diff --git a/EXE_GdbPartLayers.cpp b/EXE_GdbPartLayers.cpp
index 25a66fe..e136caa 100644
--- a/EXE_GdbPartLayers.cpp
+++ b/EXE_GdbPartLayers.cpp
@@ -773,6 +773,77 @@ ExeDuploGetModified( int nSouId, bool& bModif)
    return true ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+ExeDuploSetLocked( int nDupId)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // Verifico sia un duplo
+   if ( ! ExeIsDuplo( nDupId))
+      return false ;
+  // Imposto il flag di bloccato
+   return pGeomDB->SetInfo( nDupId, GDB_SI_DUPLOCKED, true) ;
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExeDuploResetLocked( int nDupId)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // Verifico sia nel gruppo base dei duplicati
+   int nDuploBaseId = GetDuploBase( pGeomDB) ;
+   if ( nDuploBaseId == GDB_ID_NULL  ||  pGeomDB->GetParentId( nDupId) != nDuploBaseId)
+      return false ;
+  // Verifico abbia un sorgente
+   int nOrigId ;
+   if ( ! pGeomDB->GetInfo( nDupId, GDB_SI_DUPSOU, nOrigId)  ||  pGeomDB->GetGdbType( nOrigId) != GDB_TY_GROUP)
+      return false ;
+  // Verifico bloccaggio
+   bool bLocked ;
+   if ( ! pGeomDB->GetInfo( nDupId, GDB_SI_DUPLOCKED, bLocked))
+      bLocked = false ;
+   pGeomDB->RemoveInfo( nDupId, GDB_SI_DUPLOCKED) ;
+   if ( ! bLocked)
+      return true ;
+  // Verifico necessità di aggiornamento
+   bool bToUpdate ;
+   if ( ! pGeomDB->GetInfo( nDupId, GDB_SI_DUPTOUPDATE, bToUpdate))
+      bToUpdate = false ;
+   pGeomDB->RemoveInfo( nDupId, GDB_SI_DUPTOUPDATE) ;
+   if ( ! bToUpdate)
+      return true ;
+  // Eseguo aggiornamento
+   pGeomDB->Erase( nDupId) ;
+   int nNewId = pGeomDB->Copy( nOrigId, nDupId, nDuploBaseId) ;
+   if ( nNewId == GDB_ID_NULL)
+      return false ;
+   int nBaseId ;
+   if ( pGeomDB->GetInfo( nOrigId, GDB_SI_BASE, nBaseId)  &&
+        pGeomDB->GetGdbType( nBaseId) == GDB_TY_GROUP)
+      *pGeomDB->GetGroupFrame( nNewId) = *pGeomDB->GetGroupFrame( nBaseId) ;
+   pGeomDB->SetInfo( nNewId, GDB_SI_DUPSOU, nOrigId) ;
+   pGeomDB->RemoveInfo( nNewId, GDB_SI_DUPLIST) ;
+   pGeomDB->RemoveInfo( nNewId, GDB_SI_DUPMODIF) ;
+   return true ;
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExeDuploGetLocked( int nDupId, bool& bLocked)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // Verifico sia un duplo
+   if ( ! ExeIsDuplo( nDupId))
+      return false ;
+  // Recupero il flag di bloccato
+   if ( ! pGeomDB->GetInfo( nDupId, GDB_SI_DUPLOCKED, bLocked))
+      bLocked = false ;
+   return true ;
+}
+
 //-----------------------------------------------------------------------------
 bool
 ExeDuploUpdate( int nSouId)
@@ -804,6 +875,13 @@ ExeDuploUpdate( int nSouId)
       return false ;
   // eseguo gli aggiornamenti
    for ( int nCopyId : vnRef) {
+     // se bloccato, non eseguo aggiornamento
+      bool bLocked ;
+      if ( pGeomDB->GetInfo( nCopyId, GDB_SI_DUPLOCKED, bLocked)  &&  bLocked) {
+         pGeomDB->SetInfo( nCopyId, GDB_SI_DUPTOUPDATE, true) ;
+         continue ;
+      }
+     // aggiorno
       pGeomDB->Erase( nCopyId) ;
       int nNewId = pGeomDB->Copy( nSouId, nCopyId, nDuploBaseId) ;
       if ( nNewId == GDB_ID_NULL) {
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 263c824..a664d90 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbPartLayers.cpp b/LUA_GdbPartLayers.cpp
index 1ca47e4..dcdea8e 100644
--- a/LUA_GdbPartLayers.cpp
+++ b/LUA_GdbPartLayers.cpp
@@ -488,6 +488,55 @@ LuaDuploGetModified( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaDuploSetLocked( lua_State* L)
+{
+  // 1 parametro : nDupId
+   int nDupId ;
+   LuaCheckParam( L, 1, nDupId)
+   LuaClearStack( L) ;
+  // blocco il duplicato (non modificabile)
+   bool bOk = ExeDuploSetLocked( nDupId) ;
+  // restituisco il risultato
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
+//-------------------------------------------------------------------------------
+static int
+LuaDuploResetLocked( lua_State* L)
+{
+  // 1 parametro : nDupId
+   int nDupId ;
+   LuaCheckParam( L, 1, nDupId)
+   LuaClearStack( L) ;
+  // sblocco il duplicato (ritorna copia esatta dell'originale)
+   bool bOk = ExeDuploResetLocked( nDupId) ;
+  // restituisco il risultato
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
+//-------------------------------------------------------------------------------
+static int
+LuaDuploGetLocked( lua_State* L)
+{
+  // 1 parametro : nDupId
+   int nDupId ;
+   LuaCheckParam( L, 1, nDupId)
+   LuaClearStack( L) ;
+  // recupero lo stato di blocco del duplicato
+   bool bLocked ;
+   bool bOk = ExeDuploGetLocked( nDupId, bLocked) ;
+  // restituisco il risultato
+   if ( bOk)
+      LuaSetParam( L, bLocked) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 static int
 LuaDuploUpdate( lua_State* L)
@@ -569,6 +618,9 @@ LuaInstallGdbPartLayer( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtDuploList", LuaDuploList) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtDuploSetModified", LuaDuploSetModified) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtDuploGetModified", LuaDuploGetModified) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtDuploSetLocked", LuaDuploSetLocked) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtDuploResetLocked", LuaDuploResetLocked) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtDuploGetLocked", LuaDuploGetLocked) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtDuploUpdate", LuaDuploUpdate) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtIsDuplo", LuaIsDuplo) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtDuploGetOriginal", LuaDuploGetOriginal) ;