diff --git a/src/java/com/threerings/stage/data/StageCodes.java b/src/java/com/threerings/stage/data/StageCodes.java
index fcb1254b..211ef94a 100644
--- a/src/java/com/threerings/stage/data/StageCodes.java
+++ b/src/java/com/threerings/stage/data/StageCodes.java
@@ -24,6 +24,7 @@ package com.threerings.stage.data;
 import com.threerings.util.MessageBundle;
 
 import com.threerings.presents.data.InvocationCodes;
+import com.threerings.presents.data.Permission;
 
 import com.threerings.crowd.data.BodyObject;
 
@@ -38,13 +39,11 @@ public interface StageCodes extends InvocationCodes
     /** The resource set that contains our tileset bundles. */
     public static final String TILESET_RSRC_SET = "tilesets";
 
-    /** The access control identifier for scene modification privileges.
-     * See {@link BodyObject#checkAccess}. */
-    public static final String MODIFY_SCENE_ACCESS = "stage.modify_scene";
+    /** The access control identifier for scene modification privileges. */
+    public static final Permission MODIFY_SCENE_ACCESS = new Permission();
 
-    /** The access control identifier for potentially damaging scene
-     * modification privileges. See {@link BodyObject#checkAccess}. */
-    public static final String MUTILATE_SCENE_ACCESS = "stage.mutilate_scene";
+    /** The access control identifier for potentially damaging scene modification privileges. */
+    public static final Permission MUTILATE_SCENE_ACCESS = new Permission();
 
     /** An error delivered when adding objects to scenes. */
     public static final String ERR_NO_OVERLAP = MessageBundle.qualify(
diff --git a/src/java/com/threerings/stage/server/StageSceneManager.java b/src/java/com/threerings/stage/server/StageSceneManager.java
index b0e0e5b3..71c4868a 100644
--- a/src/java/com/threerings/stage/server/StageSceneManager.java
+++ b/src/java/com/threerings/stage/server/StageSceneManager.java
@@ -176,11 +176,7 @@ public class StageSceneManager extends SpotSceneManager
                            StageSceneService.ConfirmListener listener)
         throws InvocationException
     {
-        BodyObject user = (BodyObject)caller;
-        String err = user.checkAccess(StageCodes.MODIFY_SCENE_ACCESS, _sscene);
-        if (err != null) {
-            throw new InvocationException(err);
-        }
+        InvocationException.requireAccess(caller, StageCodes.MODIFY_SCENE_ACCESS, _sscene);
 
         if (addObject(info, false, true)) {
             listener.requestProcessed();
@@ -194,11 +190,7 @@ public class StageSceneManager extends SpotSceneManager
                                StageSceneService.ConfirmListener listener)
         throws InvocationException
     {
-        BodyObject user = (BodyObject)caller;
-        String err = user.checkAccess(StageCodes.MODIFY_SCENE_ACCESS, _sscene);
-        if (err != null) {
-            throw new InvocationException(err);
-        }
+        InvocationException.requireAccess(caller, StageCodes.MODIFY_SCENE_ACCESS, _sscene);
         
         // create our scene update which will be stored in the database
         // and used to efficiently update clients