If you are talking about Warcraft 3 that is another story.  You actually combined 2 games into one name in your title so it unclear if you are working on World of Warcraft or Warcraft III.  Warcraft III will require to have the licenses.  As already stated though if you have 10 copies and 10 computers you do not require license managment for that either.  Just install onto your computers making sure they each have unique cd keys.