about design pattern that is only use internal test for my company product

hi i am using the following code from msdn for internal use for my company:

using System;

public sealed class Singleton
{
   private static volatile Singleton instance;
   private static object syncRoot = new Object();

   private Singleton() {}

   public static Singleton Instance
   {
      get 
      {
         if (instance == null) 
         {
            lock (syncRoot) 
            {
               if (instance == null) 
                  instance = new Singleton();
            }
         }

         return instance;
      }
   }
}

i wonder if this is illegal or i have to get any permission or license from Microsoft in order to use that. it is just a singleton pattern.the other one is page object pattern that is use for automation that i search online