You need to check any contract you might be under with the University. If your code was developed on university time with university resources it probably doesn't belong to you! If you open source personal code then add it to the University code base you may be creating a problem if the code will ever be sold. Sadly you need to realize that todays market doesn't automatically assign ownership rights to your code even though you created it. In most cases ownership will be governed by any contracts or license restrictions you might be working under. Study everything very carefully!