if a NPC is owned, allow access if ownerID matchs parcel owner or it is in the access list. option OS_NPC_OBJECT_GROUP it still needed if access is by group (this option should also work with not owned NPC) NEEDS TESTING, may prove to be a bad solution

OpenSim/Region/CoreModules/World/Land/LandObject.cs

@@ -694,7 +694,30 @@ namespace OpenSim.Region.CoreModules.World.Land
             if (HasGroupAccess(avatar))
                 return false;
 
-            return !IsInLandAccessList(avatar);
+            if(IsInLandAccessList(avatar))
+                return false;
+
+            // check for a NPC
+            ScenePresence sp;
+            if (!m_scene.TryGetScenePresence(avatar, out sp))
+                return true;
+
+            if(sp==null || !sp.isNPC)
+                return true;
+            
+            INPC npccli = (INPC)sp.ControllingClient;
+            if(npccli== null)
+                return true;
+            
+            UUID owner = npccli.Owner;
+
+            if(owner == UUID.Zero)
+                return true;
+
+            if (owner == LandData.OwnerID)
+                return false;
+
+            return !IsInLandAccessList(owner);
         }
 
         public bool IsInLandAccessList(UUID avatar)

OpenSim/Region/Framework/Interfaces/INPCModule.cs

@@ -57,6 +57,7 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </summary>
         bool SenseAsAgent { get; }
         UUID ActiveGroupId { get; set; }
+        UUID Owner { get; }
     }
 
     public interface INPCModule

OpenSim/Region/OptionalModules/World/NPC/NPCAvatar.cs

@@ -43,6 +43,10 @@ namespace OpenSim.Region.OptionalModules.World.NPC
     public class NPCAvatar : IClientAPI, INPC
     {
         public bool SenseAsAgent { get; set; }
+        public UUID Owner
+        {
+            get { return m_ownerID;}
+        }
 
         public delegate void ChatToNPC(
             string message, byte type, Vector3 fromPos, string fromName,