VT_NUMERIC ),
@@ -221,7 +220,7 @@ public:
             m_isDeferredDbl( false ),
             m_isDeferredStr( false ),
             m_units( EDA_UNITS::UNSCALED )
-    {};
+    {}
 
     static VALUE* MakeNullValue()
     {
@@ -230,8 +229,7 @@ public:
         return v;
     }
 
-    virtual ~VALUE()
-    {};
+    virtual ~VALUE() = default;
 
     virtual double AsDouble() const
     {
@@ -321,8 +319,10 @@ private:
 class KICOMMON_API VAR_REF
 {
 public:
-    VAR_REF() {};
-    virtual ~VAR_REF() {};
+    VAR_REF()
+    {}
+
+    virtual ~VAR_REF() = default;
 
     virtual VAR_TYPE_T GetType() const = 0;
     virtual VALUE* GetValue( CONTEXT* aCtx ) = 0;
@@ -333,8 +333,8 @@ class KICOMMON_API CONTEXT
 {
 public:
     CONTEXT() :
-        m_stack(),
-        m_stackPtr( 0 )
+            m_stack(),
+            m_stackPtr( 0 )
     {
         m_ownedValues.reserve( 20 );
     }
@@ -342,11 +342,14 @@ public:
     virtual ~CONTEXT()
     {
         for( VALUE* v : m_ownedValues )
-        {
             delete v;
-        }
     }
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    CONTEXT( const CONTEXT& ) = delete;
+    CONTEXT& operator=( const CONTEXT& ) = delete;
+
     VALUE* AllocValue()
     {
         m_ownedValues.emplace_back( new VALUE );
@@ -401,8 +404,16 @@ private:
 class KICOMMON_API UCODE
 {
 public:
+    UCODE()
+    {}
+
     virtual ~UCODE();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    UCODE( const UCODE& ) = delete;
+    UCODE& operator=( const UCODE& ) = delete;
+
     void AddOp( UOP* uop )
     {
         m_ucode.push_back(uop);
@@ -414,15 +425,14 @@ public:
     virtual std::unique_ptr<VAR_REF> CreateVarRef( const wxString& var, const wxString& field )
     {
         return nullptr;
-    };
+    }
 
     virtual FUNC_CALL_REF CreateFuncCall( const wxString& name )
     {
         return nullptr;
-    };
+    }
 
 protected:
-
     std::vector<UOP*> m_ucode;
 };
 
@@ -434,24 +444,22 @@ public:
         m_op( op ),
         m_ref(nullptr),
         m_value( std::move( value ) )
-    {};
+    {}
 
     UOP( int op, std::unique_ptr<VAR_REF> vref ) :
         m_op( op ),
         m_ref( std::move( vref ) ),
         m_value(nullptr)
-    {};
+    {}
 
     UOP( int op, FUNC_CALL_REF func, std::unique_ptr<VAR_REF> vref = nullptr ) :
         m_op( op ),
         m_func( std::move( func ) ),
         m_ref( std::move( vref ) ),
         m_value(nullptr)
-    {};
+    {}
 
-    ~UOP()
-    {
-    }
+    virtual ~UOP() = default;
 
     void Exec( CONTEXT* ctx );
 
@@ -522,6 +530,11 @@ public:
     COMPILER();
     virtual ~COMPILER();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    COMPILER( const COMPILER& ) = delete;
+    COMPILER& operator=( const COMPILER& ) = delete;
+
     /*
      * clear() should be invoked by the client if a new input string is to be processed. It
      * will reset the parser. User defined variables are retained.
@@ -596,4 +609,3 @@ protected:
 
 } // namespace LIBEVAL
 
-#endif /* LIBEVAL_COMPILER_H_ */
diff --git a/include/rc_item.h b/include/rc_item.h
index d5a3ee2a0d..d6634ddaa0 100644
--- a/include/rc_item.h
+++ b/include/rc_item.h
@@ -219,6 +219,11 @@ public:
             delete child;
     }
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    RC_TREE_NODE( const RC_TREE_NODE& ) = delete;
+    RC_TREE_NODE& operator=( const RC_TREE_NODE& ) = delete;
+
     NODE_TYPE                  m_Type;
     std::shared_ptr<RC_ITEM>   m_RcItem;
 
@@ -248,6 +253,11 @@ public:
 
     ~RC_TREE_MODEL();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    RC_TREE_MODEL( const RC_TREE_MODEL& ) = delete;
+    RC_TREE_MODEL& operator=( const RC_TREE_MODEL& ) = delete;
+
     void Update( std::shared_ptr<RC_ITEMS_PROVIDER> aProvider, int aSeverities );
 
     void ExpandAll();
diff --git a/include/settings/json_settings.h b/include/settings/json_settings.h
index 5281d9f0eb..6daee03667 100644
--- a/include/settings/json_settings.h
+++ b/include/settings/json_settings.h
@@ -78,6 +78,11 @@ public:
 
     virtual ~JSON_SETTINGS();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    JSON_SETTINGS( const JSON_SETTINGS& ) = delete;
+    JSON_SETTINGS& operator=( const JSON_SETTINGS& ) = delete;
+
     wxString GetFilename() const { return m_filename; }
 
     wxString GetFullFilename() const;
diff --git a/include/tool/action_toolbar.h b/include/tool/action_toolbar.h
index f518343cd5..b30aa7ad82 100644
--- a/include/tool/action_toolbar.h
+++ b/include/tool/action_toolbar.h
@@ -103,7 +103,7 @@ protected:
     ///< The default action to display on the toolbar item
     const TOOL_ACTION* m_defaultAction;
 
-    ///< The actions that compose the group
+    ///< The actions that compose the group.  Non-owning.
     std::vector<const TOOL_ACTION*> m_actions;
 };
 
diff --git a/include/undo_redo_container.h b/include/undo_redo_container.h
index 2560df281a..4f1ceeeeb1 100644
--- a/include/undo_redo_container.h
+++ b/include/undo_redo_container.h
@@ -292,6 +292,11 @@ public:
     UNDO_REDO_CONTAINER();
     ~UNDO_REDO_CONTAINER();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    UNDO_REDO_CONTAINER( const UNDO_REDO_CONTAINER& ) = delete;
+    UNDO_REDO_CONTAINER& operator=( const UNDO_REDO_CONTAINER& ) = delete;
+
     void PushCommand( PICKED_ITEMS_LIST* aCommand );
 
     PICKED_ITEMS_LIST* PopCommand();
diff --git a/include/view/view.h b/include/view/view.h
index d3d437530a..3841bad27f 100644
--- a/include/view/view.h
+++ b/include/view/view.h
@@ -24,8 +24,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#ifndef __VIEW_H
-#define __VIEW_H
+#pragma once
 
 #include <gal/gal.h>
 #include <vector>
@@ -73,6 +72,11 @@ public:
     VIEW();
     virtual ~VIEW();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    VIEW( const VIEW& ) = delete;
+    VIEW& operator=( const VIEW& ) = delete;
+
     /**
      * Nasty hack, invoked by the destructor of VIEW_ITEM to auto-remove the item
      * from the owning VIEW if there is any.
@@ -768,10 +772,6 @@ protected:
         }
     };
 
-
-
-    VIEW( const VIEW& ) = delete;
-
     /// Redraw contents within rectangle \a aRect.
     void redrawRect( const BOX2I& aRect );
 
@@ -856,7 +856,7 @@ protected:
     struct UPDATE_DEPTH_VISITOR;
 
     std::unique_ptr<KIGFX::VIEW_GROUP> m_preview;
-    std::vector<VIEW_ITEM *>            m_ownedItems;
+    std::vector<VIEW_ITEM*>            m_ownedItems;
 
     /// Whether to use rendering order modifier or not.
     bool                               m_enableOrderModifier;
@@ -904,4 +904,3 @@ protected:
 };
 } // namespace KIGFX
 
-#endif
diff --git a/include/view/view_group.h b/include/view/view_group.h
index 61dd1a2b1d..c234d73fe8 100644
--- a/include/view/view_group.h
+++ b/include/view/view_group.h
@@ -25,12 +25,7 @@
  *
  */
 
-/**
- * @file view_group.h
- */
-
-#ifndef VIEW_GROUP_H_
-#define VIEW_GROUP_H_
+#pragma once
 
 #include <gal/gal.h>
 #include <view/view_item.h>
@@ -50,6 +45,11 @@ public:
     VIEW_GROUP( VIEW* aView = nullptr );
     virtual ~VIEW_GROUP();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    VIEW_GROUP( const VIEW_GROUP& ) = delete;
+    VIEW_GROUP& operator=( const VIEW_GROUP& ) = delete;
+
     wxString GetClass() const override;
 
     /**
@@ -108,9 +108,7 @@ protected:
 
 protected:
     int                     m_layer;
-    std::vector<VIEW_ITEM*> m_groupItems;
+    std::vector<VIEW_ITEM*> m_groupItems;       // No ownership.
 };
 
 } // namespace KIGFX
-
-#endif // VIEW_GROUP_H_
diff --git a/include/view/view_overlay.h b/include/view/view_overlay.h
index fdfc220f6e..1310847057 100644
--- a/include/view/view_overlay.h
+++ b/include/view/view_overlay.h
@@ -24,12 +24,10 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
 
-#ifndef __VIEW_OVERLAY_H
-#define __VIEW_OVERLAY_H
+#pragma once
 
 #include <gal/gal.h>
 #include <view/view_item.h>
-
 #include <vector>
 #include <deque>
 
@@ -48,6 +46,11 @@ public:
     VIEW_OVERLAY();
     virtual ~VIEW_OVERLAY();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    VIEW_OVERLAY( const VIEW_OVERLAY& ) = delete;
+    VIEW_OVERLAY& operator=( const VIEW_OVERLAY& ) = delete;
+
     wxString GetClass() const override;
 
     struct COMMAND;
@@ -109,13 +112,11 @@ public:
 private:
     void releaseCommands();
 
-    COLOR4D m_strokeColor;
-    COLOR4D m_fillColor;
-
+private:
+    COLOR4D               m_strokeColor;
+    COLOR4D               m_fillColor;
     std::vector<COMMAND*> m_commands;
 };
 
 } // namespace KIGFX
 
-
-#endif
diff --git a/include/widgets/grid_text_button_helpers.h b/include/widgets/grid_text_button_helpers.h
index 24032b7642..8ffec42a57 100644
--- a/include/widgets/grid_text_button_helpers.h
+++ b/include/widgets/grid_text_button_helpers.h
@@ -135,8 +135,8 @@ public:
 
 protected:
     DIALOG_SHIM*                 m_dlg;
-    SEARCH_STACK*                m_searchStack;
-    std::vector<EMBEDDED_FILES*> m_filesStack;
+    SEARCH_STACK*                m_searchStack;     // No ownership.
+    std::vector<EMBEDDED_FILES*> m_filesStack;      // No ownership.
 };
 
 
diff --git a/include/widgets/search_pane.h b/include/widgets/search_pane.h
index 9d0687dd43..8853a449c2 100644
--- a/include/widgets/search_pane.h
+++ b/include/widgets/search_pane.h
@@ -68,6 +68,11 @@ public:
     SEARCH_PANE( EDA_DRAW_FRAME* aFrame );
     virtual ~SEARCH_PANE();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    SEARCH_PANE( const SEARCH_PANE& ) = delete;
+    SEARCH_PANE& operator=( const SEARCH_PANE& ) = delete;
+
     void AddSearcher( SEARCH_HANDLER* aHandler );
     void OnSearchTextEntry( wxCommandEvent& aEvent ) override;
     void OnNotebookPageChanged( wxBookCtrlEvent& aEvent ) override;
@@ -84,8 +89,8 @@ protected:
     void             OnClosed( wxAuiManagerEvent& aEvent );
 
 private:
-    std::vector<SEARCH_HANDLER*>  m_handlers;
-    std::vector<SEARCH_PANE_TAB*> m_tabs;
+    std::vector<SEARCH_HANDLER*>  m_handlers;       // We own these.
+    std::vector<SEARCH_PANE_TAB*> m_tabs;           // No ownership.
     wxString                      m_lastQuery;
     EDA_DRAW_FRAME*               m_frame;
     ACTION_MENU*                  m_menu;
diff --git a/pcbnew/drc/drc_engine.h b/pcbnew/drc/drc_engine.h
index e9eda5a9d3..d9069fe09a 100644
--- a/pcbnew/drc/drc_engine.h
+++ b/pcbnew/drc/drc_engine.h
@@ -91,6 +91,11 @@ public:
     DRC_ENGINE( BOARD* aBoard = nullptr, BOARD_DESIGN_SETTINGS* aSettings = nullptr );
     virtual ~DRC_ENGINE();
 
+    // We own several lists of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    DRC_ENGINE( const DRC_ENGINE& ) = delete;
+    DRC_ENGINE& operator=( const DRC_ENGINE& ) = delete;
+
     void SetBoard( BOARD* aBoard ) { m_board = aBoard; }
     BOARD* GetBoard() const { return m_board; }
 
diff --git a/pcbnew/drc/drc_item.h b/pcbnew/drc/drc_item.h
index ca116b398e..45b4148939 100644
--- a/pcbnew/drc/drc_item.h
+++ b/pcbnew/drc/drc_item.h
@@ -278,6 +278,11 @@ public:
             m_markerTypes.push_back( otherMarkerType );
     }
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    DRC_ITEMS_PROVIDER( const DRC_ITEMS_PROVIDER& ) = delete;
+    DRC_ITEMS_PROVIDER& operator=( const DRC_ITEMS_PROVIDER& ) = delete;
+
     void SetSeverities( int aSeverities ) override;
 
     int GetCount( int aSeverity = -1 ) const override;
diff --git a/pcbnew/pcb_table.h b/pcbnew/pcb_table.h
index 8228d9cab2..2b4dcb4a21 100644
--- a/pcbnew/pcb_table.h
+++ b/pcbnew/pcb_table.h
@@ -39,6 +39,9 @@ public:
 
     ~PCB_TABLE();
 
+    // If implemented, would need to copy m_cells list.
+    PCB_TABLE& operator=( const PCB_TABLE& ) = delete;
+
     static inline bool ClassOf( const EDA_ITEM* aItem )
     {
         return aItem && PCB_TABLE_T == aItem->Type();
diff --git a/pcbnew/widgets/appearance_controls.h b/pcbnew/widgets/appearance_controls.h
index df329c5df0..31ea96502e 100644
--- a/pcbnew/widgets/appearance_controls.h
+++ b/pcbnew/widgets/appearance_controls.h
@@ -202,6 +202,11 @@ public:
     APPEARANCE_CONTROLS( PCB_BASE_FRAME* aParent, wxWindow* aFocusOwner, bool aFpEditor = false );
     ~APPEARANCE_CONTROLS();
 
+    // We own at least one list of raw pointers.  Don't let the compiler fill in copy c'tors that
+    // will only land us in trouble.
+    APPEARANCE_CONTROLS( const APPEARANCE_CONTROLS& ) = delete;
+    APPEARANCE_CONTROLS& operator=( const APPEARANCE_CONTROLS& ) = delete;
+
     wxSize GetBestSize() const;
 
     ///< Update the panel contents from the application and board models.