To make it a little clearer...Once you buy something from Itunes, it is yours to keep forever. The trick is backing up onto your itunes library. Once you put it on your Itouch, it is only on there, then when you back up on your computer, everything is on there as well. So say, she buys Beauty and the Beast and watches it on her Itouch, then she wants to buy Cinderella, if she doesn't have room on the itouch to hold both movies, she can delete the movie from her Itouch (It is now on the computer backed up), and she can keep Cinderella on her Itouch. Next time she backs up, she will now have both movies on the computer and if need be, can delete them from her Itouch to make room for more. It is the same premise for songs. Also, if you have an Itouch, Iphone, Ipad, Mac computer, you can access everything you paid for on itunes from any of those devices. So if you went on your Ipad, and clicked on Itunes and tried to watch Cinderella on there, you would go onto Itunes and click on purchase for the movie, once you click on that, it will say that you've already purchased this item, and you will not have to pay again. Hope this helps you understand a bit better.