diff --git a/src/com/jpexs/decompiler/flash/gui/MainPanel.java b/src/com/jpexs/decompiler/flash/gui/MainPanel.java
index f041a166e..a7eac7550 100644
--- a/src/com/jpexs/decompiler/flash/gui/MainPanel.java
+++ b/src/com/jpexs/decompiler/flash/gui/MainPanel.java
@@ -469,6 +469,14 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
                 return;
             }
             TreeItem item = (TreeItem) paths[0].getLastPathComponent();
+            
+            if (item instanceof Tag) {
+                if (((Tag)item).isReadOnly()) {
+                    return;
+                }                
+            }
+            
+            
             if (e.getKeyCode() == KeyEvent.VK_UP) {
                 contextPopupMenu.moveUpDown(item, true);
             }
@@ -564,6 +572,14 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
                     tagItems.add((Tag) item);
                 }
             }
+            boolean allWritable = true;
+            for (TreeItem item:tagItems) {
+                if (((Tag)item).isReadOnly()) {
+                    allWritable = false;
+                    break;
+                }
+            }
+            
             if (e.getKeyCode() == 'C') {
                 if (e.isShiftDown()) {
                     contextPopupMenu.copyTagToClipboardWithDependenciesActionPerformed(null, tagItems);
@@ -571,7 +587,7 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
                     contextPopupMenu.copyTagToClipboardActionPerformed(null, tagItems);
                 }
             }
-            if (e.getKeyCode() == 'X') {
+            if (e.getKeyCode() == 'X' && allWritable) {
                 contextPopupMenu.update(tagItems);
                 if (e.isShiftDown()) {
                     contextPopupMenu.cutTagToClipboardWithDependenciesActionPerformed(null);
diff --git a/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java b/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
index a5e36cc8c..0111ff429 100644
--- a/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
+++ b/src/com/jpexs/decompiler/flash/gui/tagtree/TagTreeContextMenu.java
@@ -626,8 +626,23 @@ public class TagTreeContextMenu extends JPopupMenu {
 
     public boolean canRemove(final List<TreeItem> items) {
         for (TreeItem item : items) {
-            if (!(item instanceof Tag) && !(item instanceof Frame)) {
+            if (item instanceof Tag)
+            {
+                if (((Tag)item).isReadOnly()) {
+                    return false;
+                }
+            } else if (item instanceof Frame) {
+                Frame frame = (Frame) item;
+                if (frame.timeline.timelined instanceof DefineSpriteTag) {
+                    if (((Tag)frame.timeline.timelined).isReadOnly()) {
+                        return false;
+                    }
+                }
+            } else {
                 if (item instanceof TagScript) {
+                    if (((TagScript)item).getTag().isReadOnly()) {
+                        return false;
+                    }
                     continue;
                 }