When you see a program such as Snow Leopard or Iworks, etc.for a Mac it basically says personal use, family use, or unlimited (or words to that affect). What does that really mean? In other words if a friend of mine bought Iworks with his new Mac could I download it onto my computer? Also I know that there are "piracy" issues but am wondering can it be done. Also with the discs that come with a new Mac it is my understanding that if for some reason you were to "lose" your programs that those discs would re-install the programs on your computer, but I see them for sale all over Ebay which leads me to believe that they can be re-used again and again. What exactly is the story?