The object is not be editable in the inspector.

	// Create a plane and dont let it be modificable in the Inspector
	// nor in the Sceneview.
	function Start() {
		var createdGO : GameObject = GameObject.CreatePrimitive(PrimitiveType.Plane);
		createdGO.hideFlags = HideFlags.NotEditable;
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Start() {
        GameObject createdGO = GameObject.CreatePrimitive(PrimitiveType.Plane);
        createdGO.hideFlags = HideFlags.NotEditable;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Start() as void:
		createdGO as GameObject = GameObject.CreatePrimitive(PrimitiveType.Plane)
		createdGO.hideFlags = HideFlags.NotEditable