diff --git a/SchematicSystem_Core/src/de/steamwar/schematicsystem/SafeSchematicNode.java b/SchematicSystem_Core/src/de/steamwar/schematicsystem/SafeSchematicNode.java
new file mode 100644
index 0000000..25a5711
--- /dev/null
+++ b/SchematicSystem_Core/src/de/steamwar/schematicsystem/SafeSchematicNode.java
@@ -0,0 +1,117 @@
+/*
+    This file is a part of the SteamWar software.
+
+    Copyright (C) 2020  SteamWar.de-Serverteam
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package de.steamwar.schematicsystem;
+
+import de.steamwar.sql.SchematicNode;
+import de.steamwar.sql.SteamwarUser;
+import lombok.AllArgsConstructor;
+import lombok.NonNull;
+import org.bukkit.entity.Player;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class SafeSchematicNode {
+
+    public static Result setParent(@NonNull SteamwarUser user, @NonNull SchematicNode node, SchematicNode newParent) {
+        if(user.getId() != node.getId()) {
+            return Result.NOT_OWNER;
+        }
+        if(newParent == null) {
+            if(SchematicNode.getSchematicsAccessibleByUser(user.getId(), 0)
+                    .stream().map(SchematicNode::getName).anyMatch(s -> s.equalsIgnoreCase(node.getName()))) {
+                return Result.ALREADY_IN_DIRECTORY;
+            }
+
+            node.setParent(0);
+        } else {
+            if(!newParent.isDir()) {
+                return Result.NOT_A_DIR;
+            }
+
+            if(SchematicNode.getSchematicsAccessibleByUser(user.getId(), newParent.getParent())
+                    .stream().map(SchematicNode::getName).anyMatch(s -> s.equalsIgnoreCase(node.getName()))) {
+                return Result.ALREADY_IN_DIRECTORY;
+            }
+
+            node.setParent(newParent.getId());
+        }
+        return Result.DONE;
+    }
+
+    public static Result setName(@NonNull SteamwarUser user, @NonNull SchematicNode node, @NonNull String name) {
+        if(user.getId() != node.getId()) {
+            return Result.NOT_OWNER;
+        }
+
+        if(invalidSchemName(name)) {
+            return Result.INVALID_NAME;
+        }
+
+        if(SchematicNode.getSchematicsAccessibleByUser(user.getId(), node.getParent()).stream().map(SchematicNode::getName).anyMatch(s -> s.equalsIgnoreCase(name))) {
+            return Result.ALREADY_IN_DIRECTORY;
+        }
+
+        node.setName(name);
+        return Result.DONE;
+    }
+
+    private static final List<String> FORBIDDEN_NAMES = Collections.unmodifiableList(Arrays.asList("public"));
+    public static boolean invalidSchemName(String name) {
+        if (name.isEmpty()) {
+            return true;
+        }
+        if(name.length() > 64) {
+            return true;
+        }
+        if (name.contains("/") ||
+                name.contains("\\") ||
+                name.contains("<") ||
+                name.contains(">") ||
+                name.contains("^") ||
+                name.contains("°") ||
+                name.contains("'") ||
+                name.contains("\"") ||
+                name.contains(" ")) {
+            return true;
+        }
+        return FORBIDDEN_NAMES.contains(name.toLowerCase());
+    }
+
+    @AllArgsConstructor
+    public enum Result {
+        DONE("No"),
+        NOT_A_DIR(SchematicSystem.PREFIX + "§cDie ausgewählte Schematic ist kein Ordner"),
+        ALREADY_IN_DIRECTORY(SchematicSystem.PREFIX + "§cDie Schematic gibt es bereits in diesem Ordner"),
+        INVALID_NAME(SchematicSystem.PREFIX + "§cDieser Name ist unzulässig"),
+        NOT_OWNER(SchematicSystem.PREFIX + "§cDu bist nicht der Besitzer dieser Schematic");
+
+        private String errorMessage;
+
+        public void sendError(Player player) {
+            player.sendMessage(errorMessage);
+        }
+
+        public boolean isSuccessful() {
+            return this == DONE;
+        }
+    }
+}
diff --git a/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/GUI.java b/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/GUI.java
index ea47d1b..fbabed5 100644
--- a/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/GUI.java
+++ b/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/GUI.java
@@ -20,6 +20,7 @@
 package de.steamwar.schematicsystem.commands;
 
 import de.steamwar.inventory.*;
+import de.steamwar.schematicsystem.SafeSchematicNode;
 import de.steamwar.schematicsystem.SchematicSystem;
 import de.steamwar.sql.*;
 import org.bukkit.Material;
@@ -102,8 +103,12 @@ public class GUI {
             inv.setItem(5, skull);
             inv.setItem(6, Material.ARROW, "§eVerschieben", clickType -> {
                 SchematicSelector selector = new SchematicSelector(player, SchematicSelector.selectDirectory(), npar -> {
-                    node.setParent(npar==null?null:npar.getId());
-                    info(player, SchematicNode.getSchematicNode(node.getId()));
+                    SafeSchematicNode.Result result = SafeSchematicNode.setParent(user, node, npar);
+                    if(result.isSuccessful()) {
+                        info(player, SchematicNode.getSchematicNode(node.getId()));
+                    } else {
+                        result.sendError(player);
+                    }
                 });
                 selector.open();
             });
@@ -112,10 +117,12 @@ public class GUI {
                 SWAnvilInv anvilInv = new SWAnvilInv(player, node.getName() + " umbenennen", node.getName());
                 anvilInv.setItem(finalMat);
                 anvilInv.setCallback(s -> {
-                    if (!invalidSchemName(player, new String[]{s})) {
-                        node.setName(s);
+                    SafeSchematicNode.Result result = SafeSchematicNode.setName(user, node, s);
+                    if(result.isSuccessful()) {
+                        info(player, node);
+                    } else {
+                        result.sendError(player);
                     }
-                    info(player, node);
                 });
                 anvilInv.open();
             });
diff --git a/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/SchematicCommand.java b/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/SchematicCommand.java
index 14578b4..d7350ae 100644
--- a/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/SchematicCommand.java
+++ b/SchematicSystem_Core/src/de/steamwar/schematicsystem/commands/SchematicCommand.java
@@ -24,6 +24,7 @@ import de.steamwar.command.SWCommandUtils;
 import de.steamwar.command.TypeMapper;
 import de.steamwar.inventory.SWAnvilInv;
 import de.steamwar.inventory.SchematicSelector;
+import de.steamwar.schematicsystem.SafeSchematicNode;
 import de.steamwar.providers.BauServerInfo;
 import de.steamwar.schematicsystem.SchematicSystem;
 import de.steamwar.sql.*;
@@ -424,7 +425,11 @@ public class SchematicCommand extends SWCommand {
                 player.sendMessage(SchematicSystem.PREFIX + "§cDas gibt nur Fehler, vertrau mir.");
                 return;
             }
-            node.setParent(newNode.getId());
+            SafeSchematicNode.Result result = SafeSchematicNode.setParent(user, node, newNode);
+            if(!result.isSuccessful()) {
+                result.sendError(player);
+                return;
+            }
         }
         player.sendMessage(SchematicSystem.PREFIX + "§7Die Schematic ist nun unter §e" + node.generateBreadcrumbs(user) + " §7zu finden");
     }
@@ -439,7 +444,11 @@ public class SchematicCommand extends SWCommand {
         if (invalidSchemName(player, new String[]{name})) {
             return;
         }
-        node.setName(name);
+        SafeSchematicNode.Result result = SafeSchematicNode.setName(user, node, name);
+        if(!result.isSuccessful()) {
+            result.sendError(player);
+            return;
+        }
         player.sendMessage(SchematicSystem.PREFIX + "§7Die Schematic heist nun §e" + node.generateBreadcrumbs(user));
     }
 
diff --git a/pom.xml b/pom.xml
index b1a8c5c..cc39eaa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -45,5 +45,10 @@
             <scope>system</scope>
             <systemPath>${main.basedir}/lib/SpigotCore.jar</systemPath>
         </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.22</version>
+        </dependency>
     </dependencies>
 </project>
\ No newline at end of file